Random Quiz On Material Testing!

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1. What kind of paint that has a reflectance or beads? 

Explanation

Reflectorized paint is a type of paint that contains reflective materials or beads. These reflective materials or beads help to increase visibility and reflect light, making it ideal for applications such as road markings, signs, and safety equipment. The reflectorized paint is designed to enhance visibility during low light conditions or at night, improving safety for drivers and pedestrians.

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2. 19. What is the machine used for abrasion test? 

Explanation

The correct answer is Los Angeles Abrasion Machine. This machine is used to perform the Los Angeles abrasion test, which measures the resistance of aggregates to abrasion. It simulates the wearing action of vehicles on road surfaces and helps evaluate the durability and quality of aggregates used in construction.

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3. Heavy rains occur the night before prior to your scheduled field density test, areyou going to pursue your schedule? Why? 

Explanation

Heavy rains increase the moisture content of the soil, which can significantly affect the results of a field density test. The moisture content plays a crucial role in determining the density and compaction of the soil. If the moisture content is high, it can lead to a decrease in compaction and density, resulting in inaccurate test results. Therefore, it is not advisable to pursue the scheduled field density test after heavy rains.

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4. What is the use of blown asphalt? 

Explanation

Blown asphalt is used as a joint filler and water proofing material. It is commonly used in construction projects to fill gaps and joints between different surfaces, providing a tight seal and preventing water leakage. Additionally, blown asphalt can also act as a water proofing agent, effectively protecting structures from water damage.

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5. What is Item 311 of the DPWH Specification (Blue Book)? 

Explanation

Item 311 of the DPWH Specification (Blue Book) refers to Portland Cement Concrete Pavement. This means that it is a specific item or section within the DPWH Specification that pertains to the construction and specifications of Portland Cement Concrete Pavement. It provides guidelines and requirements for the proper installation and quality control of this type of pavement.

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6. How to determine the degree of compaction of Items 104, 200, & 201? 

Explanation

The degree of compaction of Items 104, 200, & 201 can be determined by conducting a Field Density Test. This test involves measuring the in-place density of the soil or material using various methods such as sand replacement, nuclear density gauge, or drive cylinder. The test provides information about the level of compaction achieved, which is crucial for ensuring the stability and performance of the construction project. The Field Density Test is commonly used in civil engineering and construction to assess the quality of compaction and make necessary adjustments if required.

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7. As a Materials Engineer, how can you determine that the sample placed in theoven is already oven – dried? 

Explanation

When a sample is placed in an oven to be dried, it contains moisture which evaporates as it is heated. The drying process continues until all the moisture is removed from the sample, and the sample reaches its constant weight. This means that no further weight loss is observed, indicating that all the moisture has been evaporated. Therefore, reaching the constant weight is a reliable indicator that the sample is already oven-dried.

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8. How many samples should be taken for every 75 cu.m fresh concrete?

Explanation

For every 75 cu.m of fresh concrete, 1 set consisting of 3-pcs sample should be taken. This means that a total of 3 samples should be taken for every 75 cu.m of fresh concrete.

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9. For 15, 000 kgs RSB, how many samples shall be submitted for Quality Test? 

Explanation

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10. For how long or how many hours shall a bituminous prime coat be leftundisturbed? 

Explanation

A bituminous prime coat should be left undisturbed for 24 hours. This allows the prime coat to fully cure and bond with the underlying surface, ensuring proper adhesion and durability of the subsequent layers. Waiting for this period also helps prevent any damage or displacement of the prime coat, which could affect the overall quality of the pavement.

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11. What is the sample for compressive strength determination of a structuralconcrete?

Explanation

The compressive strength of structural concrete is determined by testing concrete cylinder samples. These cylindrical samples are typically cast and cured under controlled conditions to represent the concrete used in the structure. The samples are then subjected to compression testing to measure their resistance to crushing forces. This test provides valuable information about the quality and strength of the concrete, helping engineers ensure that it meets the necessary requirements for structural applications. The other options mentioned, such as the slump test or concrete beam, are not directly related to determining compressive strength.

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12. Penetration test is for asphalt: cement is to _____? 

Explanation

The analogy presented in the question is comparing penetration test, which measures the hardness of asphalt, to cement. When conducting a penetration test on asphalt, consistency is an important factor to consider. Similarly, when evaluating cement, consistency refers to its ability to maintain a uniform composition and workability. Therefore, consistency is the correct answer to complete the analogy.

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13. What is that construction material that has a property of being a dark brown toblack cementitious material in which the predominating substance is bitumen? 

Explanation

Asphalt is the correct answer because it is a construction material that is dark brown to black in color and is predominantly made up of bitumen. Bitumen is a sticky, black, and highly viscous substance that is derived from petroleum. Asphalt is commonly used in road construction and is known for its durability and ability to withstand heavy traffic and harsh weather conditions. It is often mixed with aggregates to create asphalt concrete, which is used to pave roads, parking lots, and other surfaces.

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14. Why is it that cooling an oven dried sample before weighing is advisable? 

Explanation

Cooling an oven dried sample before weighing is advisable because it can affect its weight. When a sample is heated in an oven to remove moisture, it can also cause the sample to expand or contract, leading to changes in weight. By allowing the sample to cool to room temperature before weighing, we can obtain a more accurate measurement of its weight without the interference of temperature-related changes.

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15. What is the rate of application of bituminous tack coat? 

Explanation

The rate of application of bituminous tack coat is typically between 0.2 to 0.7 L/sq. m. This means that for every square meter of surface area, a quantity of bituminous tack coat ranging from 0.2 to 0.7 liters should be applied. This range allows for variations in surface conditions and ensures proper bonding between the layers of asphalt or bitumen.

