Materials Engineer Quiz

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1/104 Questions

During construction of a road project , if all the materials to be used are tested for quality , inspection is no longer required
- True
- False
- Option 3
- Option 4

About This Quiz

The Materials Engineer Quiz assesses knowledge on concrete and aggregate handling, focusing on preservative penetration, scale accuracy, batching timelines, and mixing durations. Essential for aspiring materials engineers to ensure adherence to industry standards.

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2.

What is the temp of the concrete sample?
- 10-15
- 18-24
- 16-18
- 15--20
Correct Answer

A. 18-24

Explanation

The correct answer is 18-24. This range represents the temperature of the concrete sample. The temperature of the concrete is an important factor to consider during construction and curing processes. This range ensures that the concrete is within the optimal temperature range for proper curing and strength development. Concrete that is too hot or too cold can result in poor quality and compromised structural integrity. Therefore, maintaining a temperature range of 18-24 degrees Celsius is crucial for achieving the desired outcomes in concrete construction.

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3.

The concrete sample should be stored in a moist condition temperature within the range of __until the time of tests
- 18* c -24*c
- 15* c -18*c
- 14* c -24*c
- 16* c -24*c
Correct Answer

A. 18* c -24*c

Explanation

The concrete sample should be stored in a moist condition temperature within the range of 18°C - 24°C until the time of tests. This temperature range is ideal for maintaining the moisture content of the concrete sample, which is important for its proper curing and testing. Lower temperatures may slow down the curing process, while higher temperatures may cause excessive drying and shrinkage of the sample. Therefore, maintaining a temperature between 18°C - 24°C ensures optimal conditions for the concrete sample's storage.

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4.

Unless otherwise specified in special provision , the type of portland cement used in paving concrete shall be
- Type2
- Type1
- Type3
- Type4
Correct Answer

A. Type1

Explanation

The correct answer is type1. In paving concrete, unless otherwise specified in special provisions, type 1 Portland cement is used. Type 1 cement is a general-purpose cement that is suitable for various applications, including paving. It is commonly used in construction projects where high strength is required. Type 1 cement provides good durability and resistance to cracking, making it ideal for paving concrete.

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1
5.

Proper compaction of the fill matls is very important, as it will
- Increase the shear strength
- Decrease permiability
- Minimize compressibility
- All of the above
Correct Answer

A. All of the above

Explanation

Proper compaction of the fill materials is important because it has multiple benefits. Firstly, it increases the shear strength of the material, making it more resistant to sliding or deformation. Secondly, it decreases permeability, which means that it reduces the ability of water or other fluids to pass through the material. Finally, it minimizes compressibility, ensuring that the material remains stable and does not settle or deform under load. Therefore, all of the above benefits can be achieved by proper compaction of the fill materials.

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6.

_ indicates the composition of soil
- Atterberg limit
- Plasticity bindex
- Liquid limit
- Shrinkage limit
Correct Answer

A. Atterberg limit

Explanation

The Atterberg limit is a measure of the consistency of a soil. It refers to the range of moisture content at which the soil transitions between different states, such as from solid to plastic or plastic to liquid. It consists of three limits: the liquid limit, plastic limit, and shrinkage limit. The Atterberg limit is important in determining the engineering properties of soil, such as its ability to be compacted or its susceptibility to shrinkage or swelling.

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1
7.

Concrete not place within __minutes from the time the ingredients were charged into the mixing drum shall be used.
- 120
- 150
- 60
- 90
Correct Answer

A. 90

Explanation

The correct answer is 90. This means that if the concrete is not placed within 90 minutes from the time the ingredients were charged into the mixing drum, it should not be used. This time limit ensures that the concrete is still fresh and workable, as concrete that sits for too long can lose its desired properties and become less effective for construction purposes.

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8.

As a matls engineer , what will you do with the major honeycombed area that is considered as defective work
- Plaster
- Removed and replaced at the expensed of the contractor
- Payment of concrete will be made an adjustment
- None
Correct Answer

A. Removed and replaced at the expensed of the contractor

Explanation

The correct answer suggests that as a materials engineer, the major honeycombed area that is considered defective work should be removed and replaced at the expense of the contractor. This means that the contractor is responsible for fixing the issue and covering the costs associated with the replacement.

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9.

Minimum penetration of piles shall be__
- 3m
- 4
- 5
- 8
Correct Answer

A. 3m

Explanation

The minimum penetration of piles shall be 3m. This means that the piles must be driven into the ground to a depth of at least 3 meters. This requirement is important to ensure the stability and load-bearing capacity of the piles, as a sufficient depth of penetration helps to anchor the piles securely and distribute the load effectively. A deeper penetration also helps to avoid any potential issues such as settlement or lateral movement of the piles. Therefore, it is essential to adhere to this minimum penetration requirement for the successful construction of the piles.

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0
10.

The physical and engineering properties of soils may be improved by
- Compaction
- Stabilization
- Both a and b
- Neither a or b
Correct Answer

A. Both a and b

Explanation

Both compaction and stabilization can improve the physical and engineering properties of soils. Compaction involves reducing the air voids in the soil, increasing its density and strength. This process helps to prevent settlement and improves the load-bearing capacity of the soil. On the other hand, stabilization involves adding materials such as cement, lime, or fly ash to the soil to enhance its strength and durability. This process can also reduce the soil's susceptibility to water damage and improve its resistance to erosion. Therefore, both compaction and stabilization techniques can be used to improve the properties of soils.

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11.

Which one do you like?
- Option 1
- Option 2
- Option 3
- Option 4
Correct Answer

A. Option 1
12.

Which one do you like?
- Option 1
- Option 2
- Option 3
- Option 4
Correct Answer

A. Option 1
13.

For a bituminopus concrete mixes, the asphalt material may either be asphalt cement or asphalt emulsion
- True
- False
- Option 3
- Option 4
Correct Answer

A. True

Explanation

Bituminous concrete mixes can be made using either asphalt cement or asphalt emulsion as the asphalt material. Asphalt cement is a semi-solid form of petroleum that is heated and mixed with aggregates to create a durable and flexible pavement. On the other hand, asphalt emulsion is a mixture of asphalt cement, water, and an emulsifying agent. It is a more environmentally friendly option as it requires less energy to produce and emits fewer greenhouse gases. Therefore, the statement that the asphalt material for bituminous concrete mixes can be either asphalt cement or asphalt emulsion is true.

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14.

The job mix formula provides for close control of
- Aggregate gradation
- Asphalt content
- Both of them
- None
Correct Answer

A. Both of them

Explanation

The job mix formula is a method used in asphalt pavement design to determine the appropriate aggregate gradation and asphalt content for a specific mixture. By considering both the aggregate gradation and asphalt content, the job mix formula allows for close control over the composition of the asphalt mixture, ensuring that it meets the required specifications for performance and durability. This comprehensive approach helps optimize the mixture's properties and performance, making it suitable for the intended application.

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15.

The penetration test is an indication of the __of asphalt
- Consistency
- Softness
- Hardness
- Flash point
Correct Answer

A. Consistency

Explanation

The penetration test is a method used to measure the consistency of asphalt. It involves measuring the depth to which a standard needle penetrates the asphalt sample under specific conditions. The consistency of asphalt refers to its ability to flow or deform under load. A higher penetration value indicates a softer consistency, while a lower penetration value indicates a harder consistency. Therefore, the correct answer in this case is consistency.

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1
16.

__ is applied on existing bit, or cement concrete surface with bitum matls
- Bituminous tack coat
- Bituminous sealcoat
- Bituminous prime coat
- Bituminous surface coat
Correct Answer

A. Bituminous tack coat

Explanation

A bituminous tack coat is applied on an existing bit or cement concrete surface with bituminous materials. This coat helps to create a bond between the existing surface and the new bituminous layer that will be applied on top. It ensures better adhesion and prevents the new layer from delaminating or separating from the existing surface. The tack coat acts as a glue, providing a strong and durable connection between the two layers.

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17.

The undisturbed samples from shelby tube shall be at least _
- 12"
- 14"
- 16"
- 18"
Correct Answer

A. 18"

Explanation

The undisturbed samples from a Shelby tube should be at least 18 inches long. This length ensures that the sample collected is representative of the soil conditions and minimizes disturbance during extraction. A longer sample length provides a more accurate analysis of the soil properties and allows for better interpretation of the data.

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1
18.