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16. What kind of sample is taken for flexural test? 

Explanation

In a flexural test, a concrete beam sample is taken. This is because the flexural test is used to measure the strength and stiffness of a material when subjected to bending forces. Concrete beams are commonly used in construction and are designed to withstand bending forces. Therefore, taking a concrete beam sample is the appropriate choice for conducting a flexural test.

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17. How many concrete cores shall be taken for one (1) kilometer concrete pavement? 

Explanation

The correct answer is 5 holes/km/lane. Concrete cores are taken to assess the quality and strength of the concrete pavement. Taking 5 holes per kilometer per lane ensures that a sufficient number of samples are collected to accurately represent the quality of the pavement. This allows for a comprehensive evaluation of the concrete's strength and durability, helping to identify any potential issues or weaknesses in the pavement.

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18. If sieve analysis and plasticity test are used for Soil Classification, what test thatits result be used in field density test? 

Explanation

The correct answer is Compaction Test or Moisture Density Relation Test. These tests are used to determine the maximum dry density and optimum moisture content of the soil, which are important parameters for field density testing. The compaction test measures the density achieved by compacting the soil at various moisture contents, while the moisture density relation test determines the relationship between moisture content and dry density. Both tests provide valuable information for assessing the compaction characteristics and field density of the soil.

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19. Slump test is a very important test in fresh concrete to determine _____? 

Explanation

The slump test is used to determine the consistency of fresh concrete. Consistency refers to the ability of the concrete mix to flow and be easily molded. By measuring the slump, which is the amount of vertical settlement that the concrete undergoes after a cone-shaped mold is removed, the test can provide an indication of the workability and fluidity of the concrete mixture. Therefore, the correct answer is consistency of concrete.

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20. What is the length required for RSB sample for quality test?

Explanation

The length required for the RSB sample for quality test is 1.0 m. This is indicated by the first option, which states that the sample should be 1.0 m in length. The other options do not specify the length of the sample, so they are not the correct answer.

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21. The road will not be opened to traffic until test specimens molded and cured haveattained the minimum strength requirements. If such tests are not conducted prior to the specified age the pavement shall not be operated to traffic until _____ days after the concrete was placed. 

Explanation

The road will not be opened to traffic until test specimens molded and cured have attained the minimum strength requirements. If such tests are not conducted prior to the specified age, the pavement shall not be operated to traffic until 14 days after the concrete was placed.

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22. Why is it that 6 samples are needed for quality test of concrete masonry? 

Explanation

In order to accurately assess the quality of concrete masonry, it is necessary to test both its compressive strength and absorption properties. Compressive strength measures the ability of the concrete to withstand applied pressure, while absorption measures its ability to absorb water. By testing three samples for each property, a more reliable and representative assessment can be made. This ensures that the concrete masonry meets the required standards for both strength and water absorption, providing a comprehensive evaluation of its quality.

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23. Sample submitted for test should have a tag bearing the name of the project, thequantity represented, kind of sample, original source, who sampled and who submitted it, the date sampled and date submitted and etc. What is the common name of that tag for you as Materials Engineer? 

Explanation

The common name of the tag for a Materials Engineer is "Sample Card". This tag is used to label and track samples in a laboratory or testing environment. It includes important information such as the name of the project, quantity represented, kind of sample, original source, who sampled and who submitted it, as well as the date sampled and date submitted. The Sample Card helps to ensure proper documentation and organization of samples, making it easier for the Materials Engineer to track and analyze data.

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24. Sample to be used for liquid limit and plastic limit tests should pass to whatsieve? 

Explanation

The correct answer is No. 40 (0.425 mm). This is because the sample to be used for liquid limit and plastic limit tests should pass through a sieve with a size of 0.425 mm. This sieve size is commonly referred to as No. 40 in the ASTM (American Society for Testing and Materials) standard. The other sieve sizes mentioned in the options are not suitable for these tests.

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25. For how many bags of cement does a 10 kgs sample represents

Explanation

A 10 kgs sample represents 2000 bags of cement. This can be determined by dividing the weight of the sample (10 kgs) by the weight of one bag of cement. If one bag of cement weighs 10 kgs, then the sample represents 2000 bags.

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26. What are the tests needed for the 2.650 cu.m Item 201 (Aggregate Base Course)? 

Explanation

The correct answer is CBR, abrasion, GPCD. These tests are needed for the 2.650 cu.m Item 201 (Aggregate Base Course). CBR (California Bearing Ratio) test is used to determine the strength of the aggregate base course material. Abrasion test is conducted to assess the resistance of the aggregate to wear and tear. GPCD (Gradation, Particle Shape, and Surface Texture) test is performed to evaluate the gradation, particle shape, and surface texture of the aggregate. All three tests are necessary to ensure the quality and suitability of the aggregate base course for its intended use.

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27. As a materials Engineer, what will you recommend if you find out that thematerials to be used as Item 200 if finer than the required materials? 

Explanation

If the materials to be used as Item 200 are finer than the required materials, blending Item 200 with coarser materials would be recommended. This is because blending it with coarser materials will help to achieve the desired particle size distribution and ensure that the final product meets the required specifications.

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28. What asphalt is used for sealing weaken plane joint of concrete pavement? 

Explanation

Blown asphalt is used for sealing weakened plane joints of concrete pavement. Blown asphalt is a type of asphalt that has been oxidized, making it more durable and resistant to temperature changes. It is commonly used in road construction and maintenance due to its ability to provide a strong and long-lasting seal. This makes it an ideal choice for sealing weakened plane joints in concrete pavement, as it helps to prevent water infiltration, reduce cracking, and extend the lifespan of the pavement.

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29. What are the other terms for sieve analysis? 