Pre stressed concrete requires the use of class
- A
- B
- C
- P
Correct Answer

A. P
19.

A soil with a GI of 5 is stronger than another with a GI of 10
- True
- False
- Option 3
- Option 4
Correct Answer

A. True

Explanation

A soil with a GI (Geotechnical Index) of 5 is stronger than another soil with a GI of 10 because the lower the GI value, the stronger the soil. The GI is a measure of the soil's strength and stability, with lower values indicating higher strength. Therefore, a soil with a GI of 5 would be considered stronger than a soil with a GI of 10.

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1
20.

The desired property of fresh concrete is
- Strength
- Durability
- Workability
- Tigthness
Correct Answer

A. Workability

Explanation

Workability is the desired property of fresh concrete. It refers to the ease and ability of the concrete to be mixed, placed, and compacted without segregation or excessive bleeding. A concrete mix with good workability is easier to handle and can be shaped and finished with minimal effort. It allows for proper filling of formwork and ensures that the concrete reaches all corners and edges, resulting in a uniform and well-compacted structure. Workability is an important characteristic as it directly affects the ease of construction and the final quality of the hardened concrete.

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1
21.

When cement is placed in contact with the aggregate , batches may rejected unless mixed with __ hours of such contact.
- 1.5
- 2
- .5
- 2.5
Correct Answer

A. 1.5

Explanation

When cement comes in contact with aggregate, it starts to hydrate and harden. If this contact lasts for too long, it can lead to a loss of workability and strength in the concrete mix. Therefore, in order to prevent this, the cement and aggregate should be mixed within 1.5 hours of coming into contact with each other. This ensures that the concrete mix remains of good quality and can be used for construction purposes.

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22.

The depth of the weakened joints must not be less than __ and width of__
- 40mm & 6mm
- 50mm & 6mm
- 60mm & 6mm
- 70mm & 6mm
Correct Answer

A. 50mm & 6mm

Explanation

The depth of the weakened joints must not be less than 50mm and the width must be 6mm. This is likely because a depth of 50mm provides enough space for the weakened joint to be effective in distributing stress and preventing failure. The width of 6mm may be sufficient for the specific application or material being used.

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23.

It indicate good sub base materials when GI is equal to__
- 2
- 3
- 0
- 1
Correct Answer

A. 0

Explanation

A GI (Group Index) is a measure of the strength and suitability of sub base materials for road construction. A GI value of 0 indicates that the sub base materials have excellent strength and are highly suitable for road construction. This means that the sub base materials have a low plasticity index and high California Bearing Ratio (CBR), which are desirable characteristics for good sub base materials. Therefore, when the GI is equal to 0, it indicates good sub base materials.

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3
24.

Disturbed sample may be used for
- Sieve test
- Liquid limit
- Compaction test
- All
Correct Answer

A. All

Explanation

A disturbed sample may be used for all of the mentioned tests because these tests do not require the sample to be in its original undisturbed state. In sieve testing, the sample is passed through a series of sieves to determine the particle size distribution. Liquid limit testing involves determining the moisture content at which a soil transitions from a liquid to a plastic state. Compaction testing involves compacting the soil to a specific density to assess its suitability for construction. In all of these tests, the disturbed sample can still provide valuable information about the soil's properties.

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25.

In concrete acceptance , core will be considered adequate if the average strength of the cores is = to what?
- 80% of specified strength and if no single core is less than 75% of specified strength
- 90% of specified strength and if no single core is less than 80% of specified strength
- 85% of specified strength and if no single core is less than 75% of specified strength
- 90% of specified strength and if no single core is less than 75% of specified strength
Correct Answer

A. 85% of specified strength and if no single core is less than 75% of specified strength

Explanation

The correct answer is 85% of specified strength and if no single core is less than 75% of specified strength. This means that in concrete acceptance, the average strength of the cores should be equal to or greater than 85% of the specified strength. Additionally, no single core should have a strength less than 75% of the specified strength. This ensures that the concrete cores are adequately strong and meet the required standards for acceptance.

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26.

This is the one of the most important engg properties of soil . it is defined as the ability to resist sliding along internal surface within the mass
- Triaxial test
- Shearing strength of soil
- Bearing stress
- Durect shear test
Correct Answer

A. Shearing strength of soil

Explanation

Shearing strength of soil is the correct answer because it is the property that measures the soil's ability to resist sliding along internal surfaces within its mass. This property is crucial in engineering as it helps determine the stability and load-bearing capacity of soil structures. The shearing strength is typically determined through tests such as the triaxial test or direct shear test. Bearing stress refers to the pressure exerted on the soil by a structure, but it does not specifically measure the soil's ability to resist sliding.