Explanation

The correct answer is "All of the Above". This means that all the other terms mentioned in the options - Grading Test, Particle Size Distribution Test, and Mechanical Analysis - are also used to refer to sieve analysis. Therefore, all of these terms can be used interchangeably to describe the process of sieve analysis.

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30. The ME should always be alert of his schedule with regards to the number of daysof a quality test that takes place. Since not all construction materials can be tested just for a day or even a week so, what is the lead time should he consider for a quality test of a cement sample? 

Explanation

The ME should consider a lead time of 1 month for a quality test of a cement sample. This is because the question states that not all construction materials can be tested for just a day or a week. Therefore, it is reasonable to assume that a longer duration is required for the quality test of a cement sample. 1 month allows for an adequate amount of time to conduct the necessary tests and ensure accurate results.

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31. Under what climatic condition do we use lower penetration grade or hard asphalt? 

Explanation

In hot climates, the temperature is high, which can cause the asphalt to soften and become more susceptible to deformation under heavy traffic loads. Therefore, lower penetration grade or hard asphalt is used to ensure that the pavement remains stable and durable in such conditions. This type of asphalt has a higher resistance to deformation and can withstand the high temperatures without becoming too soft.

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32. The minimum cement factor for concrete Class "A" is 9 bags/cu.m, how about forconcrete Class "B"?

Explanation

The correct answer is 8 bags/cu.m. This means that for concrete Class "B", the minimum cement factor is 8 bags per cubic meter of concrete. This indicates the amount of cement that needs to be added to the mixture in order to achieve the desired strength and durability.

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33. An admixture is being introduced to the fresh concrete mixture for heavilyreinforced concrete structure using a pumpcrete to pump out the fresh concrete mix, what admixture should it be? 

Explanation

Superplasticizer is the correct answer because it is an admixture that is commonly used in heavily reinforced concrete structures. It helps to improve the workability of the concrete mixture, making it easier to pump out using a pumpcrete. Superplasticizer also reduces the water content in the mixture while maintaining its flowability, resulting in a higher strength and more durable concrete.

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34. How many samples should be taken for an asphalt mix for each full day'soperation? 

Explanation

In order to ensure the quality of the asphalt mix, it is necessary to take at least one sample each day. However, taking more samples can provide a more accurate representation of the mix's composition and consistency. The answer "at least one but not to exceed three samples" allows for flexibility in sampling, ensuring that a minimum of one sample is taken while also allowing for the option to take up to three samples for more comprehensive testing.

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35. Failed samples do not necessarily mean that the structure it represents isdefective, why?may be the sampling is incorrect

Explanation

Failed samples do not necessarily mean that the structure it represents is defective because the issue could lie with the sampling process itself. If the sampling is incorrect, it can lead to inaccurate or misleading results, even if the structure being sampled is actually sound. Therefore, it is important to ensure that the sampling process is done accurately and representative of the entire structure in order to draw valid conclusions.

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36. How many grading tests are required for a 3,200 cu.m selected borrow topping(Item 104)? 

Explanation

The question is asking how many grading tests are required for a 3,200 cu.m selected borrow topping (Item 104). The correct answer is 3 grading tests. This means that in order to properly grade and test the 3,200 cu.m selected borrow topping, three separate grading tests need to be conducted.

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37. What is the rate of revolution per minute of an abrasion Machine used for testingthe mass percent of wear? 

Explanation

The correct answer is 30 - 33 rpm. This range of revolutions per minute is the rate at which the abrasion machine should operate in order to test the mass percent of wear. This specific range is likely determined by the manufacturer or industry standards as the optimal speed for accurate and consistent testing results.

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38. Quality control testing in a DPWH project is the responsibility of the_____? 

Explanation

In a DPWH project, quality control testing is the responsibility of the contractor. The contractor is responsible for ensuring that the materials and workmanship meet the specified standards and requirements. They are responsible for conducting the necessary tests and inspections to ensure the quality of the project. The contractor is also responsible for rectifying any defects or deficiencies that may be identified during the testing process. Overall, the contractor plays a crucial role in ensuring the quality of the project and meeting the required standards.

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39. One of the duties of Materials Engineer is to see to it that all the constructionmaterials be tested: 

Explanation

The correct answer is "before it is incorporated into work." As a Materials Engineer, it is their responsibility to ensure that all construction materials are tested before they are used in any project or incorporated into the construction work. This is important to ensure the quality and safety of the materials being used and to prevent any potential issues or failures in the construction process. By conducting thorough testing before incorporating the materials into work, the Materials Engineer can identify any defects, weaknesses, or inconsistencies in the materials and take appropriate actions to address them.

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40. What is the Plasticity index of mineral filler?

Explanation

The plasticity index of a mineral filler refers to its ability to change shape and retain that shape under pressure. A plasticity index not greater than 4 means that the mineral filler has a low plasticity and is less likely to change shape and retain it when subjected to pressure. This indicates that the mineral filler is relatively stable and less prone to deformation, making it suitable for various applications where stability is required.

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41. The thickness of asphalt core using a caliper is based on how manymeasurements? 

Explanation

The correct answer is 4. When measuring the thickness of an asphalt core using a caliper, four measurements are typically taken. These measurements are taken at different points across the core to ensure accuracy and account for any variations in thickness. By taking four measurements, a more reliable average thickness can be determined, providing a more accurate representation of the asphalt core's thickness.

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42. When cement is in contact with moist aggregates, batch made by mix will bedisallowed beyond ____ 

Explanation

When cement is in contact with moist aggregates, the batch made by the mix will be disallowed beyond 1 1/2 hours. This means that after 1 1/2 hours, the cement and aggregates will no longer be able to form a proper mixture and the batch will be considered unusable. This is likely due to the fact that the cement starts to harden and lose its ability to bind with the aggregates over time.

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43. What is the required mixing of mortar for Item 505 (Stone Masonry)?

Explanation

The required mixing of mortar for Item 505 (Stone Masonry) is 1 part cement and 2 parts sand by volume with sufficient water. This ratio ensures a proper balance between the cement and sand, providing the necessary strength and workability for the mortar. The addition of sufficient water helps in achieving the desired consistency for the mortar mixture.

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44. What is the formula in obtaining the value of PI? 

Explanation

The formula for obtaining the value of PI is by subtracting the Plastic Limit from the Liquid Limit. PI stands for Plasticity Index, which is a measure of the range of moisture content over which a soil exhibits plastic behavior. By subtracting the Plastic Limit from the Liquid Limit, we can determine the PI value, which is important in soil classification and engineering.

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45. What is the degree of compaction of the soil if the wet density is 2,200 kg/m3with an actual moisture content of 10.2% and a maximum dry density of 1,960kg/m3? 

Explanation

The degree of compaction of the soil can be calculated using the formula: Degree of compaction = (wet density / maximum dry density) * 100. Plugging in the given values, we get (2200 / 1960) * 100 = 112.24%. However, this value is greater than 100%, which is not possible. Therefore, the correct answer must be lower than 100%. The only option that is lower is 101.86%, which is the correct answer.

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46. The spot test on asphalt is used to determine ______. 

Explanation

The spot test on asphalt is used to determine overheating during the process of manufacture. This test helps identify if the asphalt has been subjected to excessive heat during the manufacturing process, which can negatively affect its quality and performance. By detecting overheating, necessary adjustments can be made to ensure the asphalt meets the required standards.

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47. What is the CBR requirement for Item 201? 

Explanation

The CBR requirement for Item 201 is 80% maximum. This means that the California Bearing Ratio (CBR) value for Item 201, which refers to a specific type of material or soil, should not exceed 80%. This requirement is likely based on the desired strength and stability of the material, as higher CBR values indicate greater strength and load-bearing capacity. Therefore, the lower maximum value of 80% ensures that the material meets the necessary standards for its intended use.

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48. If sample splitter is not available for use in reducing samples for test, what is thealternative way of reducing sample for testing size? 

Explanation

The alternative way of reducing the sample size for testing when a sample splitter is not available is to use the quartering method and select two opposite sides as the sample. This method involves dividing the sample into four equal parts and discarding two opposite quarters. The remaining two quarters are then combined to form the reduced sample for testing. This ensures that the reduced sample is representative of the original sample, even without the use of a sample splitter.

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49. What is the basis for the acceptance or rejection of any construction material? 

Explanation

MTR stands for Material Test Report. The basis for the acceptance or rejection of any construction material is the Material Test Report. This report provides detailed information about the quality, performance, and characteristics of the material. It includes test results, such as strength, durability, composition, and compliance with industry standards. By reviewing the MTR, engineers and construction professionals can determine if the material meets the required specifications and standards for the project, and make informed decisions regarding its acceptance or rejection.

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50. What is the size of tamping rod used in tamping concrete sample? 

Explanation

The correct answer is 16 mm Ø and 610 mm long with hemispherical tip. This size of tamping rod is commonly used in tamping concrete samples. The diameter of 16 mm ensures that the rod can effectively compact the concrete, while the length of 610 mm allows for proper handling and maneuvering during the tamping process. The hemispherical tip helps to evenly distribute the force applied to the concrete sample, ensuring consistent compaction.

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51. The molds of specimen not to be transported shall be removed after initial curingof_____ hours and should be cured to the standard curing temperature of 73.4 °F ± 3°F 

Explanation

The molds of the specimen need to be removed after an initial curing period of 24 hours. After removal, the specimen should be cured at a standard temperature of 73.4°F ± 3°F.

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52. If asphalt mix having a weight of 3,020g and an aggregate weighing 2,865.98g,what is the % asphalt by weight of mix? 

Explanation

The percentage of asphalt by weight of the mix can be calculated by dividing the weight of the asphalt by the weight of the mix and multiplying by 100. In this case, the weight of the asphalt is 3,020g and the weight of the mix is 2,865.98g. Dividing 3,020 by 2,865.98 gives approximately 1.0527. Multiplying this by 100 gives approximately 105.27%. However, since the question asks for the percentage of asphalt by weight of the mix, the answer is 5.10%.

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53. Before the project starts, the materials Engineer or the technician must have aprogram on how many samples for each item of work should be tested based on the minimum testing requirements. What program or report is this? 

Explanation

The correct answer is QCP. QCP stands for Quality Control Program. Before starting a project, the materials Engineer or technician must have a program in place that outlines how many samples for each item of work should be tested, based on the minimum testing requirements. This program ensures that quality control measures are implemented effectively throughout the project.

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54. What is the moisture content of the soil having an original weight of 162.5 gramsand an oven – dried weight of 138.2 grams? 

Explanation

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55. What is the difference between hygroscopic moisture content from naturalmoisture content? 

Explanation

The correct answer explains that hygroscopic moisture content refers to the moisture content of an air-dried sample, while natural moisture content refers to the moisture content of the original sample from the field. This means that hygroscopic moisture content is measured after the sample has been dried, while natural moisture content is measured in its original state.

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56. An embankment having a PI of 30%, LL of 40% and GI of 0, what is the degreeof compaction for this kind of soil?

Explanation

The degree of compaction refers to how much a soil has been compacted or densified compared to its natural state. In this case, the embankment has a PI (Plasticity Index) of 30%, which indicates a medium plasticity soil. The LL (Liquid Limit) of 40% suggests that the soil has a moderate amount of moisture. The GI (Grain Index) of 0 indicates that the soil is well-graded. Based on these characteristics, a degree of compaction of 95% is likely achieved, as the soil can be compacted to a high degree due to its medium plasticity and moderate moisture content.