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27.

A bituminous coating applied in an existing road to laying of a bituminous surface overlay is
- Prime coat
- Tack coat
- Seal coat
- Option 4
Correct Answer

A. Tack coat

Explanation

A tack coat is a bituminous coating applied to an existing road before laying a bituminous surface overlay. It helps to bond the new layer of asphalt to the existing pavement, providing a strong and durable surface. The tack coat acts as a glue, allowing the new layer to adhere properly and prevent any separation or delamination. This ensures the longevity and effectiveness of the road surface overlay.

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3
28.

The contractor shall submit in writing a job mix formula for the mixture supported by laboratory test data along with samples of resources of components and viscous temperature relationships to the engineer for testing and approval at least.
- 2 weeks
- 3 weeks
- 1 week
- 4 weeks
Correct Answer

A. 3 weeks

Explanation

The contractor is required to submit a job mix formula for the mixture, along with laboratory test data and samples of resources, to the engineer for testing and approval. This process takes a certain amount of time, and the contractor must submit these documents at least 3 weeks before the testing and approval is needed. This allows the engineer enough time to review and assess the job mix formula and make a decision.

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5
29.

If the strentgh of control specimen does not meet the req. and not feasible to obtain cores due to structural considerations , as a matls engr what will be your decision?
- Removed and replaced
- Area will not be paid
- Payment will be made at an adjusted price
- None
Correct Answer

A. Payment will be made at an adjusted price

Explanation

If the strength of the control specimen does not meet the requirements and it is not possible to obtain cores due to structural considerations, the decision as a materials engineer would be to make payment at an adjusted price. This means that the payment for the project will be modified based on the lower strength of the control specimen. This adjustment accounts for the deviation from the specified requirements and ensures fair compensation for the work done.

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30.

Plasticity test is done on soil passing
- .425mm
- 2mm
- .07mm
- Option 4
Correct Answer

A. .425mm

Explanation

The plasticity test is conducted on soil particles that pass through a sieve with a size of 0.425mm. This test helps to determine the plasticity index of the soil, which is a measure of its ability to undergo deformation without cracking or crumbling. By analyzing the behavior of the soil particles that fall within this size range, engineers and geologists can assess the soil's ability to support structures and make informed decisions regarding construction projects.

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4
31.

This is used in soil stabilized road surface due to its high __ property, that is, it absorb the retain water
- Potassium chloride
- Magnessium chloride
- Sodium chloride
- Calcium chloride
Correct Answer

A. Magnessium chloride

Explanation

Magnesium chloride is used in soil stabilized road surfaces due to its high absorbent property, meaning it can absorb and retain water. This property helps to prevent the road surface from becoming too dry or too wet, which can lead to cracking, potholes, and other damage. Magnesium chloride helps to maintain the stability and integrity of the road, making it a suitable choice for soil stabilization.

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0
32.

Is the process whereby soil particles are contained more closely together through the reduction in the air voids generally by mechanical means
- Soil compaction
- Mechanical analysis
- In place unit wiegth
- Cbr
Correct Answer

A. Soil compaction

Explanation

Soil compaction refers to the process of reducing the air voids between soil particles through mechanical means. This can be achieved by applying pressure or force to the soil, causing the particles to come closer together. Compacted soil has a higher density and reduced air spaces, which can improve its stability, load-bearing capacity, and resistance to water infiltration. Compaction is commonly done in construction and engineering projects to ensure the soil can support structures or withstand heavy loads without settling or experiencing excessive deformation.

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33.

The flow of water shall be uniform and all water should be in drum by the end of the first__ seconds of the mixing period.
- 45
- 30
- 15
- 20
Correct Answer

A. 15

Explanation

The correct answer is 15 because it is stated that the flow of water should be uniform and all water should be in the drum by the end of the first 15 seconds of the mixing period. This means that within the first 15 seconds, all the water should have been added to the drum and there should be no more water flowing after this time.

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1
34.