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57. The _____ is expressed as the moisture content corresponding to 25 blows. 

Explanation

The liquid limit is a property of a soil that represents its ability to undergo plastic deformation. It is determined by conducting a specific test called the Casagrande's liquid limit test. The test involves repeatedly dropping a cup containing a soil sample from a specified height and measuring the number of blows required for the soil to change from a liquid to a plastic state. The moisture content at which 25 blows are needed is defined as the liquid limit. Therefore, the correct answer is "Liquid Limit".

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58. Quality Control Assurance Report should be submitted every _____? 

Explanation

Quality Control Assurance Reports should be submitted every week to ensure regular monitoring and evaluation of the quality control processes. This frequency allows for timely identification and resolution of any quality issues, ensuring that the organization maintains high standards of quality in its products or services.

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59. If the group index of a soil is high, what indication does it mean? 

Explanation

A high group index of a soil indicates that the soil is clayey. This means that the soil contains a significant amount of clay particles, which are smaller in size compared to sand or silt particles. Clayey soils have a higher plasticity and tend to retain more water, making them more cohesive and less permeable. They also have a higher potential for swelling and shrinking, which can affect the stability and engineering properties of structures built on such soils.

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60. Where do we take additional cores when the measurement of any core taken frompavement is deficient in thickness by more than 25 mm? 

Explanation

When the measurement of any core taken from the pavement is deficient in thickness by more than 25 mm, additional cores should be taken at no less than 5 meter intervals parallel to the centerline in each direction from the affected location. This ensures that a sufficient number of cores are taken to accurately assess the thickness of the pavement and identify any areas of deficiency. Taking cores at regular intervals in both directions from the affected location helps to provide a comprehensive understanding of the pavement's thickness and condition.

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61. How many samples shall be submitted for test if 315 pails of flat wall enamelpaint are to be used in the project? 

Explanation

To determine the number of samples that need to be submitted for testing, we need to consider the total number of pails of flat wall enamel paint being used in the project, which is 315. Since the question does not provide any specific information about the sampling process or requirements, we can assume that each pail represents a sample. Therefore, the correct answer is 4 pails, as this is the number of samples needed to represent the 315 pails of paint in the project.

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62. Item 303, application of cover aggregates shall be evenly spread over thesurface at the rate of approximately _____? 

Explanation

The correct answer is 0.004 to 0.007 m3/m2. This means that when applying cover aggregates, they should be spread evenly over the surface at a rate of approximately 0.004 to 0.007 cubic meters per square meter.

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63. The concrete has been tested for consistency by the use of a slump cone with baseand tamping rod. After the test, the height of concrete measured is 178 mm. what is the slump of the concrete? 

Explanation

The slump of concrete refers to the measure of its consistency or workability. It is determined by measuring the difference in height between the original height of the concrete and its height after it settles or slumps. In this case, the height of the concrete measured after the test is 178 mm. The correct answer of 127 mm suggests that there was a slump or settling of 127 mm, indicating that the concrete has a moderate level of workability.

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64. After the soil has been tested in an Abrasion Machine, the mass % of wearcomputed is equal to 21%. If this material is for Item 201, does it pass the DPWH specs? 

Explanation

The given correct answer is that the soil passes the DPWH specs because the maximum allowable mass % of wear is 50%. Since the computed mass % of wear is only 21%, it is within the acceptable range and therefore meets the specifications.

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65. Along the slope of high embankment _____ is provided as an erosion controlmeasures and also to improve the stability of the slope. 

Explanation

A berm is provided along the slope of a high embankment as an erosion control measure and to improve the stability of the slope. A berm is a raised area of soil or rock that is constructed along the slope. It helps to prevent soil erosion by slowing down the flow of water and reducing its erosive force. Additionally, the berm acts as a barrier, preventing the soil from sliding down the slope and improving the overall stability of the embankment.

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66. The specification calls for a 1: 2:4 concrete mix. In a one bagger mixer, which ofthe following amount of water is most likely required for the mix? 

Explanation

The 1:2:4 concrete mix ratio means that for every part of cement, there are two parts of sand and four parts of aggregate. The amount of water required for the mix is usually around 20% of the total weight of the dry ingredients. Since the question mentions a one bagger mixer, which typically holds 50 kg of cement, the most likely amount of water required would be 20 liters.

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67. What is the standard specification for LL and PI of Item 201? 

Explanation

The standard specification for LL (liquid limit) of Item 201 is a maximum of 25%, while the standard specification for PI (plasticity index) is a maximum of 6%.

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68. 55. The minimum compressive strength for concrete Class "P" is 5,000 psi, what is the minimum compressive strength for concrete Class "C"? 

Explanation

Concrete Class "P" has a minimum compressive strength of 5,000 psi. Concrete Class "C" is typically used for general construction purposes and has a lower strength requirement compared to Class "P". Therefore, the minimum compressive strength for concrete Class "C" is lower than 5,000 psi. The correct answer is 3,000 psi.

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69. What is the mixing time of concrete? 

Explanation

The correct answer is 1.5 m3. This is because the mixing time of concrete is determined by the capacity of the mixer. In this case, the capacity of the mixer is above 1.5 m3 and the minimum required mixing time is 60 seconds. Therefore, the correct answer is 1.5 m3, above 1.5 m3 capacity mixer, T ≥ 60 seconds, and capacity mixer, T ≥ 90 seconds.

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70. How long does a vibrator be inserted in a concrete mix? 