Vibration shall operate a frequency of 8300 to 9600 impulses per minute under load at a maximum spacing of __cm
- 30
- 40
- 50
- 60
Correct Answer

A. 60

Explanation

The correct answer is 60 because the question states that the vibration shall operate at a frequency of 8300 to 9600 impulses per minute under load. The maximum spacing of the vibration is not specified in the question, so we can assume that the maximum spacing is not restricted. Therefore, the maximum spacing can be any value, but it must be less than or equal to 60 cm in order to fulfill the given frequency range.

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4
35.

If the slag is used , the density of coarse aggregates is ___
- 30-100 kg/cu m
- 50-100 kg/cu m
- 1120 kg/cu m
- 1400 kg/cu m
Correct Answer

A. 1120 kg/cu m

Explanation

The correct answer is 1120 kg/cu m. Slag is a byproduct of metal smelting and can be used as a substitute for natural aggregates in construction materials. It has a lower density compared to natural aggregates, which results in a lower overall density of the coarse aggregates when slag is used. Therefore, the density of coarse aggregates is 1120 kg/cu m when slag is used.

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1
36.

The density to which a soil can be compacted is related to
- Compactive efforts
- Water content
- A and b
- None
Correct Answer

A. A and b

Explanation

The density to which a soil can be compacted is related to both compactive efforts and water content. Compactive efforts refer to the amount of energy applied to the soil during the compaction process, which helps in rearranging the soil particles and increasing its density. Water content also plays a crucial role as it affects the soil's ability to compact. The presence of water helps in lubricating the soil particles, making it easier to compact. Therefore, both compactive efforts and water content are important factors in determining the density to which a soil can be compacted.

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1
37.

When mixed at the site or in a central mixing plant, the mixing time shall not be less than __ nor more than __ unless mixer performance test prove adequate mixing of concrete in a short period of time.
- 30 seconds nor more than 90 seconds
- 50 seconds nor more than 90 seconds
- 60 seconds nor more than 120 seconds
- 90 seconds nor more than 120 seconds
Correct Answer

A. 50 seconds nor more than 90 seconds

Explanation

When mixing concrete at the site or in a central mixing plant, the mixing time should ideally be between 50 seconds and 90 seconds. This range ensures that the concrete is adequately mixed. However, if mixer performance tests demonstrate that the concrete can be properly mixed in a shorter period of time, then the mixing time can be reduced. It is important to find the right balance between mixing the concrete thoroughly and minimizing the time required for the mixing process.

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38.

The __ is the most commonly used method in the design and evaluation of bituminous concrete mixes
- Job mix formula
- Marshall stability
- Extraction
- Design mix
Correct Answer

A. Marshall stability

Explanation

Marshall stability is the most commonly used method in the design and evaluation of bituminous concrete mixes. This method measures the resistance of the mix to deformation and cracking under load. It involves compacting a cylindrical specimen of the mix and subjecting it to a load until failure occurs. The load at which failure occurs, known as Marshall stability, is used to determine the quality and performance of the mix. This method is widely accepted and used in the industry due to its reliability and correlation with field performance.

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39.

The sp, gravity of sodium sulfate used in soundness test for aggregate should be in range of
- 1.051-1.154
- 1.058/-1.184
- 1 1.151-1.174
- 1.25-14.178
Correct Answer

A. 1 1.151-1.174

Explanation

The correct answer is 1.151-1.174. In the soundness test for aggregate, sodium sulfate is used to determine the resistance of the aggregate to disintegration. The specific gravity of the sodium sulfate solution used in this test should fall within the range of 1.151-1.174. This specific gravity range ensures that the concentration of sodium sulfate is appropriate for the test and will provide accurate results in determining the soundness of the aggregate.

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40.

Tolerance of gabion dimension is_-
- +- 1%
- +- 2%
- +- 3%
- +- 4%
Correct Answer

A. +- 3%

Explanation

The correct answer is +- 3% because tolerance refers to the allowable deviation from the specified dimension. In this case, the tolerance for gabion dimension is +- 3%, meaning that the actual dimension of the gabion can vary by up to 3% from the specified dimension. This allows for a certain level of flexibility in the manufacturing process while still ensuring that the gabion meets the required standards and specifications.

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7
41.