Explanation

Vibrators are used in concrete mixing to remove air bubbles and ensure proper compaction. However, leaving the vibrator in the concrete mix for too long can cause segregation and affect the quality of the concrete. The correct answer states that the vibrator should not be inserted for more than 15 seconds at a 50-60 cm interval. This time frame allows for adequate compaction without risking any negative effects on the concrete.

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71. What is the required mixing of mortar for Item 500 (Pipe Culverts and StormDrains)? 

Explanation

The required mixing of mortar for Item 500 (Pipe Culverts and Storm Drains) is 1 part cement and 2 parts sand by volume with sufficient water.

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72. If ductility test is for asphalt, _____ is for cement? 

Explanation

The given options include various tests used for different materials. The ductility test is specifically used for asphalt to measure its ability to stretch without breaking. Similarly, the tests mentioned in the answer options, namely Magnesium Oxide, Insoluble Residue, and Loss on Ignition, are used to analyze the properties of cement. These tests help determine the composition, purity, and behavior of cement under different conditions. Therefore, the correct answer is Magnesium Oxide, Insoluble Residue, Loss on Ignition.

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73. What will happen if you lower the water – cement ratio and maintaining othervalues of its ingredients? 

Explanation

Lowering the water-cement ratio means reducing the amount of water used in the mixture while keeping the other ingredients constant. This leads to a more efficient hydration process, as there is less excess water available to react with the cement particles. As a result, the cement particles are able to bond more closely, leading to a denser and stronger concrete. Therefore, the statement "it will acquire strength" is correct.

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74. High plasticity index means _____ of a soil? 

Explanation

High plasticity index refers to the ability of a soil to undergo deformation under stress. Soils with a high plasticity index have a high degree of compressibility, meaning they can be easily compressed or compacted under pressure. This indicates that the soil is more malleable and can be easily molded or shaped.

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75. How many compaction tests shall be conducted for Item 201 having a volume of8,250 cu.m?

Explanation

The correct answer is 6 compaction tests. Compaction tests are conducted to determine the compaction characteristics and the maximum dry density of a soil. The number of tests required depends on the volume of the material being tested. In this case, since the volume of Item 201 is 8,250 cu.m, it is recommended to conduct 6 compaction tests to obtain accurate and representative results.

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76. A bean mold measuring 6" x 6" x 20 is to be used for sampling concrete, howmany blows/tamps per layer shall be applied? 

Explanation

The correct answer is 60 blows/layer. This means that for each layer of concrete in the bean mold, 60 blows or tamps should be applied. This is the recommended number of blows to ensure proper compaction and density of the concrete sample.

Submit
77. The volume of concrete mixer per batch shall not exceed the mixer's nominalcapacity in cu.m as shown on the manufacturer's standard plate on the mixer, except that an overload up to _____ percent above the mixer's nominal capacity may be permitted provided concrete test data for strength, segregation, and uniform consistency are satisfactory, and provided that no spillage of concrete takes place. 

Explanation

The volume of concrete mixer per batch shall not exceed the mixer's nominal capacity in cu.m as shown on the manufacturer's standard plate on the mixer, except that an overload up to 10 percent above the mixer's nominal capacity may be permitted provided concrete test data for strength, segregation, and uniform consistency are satisfactory, and provided that no spillage of concrete takes place. This means that the mixer can handle a slight overload of up to 10 percent, but only if the concrete meets certain quality requirements and there is no spillage.

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78. The thickness of concrete core using a caliper is based on how manymeasurements? 

Explanation

When measuring the thickness of a concrete core using a caliper, nine measurements are taken. These measurements are taken at different points on the core to ensure accuracy and account for any variations in thickness. By taking multiple measurements, a more comprehensive understanding of the core's thickness can be obtained, allowing for more precise analysis and evaluation.

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79. Checking the gradation of composite aggregates and asphalt content of asphaltmix can be done by what test? 

Explanation

The extraction test is used to determine the gradation of composite aggregates and the asphalt content of asphalt mix. It involves extracting the asphalt binder from a sample of the mix using a solvent. The extracted asphalt binder is then weighed to determine the asphalt content, and the remaining aggregate is sieved to determine the gradation. This test is important in ensuring that the asphalt mix has the correct proportions of aggregate and asphalt binder, which are crucial for its performance and durability.

Submit
80. What is the temperature to be maintained when curing sample after its initialcuring? 

Explanation

The temperature to be maintained when curing the sample after its initial curing is 23°C ± 1.7°C. This means that the temperature should be kept at 23°C, with a tolerance of ± 1.7°C. This allows for a slight variation in temperature while still ensuring that the sample is cured at a consistent temperature.

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81. In final computation of concrete in road to be paid, what is the maximum sizeof pipe that is negligible in the volume computation? 

Explanation

not-available-via-ai

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82. What compaction rammer shall used if the specs given for Moisture – DensityRelation Test (MDR) is T – 180? 

Explanation

The correct answer is 4.54 kg with 457 mm drop. This is because the given specs for the Moisture-Density Relation Test (MDR) is T-180, which indicates that a 4.54 kg rammer should be used. Additionally, the drop height specified is 457 mm, further confirming that the correct answer is 4.54 kg with 457 mm drop.

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83. What apparatus is used in plastic limit test? 

Explanation

A glass plate is used in the plastic limit test because it provides a smooth and flat surface for working with the soil sample. The plastic limit test is used to determine the moisture content at which a soil transitions from a plastic to a semi-solid state. To perform the test, a small soil sample is mixed with water on the glass plate until it reaches a plastic consistency. The glass plate allows for easy manipulation and observation of the soil sample during this process.

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84. As Materials Engineer, when is the right time to start sampling and testingaggregates?