Minimum density of gabions
- 1000kg/cu m
- 1200kg/cu m
- 1400kg/cu m
- 1600kg/cu m
Correct Answer

A. 1400kg/cu m

Explanation

Gabions are wire mesh containers filled with stones or other materials used for erosion control and retaining walls. The minimum density of gabions refers to the minimum weight per unit volume that the gabions should have to ensure stability and effectiveness. In this case, the correct answer is 1400kg/cu m, which means that the gabions should have a density of 1400 kilograms per cubic meter to meet the minimum requirements. This density ensures that the gabions are heavy enough to withstand external forces and provide the necessary support and protection.

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1
42.

Paint contains __-% pigment and vehicle___
- 20,80
- 21,79
- 79,21
- 80,20
Correct Answer

A. 21,79

Explanation

The correct answer is 21,79. This means that paint contains 21% pigment and 79% vehicle. Pigment is the component that provides color and opacity to the paint, while the vehicle is the liquid that holds the pigment together and allows it to be applied. This ratio ensures that the paint has enough pigment to achieve the desired color and coverage while still being fluid enough to be easily applied.

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1
43.

The degree of compaction of an embankment in our present specs is based on
- Cbr method
- Unconfined compression test
- Aashto t-180
- Bulk sp, gravity
Correct Answer

A. Aashto t-180

Explanation

The correct answer is AASHTO T-180. AASHTO T-180 is a test method used to determine the moisture-density relationship of soils. It provides guidelines for compaction control of embankments and other earthwork structures. This test method involves compacting soil samples at various moisture contents and measuring their densities. The results are then used to determine the optimum moisture content and maximum dry density, which are essential for achieving the desired compaction of an embankment.

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0
44.

Between stage of curing , concrete shall not be exposed for more than ___ hours
- 24
- 1.5
- 3
- 14
Correct Answer

A. 24

Explanation

During the stage of curing, it is important to protect the concrete from drying out too quickly. If concrete is exposed for more than 24 hours, it can lead to a loss of moisture and result in a weaker and less durable final product. This is because the curing process allows the concrete to gain strength and develop its desired properties. Therefore, it is crucial to ensure that the concrete is not exposed for more than 24 hours to maintain its quality and integrity.

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1
45.

After concrete has been placed , it is advisable to maintain fully welted and in position for how many hours
- 14
- 24
- 72
- 15-18
Correct Answer

A. 72

Explanation

After concrete has been placed, it is advisable to maintain it fully wetted and in position for 72 hours. This is because during this time, the concrete undergoes the process of hydration, where it reacts with water to form a strong and durable solid structure. Maintaining the concrete wet helps to prevent it from drying out too quickly, which can lead to cracking and reduced strength. By keeping it wet for 72 hours, the concrete can properly cure and achieve its maximum strength and durability.

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46.

Tests for coarse aggregates include
- Abrasion
- Mortar strength
- Absorption
- All of the preceeding
- A and c
Correct Answer

A. A and c

Explanation

The correct answer is "a and c". This means that the tests for coarse aggregates include both abrasion and absorption. Abrasion test measures the resistance of aggregates to wear and is important in determining their durability. Absorption test, on the other hand, measures the ability of aggregates to absorb water, which is crucial in understanding their moisture content and potential for moisture-related damage. Therefore, tests for coarse aggregates include both abrasion and absorption.

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47.

Scales for weighing aggregates and cement shall be accurate within % throughout the range of use., Scales shall be inspected and sealed as often as the Engineer may deem necessary to assure their continued accuracy.
- 1%
- 1.5%
- 0.5%
- 2%
Correct Answer

A. 0.5%

Explanation

The correct answer is 0.5%. This means that the scales used for weighing aggregates and cement must be accurate within 0.5% throughout the range of use. It is important for the scales to be inspected and sealed regularly to ensure their continued accuracy, as deemed necessary by the Engineer. This level of accuracy is necessary to ensure that the right amount of aggregates and cement are used in construction projects, as even small deviations can affect the quality and strength of the final product.

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48.

Which of the following microstructural features in metals is most critical for enhancing resistance to fatigue failure?
- Large grain size
- Coarse pearlite structure
- Fine grain size
- High dislocation density
Correct Answer

A. Fine grain size

Explanation

Fine grain size is crucial for improving a metal's resistance to fatigue failure. Smaller grains provide more grain boundaries, which act as barriers to crack initiation and propagation, a primary cause of fatigue failure. This enhances the material's overall durability under cyclic loading conditions. Large grain size and coarse pearlite can reduce fatigue strength, while high dislocation density can increase strength but may also increase susceptibility to fatigue under certain conditions.

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0
49.

____ is the slump of workable concrete if vibrated
- 10-20mm
- 10-30mm
- 10-40mm
- 10-60mm
Correct Answer

A. 10-40mm

Explanation

The slump of workable concrete refers to the amount of vertical settlement or sag that occurs when the concrete is subjected to vibration. A slump of 10-40mm indicates that the concrete has a moderate level of workability, allowing it to be easily placed and compacted. This range ensures that the concrete is not too stiff or too fluid, striking a balance between ease of handling and achieving the desired strength and durability.

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1

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Current Version
Aug 30, 2024

Quiz Edited by
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Feb 23, 2014

Quiz Created by
Benjie_torrente

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Quiz Preview

What is the temp of the concrete sample?

The concrete sample should be stored in a moist condition temperature within the range of __until the time of tests

Unless otherwise specified in special provision , the type of portland cement used in paving concrete shall be

Proper compaction of the fill matls is very important, as it will

_ indicates the composition of soil

Concrete not place within __minutes from the time the ingredients were charged into the mixing drum shall be used.

As a matls engineer , what will you do with the major honeycombed area that is considered as defective work

Minimum penetration of piles shall be__

The physical and engineering properties of soils may be improved by

Which one do you like?

Which one do you like?

For a bituminopus concrete mixes, the asphalt material may either be asphalt cement or asphalt emulsion

The job mix formula provides for close control of

The penetration test is an indication of the __of asphalt

__ is applied on existing bit, or cement concrete surface with bitum matls

The undisturbed samples from shelby tube shall be at least _

Pre stressed concrete requires the use of class

A soil with a GI of 5 is stronger than another with a GI of 10

The desired property of fresh concrete is

When cement is placed in contact with the aggregate , batches may rejected unless mixed with __ hours of such contact.

The depth of the weakened joints must not be less than __ and width of__

It indicate good sub base materials when GI is equal to__

Disturbed sample may be used for

In concrete acceptance , core will be considered adequate if the average strength of the cores is = to what?

This is the one of the most important engg properties of soil . it is defined as the ability to resist sliding along internal surface within the mass

A bituminous coating applied in an existing road to laying of a bituminous surface overlay is

The contractor shall submit in writing a job mix formula for the mixture supported by laboratory test data along with samples of resources of components and viscous temperature relationships to the engineer for testing and approval at least.

If the strentgh of control specimen does not meet the req. and not feasible to obtain cores due to structural considerations , as a matls engr what will be your decision?

Plasticity test is done on soil passing

This is used in soil stabilized road surface due to its high __ property, that is, it absorb the retain water

Is the process whereby soil particles are contained more closely together through the reduction in the air voids generally by mechanical means

The flow of water shall be uniform and all water should be in drum by the end of the first__ seconds of the mixing period.

Vibration shall operate a frequency of 8300 to 9600 impulses per minute under load at a maximum spacing of __cm

If the slag is used , the density of coarse aggregates is ___

The density to which a soil can be compacted is related to

When mixed at the site or in a central mixing plant, the mixing time shall not be less than __ nor more than __ unless mixer performance test prove adequate mixing of concrete in a short period of time.

The __ is the most commonly used method in the design and evaluation of bituminous concrete mixes

The sp, gravity of sodium sulfate used in soundness test for aggregate should be in range of

Tolerance of gabion dimension is_-

Minimum density of gabions

Paint contains __-% pigment and vehicle___

The degree of compaction of an embankment in our present specs is based on

Between stage of curing , concrete shall not be exposed for more than ___ hours

After concrete has been placed , it is advisable to maintain fully welted and in position for how many hours

Tests for coarse aggregates include

Scales for weighing aggregates and cement shall be accurate within % throughout the range of use., Scales shall be inspected and sealed as often as the Engineer may deem necessary to assure their continued accuracy.

Which of the following microstructural features in metals is most critical for enhancing resistance to fatigue failure?

____ is the slump of workable concrete if vibrated

The depth of the weakened joints must not be less than and width of

When mixed at the site or in a central mixing plant, the mixing time shall not be less than nor more than unless mixer performance test prove adequate mixing of concrete in a short period of time.

Paint contains -% pigment and vehicle_