Explanation

The right time to start sampling and testing aggregates is once the source is identified. This is because it is important to determine the quality and suitability of the aggregates before they are incorporated into the project. By sampling and testing the aggregates at this stage, any potential issues or deficiencies can be identified early on, allowing for necessary adjustments or sourcing of alternative materials if needed. Testing at this stage ensures that the aggregates meet the required specifications and will contribute to the desired performance and durability of the project.

Submit
85. Concrete delivered by agitation of truck mixer must be discharged within 1hour or 250 revolutions of the drum or Olader. Why? 

Explanation

Concrete delivered by agitation of a truck mixer must be discharged within 1 hour or 250 revolutions of the drum or loader to avoid over mixing and the initial setting of concrete. Over mixing can lead to a decrease in the workability and strength of the concrete. Additionally, if the concrete sets before it is properly placed and finished, it can result in a poor quality and uneven surface. Therefore, it is important to discharge the concrete within the specified time frame to ensure the desired properties and performance of the concrete.

Submit
86. How many gradation ranges for hot plant mix bituminous are there in the blue book?

Explanation

The blue book provides seven gradation ranges for hot plant mix bituminous.

Submit
87. It is the minimum moisture content at which the soil can be molded withoutbreaking or crumbling up to 1/8" (3.2 mm). 

Explanation

The plastic limit refers to the minimum moisture content at which the soil can be molded without breaking or crumbling up to 1/8" (3.2 mm). This means that the soil is still able to maintain its shape and form when a certain amount of moisture is present, but it does not have excess moisture that would cause it to become too soft or lose its structural integrity. It is an important parameter in soil mechanics and helps determine the plasticity and behavior of the soil.

Submit
88. CBR Sample for test has been compacted but it should be soaked for how manydays before testing? 

Explanation

The correct answer is 4. This suggests that the CBR sample, which has been compacted, should be soaked for 4 days before testing. Soaking the sample helps to simulate the conditions it will experience in the field, ensuring accurate test results.

Submit
89. Paint is composed of _____ 

Explanation

The correct answer is 35% vehicle, 50% pigment, 15% beads. This means that paint is primarily composed of a vehicle, which acts as the binder and allows the paint to adhere to surfaces. The pigment provides the color, while the beads may be added for texture or other specific properties.

Submit
90. What is the required size of test specimen for G.I. sheets? 

Explanation

The required size of the test specimen for G.I. sheets is 3 pcs-60mm x 60mm in 1 sht/100sht. This means that for every 100 sheets, there should be three test specimens, each measuring 60mm x 60mm. This size is likely determined based on industry standards and testing requirements to ensure accurate and reliable results in evaluating the quality and characteristics of G.I. sheets.

Submit
91. What is the penetration grade of blown asphalt? 

Explanation

Blown asphalt is commonly used in road construction and waterproofing applications. The penetration grade refers to the hardness or softness of the asphalt. A lower penetration grade indicates a harder asphalt, while a higher penetration grade indicates a softer asphalt. In this case, the correct answer is 0 to 30 penetration grade, which means that the blown asphalt falls within the range of being relatively hard to moderately hard.

Submit
92. As the work progresses, the Materials Engineer should know how many samplehas been submitted and tested and how many samples are to be submitted, in other words the ME must refer to what report so that he/she may be updated on the balance and on file quality test of the construction materials being used in the project? 

Explanation

The correct answer is "Status of Test" because it is the report that provides information on the balance and quality test of construction materials. By referring to this report, the Materials Engineer can stay updated on the number of samples submitted and tested, as well as the number of samples yet to be submitted. This information is crucial for monitoring the progress of the work and ensuring that the construction materials meet the required standards.

Submit
93. How many days does the sample for Immersion – Compression Test be soaked inwater? 

Explanation

The sample for the Immersion - Compression Test needs to be soaked in water for 4 days at 50°C. This specific duration and temperature are necessary to ensure that the sample is properly conditioned and ready for testing. Soaking the sample for too short or too long of a period, or at a different temperature, could potentially affect the results of the test.

Submit
94. Concrete cylinders are cured and ready for test. Temperature between 63°F to85°F are permitted for a period not to exceed _____ hours immediately prior to test if free moisture is maintained on the surface of the specimen at all times. 

Explanation

Concrete cylinders need to be cured properly in order to ensure their strength and durability. The temperature range of 63°F to 85°F is considered permissible for a certain period of time before the test. This temperature range helps in maintaining the required conditions for curing the concrete. Additionally, it is important to ensure that there is free moisture on the surface of the specimen at all times during this period. Therefore, the correct answer is three (3) hours, as this is the maximum duration allowed for the temperature range mentioned, while maintaining the necessary moisture.

Submit
95. What is the material used for Bituminous Prime Coat? 

Explanation

Cut-back asphalt is the material used for Bituminous Prime Coat. Cut-back asphalt is a type of asphalt that has been mixed with a solvent to make it easier to apply. It is commonly used as a prime coat in road construction to provide a bonding surface for the subsequent layers of asphalt. The solvent in cut-back asphalt evaporates after application, leaving behind a layer of asphalt that helps to seal the road surface and prevent water penetration. This helps to improve the durability and longevity of the road.

Submit
96. What is the maximum depth or roadway embankment per horizontal layer in loosemeasurement? 

Explanation

The maximum depth or roadway embankment per horizontal layer in loose measurement is 200 mm. This means that each layer of the embankment should be a maximum of 200 mm thick.

Submit
97. If course aggregate like embankment is to be placed in layers, how many layersshould a 40 cm thick Aggregate Base Course is placed? 

Explanation

A 40 cm thick Aggregate Base Course should be placed in 3 layers. This is because when constructing embankments using course aggregate, it is common practice to place the material in layers to ensure proper compaction and stability. Each layer is typically compacted before the next layer is added. Therefore, in this case, the aggregate base course should be placed in 3 layers to achieve the desired thickness of 40 cm.

Submit
98. Applying the tolerance of 0.4% for asphalt content to your answer in prob. 47,what is the acceptable range of asphalt content?

Explanation

The acceptable range of asphalt content, considering a tolerance of 0.4%, is 4.7% to 5.5%. This means that the asphalt content can vary within this range and still be considered acceptable. Any asphalt content below 4.7% or above 5.5% would be outside of the acceptable range.

Submit
99. In oven drying a sample for test, what temperature shall be maintained? 

Explanation

The correct answer is 100 ± 5°C. This temperature range should be maintained when oven drying a sample for testing.

Submit
100. Aggregate Sub – base course has a volume of 5, 000 cu.m and to be laid in a15cm compacted depth. How many samples shall be submitted for CBR test and for sieve analysis? 

Explanation

The correct answer is 2 samples for CBR and 17 samples for sieve analysis. The CBR test measures the strength of the soil subgrade, so only 2 samples are needed to ensure an accurate representation of the subgrade's strength. On the other hand, the sieve analysis determines the particle size distribution of the aggregate, so a larger number of samples (17) is required to obtain a more comprehensive understanding of the aggregate's characteristics.

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19. What is the machine used for abrasion test? 
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What is the sample for compressive strength determination of a...
Penetration test is for asphalt: cement is to _____? 
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Why is it that cooling an oven dried sample before weighing is...
What is the rate of application of bituminous tack coat? 
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If sieve analysis and plasticity test are used for Soil...
Slump test is a very important test in fresh concrete to determine...
What is the length required for RSB sample for quality test?
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Sample submitted for test should have a tag bearing the name of the...
Sample to be used for liquid limit and plastic limit tests should pass...
For how many bags of cement does a 10 kgs sample represents
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As a materials Engineer, what will you recommend if you find out that...
What asphalt is used for sealing weaken plane joint of concrete...
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Under what climatic condition do we use lower penetration grade or...
The minimum cement factor for concrete Class "A" is 9 bags/cu.m, how...
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How many samples should be taken for an asphalt mix for each full...
Failed samples do not necessarily mean that the structure it...
How many grading tests are required for a 3,200 cu.m selected borrow...
What is the rate of revolution per minute of an abrasion Machine used...
Quality control testing in a DPWH project is the responsibility of...
One of the duties of Materials Engineer is to see to it that all the...
What is the Plasticity index of mineral filler?
The thickness of asphalt core using a caliper is based on how...
When cement is in contact with moist aggregates, batch made by mix...
What is the required mixing of mortar for Item 505 (Stone Masonry)?
What is the formula in obtaining the value of PI? 
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The spot test on asphalt is used to determine ______. 
What is the CBR requirement for Item 201? 
If sample splitter is not available for use in reducing samples for...
What is the basis for the acceptance or rejection of any construction...
What is the size of tamping rod used in tamping concrete sample? 
The molds of specimen not to be transported shall be removed after...
If asphalt mix having a weight of 3,020g and an aggregate weighing...
Before the project starts, the materials Engineer or the technician...
What is the moisture content of the soil having an original weight of...
What is the difference between hygroscopic moisture content from...
An embankment having a PI of 30%, LL of 40% and GI of 0, what is the...
The _____ is expressed as the moisture content corresponding to 25...
Quality Control Assurance Report should be submitted every...
If the group index of a soil is high, what indication does it...
Where do we take additional cores when the measurement of any core...
How many samples shall be submitted for test if 315 pails of flat wall...
Item 303, application of cover aggregates shall be evenly spread over...
The concrete has been tested for consistency by the use of a slump...
After the soil has been tested in an Abrasion Machine, the mass % of...
Along the slope of high embankment _____ is provided as an erosion...
The specification calls for a 1: 2:4 concrete mix. In a one bagger...
What is the standard specification for LL and PI of Item 201? 
55. The minimum compressive strength for concrete Class "P" is 5,000...
What is the mixing time of concrete? 
How long does a vibrator be inserted in a concrete mix? 
What is the required mixing of mortar for Item 500 (Pipe Culverts and...
If ductility test is for asphalt, _____ is for cement? 
What will happen if you lower the water – cement ratio and...
High plasticity index means _____ of a soil? 
How many compaction tests shall be conducted for Item 201 having a...
A bean mold measuring 6" x 6" x 20 is to be used for sampling...
The volume of concrete mixer per batch shall not exceed the mixer's...
The thickness of concrete core using a caliper is based on how...
Checking the gradation of composite aggregates and asphalt content of...
What is the temperature to be maintained when curing sample after its...
In final computation of concrete in road to be paid, what is the...
What compaction rammer shall used if the specs given for Moisture...
What apparatus is used in plastic limit test? 
As Materials Engineer, when is the right time to start sampling and...
Concrete delivered by agitation of truck mixer must be discharged...
How many gradation ranges for hot plant mix bituminous are there in...
It is the minimum moisture content at which the soil can be molded...
CBR Sample for test has been compacted but it should be soaked for how...
Paint is composed of _____ 
What is the required size of test specimen for G.I. sheets? 
What is the penetration grade of blown asphalt? 
As the work progresses, the Materials Engineer should know how many...
How many days does the sample for Immersion – Compression Test...
Concrete cylinders are cured and ready for test. Temperature between...
What is the material used for Bituminous Prime Coat? 
What is the maximum depth or roadway embankment per horizontal layer...
If course aggregate like embankment is to be placed in layers, how...
Applying the tolerance of 0.4% for asphalt content to your answer in...
In oven drying a sample for test, what temperature shall be...
Aggregate Sub – base course has a volume of 5, 000 cu.m and to...
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