Prime Cm&s - Columbus Office - Field Technician Quiz

Dampening the slump cone and base prior to testing is important because it helps to prevent the concrete mix from sticking to the equipment. This ensures that the slump test results are accurate and representative of the actual workability of the concrete. Similarly, dampening the equipment for air tests is necessary to create a proper seal and prevent air leakage during the test. Therefore, it is true that the equipment for both air and slump tests should be dampened prior to testing.

The pour release number should be written on both the field testing worksheet and the specimen cards for each set of cylinders. This ensures that the pour release number is properly documented and can be easily referenced in the future. Writing it on the back of the daily report or on the top of the cylinder molds may not provide the same level of clarity and organization as writing it on the field testing worksheet and specimen cards.

All of the above tests must have occurred whenever a set of cylinders is made because each test serves a different purpose in ensuring the quality and integrity of the cylinders. The slump test measures the consistency and workability of the concrete mix, the air test checks for the presence and amount of air entrained in the mix, and the temperature test monitors the temperature of the concrete during the curing process. By conducting all three tests, any potential issues or deviations in the concrete mix can be detected and addressed, resulting in stronger and more reliable cylinders.

Carrying extra testing sheets for compaction and concrete is a good idea because unexpected work often arises in construction projects. Having the necessary paperwork readily available allows for efficient and effective testing and documentation, ensuring that the project can proceed smoothly without delays. Being prepared with extra testing sheets helps to avoid potential setbacks and ensures that all necessary testing can be conducted promptly. Therefore, it is advisable to carry extra testing sheets for compaction and concrete.

Layer numbers 2 and 3 should be rodded 1 inch into the previous layer. The given information states that Layer 2 is 3 inches thick and Layer 3 is 1.5 inches thick. Since the question asks how far these layers should be rodded into the previous layer, the correct answer is 1 inch.

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The correct answer is "Displaced Original Center -&- 0.25"". This means that when measuring the slump, it should be measured down to the point where the original center of the concrete has been displaced, and the measurement should be recorded to the nearest 0.25 inches. This is important because it allows for accurate and consistent measurements of the slump, which is a measure of the consistency and workability of the concrete.

The thermometer is inserted 3 inches into the fresh concrete when retrieving a temperature reading. This depth allows for an accurate measurement of the concrete's internal temperature, which is important for monitoring its curing process and ensuring the desired strength and durability of the final product. A deeper insertion may result in inaccurate readings, while a shallower insertion may not provide a representative temperature of the concrete's core.

The thermometer should remain submerged in the concrete for at least 2 minutes, but no more than 5 minutes. This time frame ensures that the thermometer has enough time to accurately measure the temperature of the concrete. If the thermometer is removed too quickly, it may not provide an accurate reading. On the other hand, if it is left in for too long, the temperature reading may be affected by factors such as ambient temperature or heat transfer from the thermometer itself. Therefore, a window of 2 to 5 minutes is recommended for obtaining the most accurate temperature measurement.

After retrieving the composite sample from the concrete truck and wheeling it over to the testing area, the first action should be to remix the composite sample with a scoop or shovel. This is important because during transportation, the components of the concrete may have settled or separated, leading to an inconsistent mixture. Remixing ensures that the sample is homogenous and representative of the entire batch. This will provide accurate results when conducting tests such as slump cone and air meter pot measurements.

The correct answer is that air and slump tests should begin within 5 minutes after retrieving the composite sample. This is because the concrete must "rest" for 5 minutes before beginning a test. This resting period allows any air bubbles to rise to the surface and any settling or segregation of the concrete to occur. Starting the tests within this 5-minute window ensures that the concrete is still in its fresh state and accurately represents its properties.

During a concrete pour, it is important to document any out-of-the-ordinary occurrences for future reference and analysis. The daily report is a comprehensive record of the day's activities, including any issues or deviations from the normal process. Therefore, noting these occurrences on the daily report ensures that they are properly documented and can be easily reviewed by project stakeholders, such as the project manager, for further action or investigation.

Using deformed or squished cylinder molds is not acceptable because it can affect the accuracy and reliability of the test results. The shape of the mold needs to be uniform and consistent in order to properly measure and test the concrete samples. If the mold is oblong or oval, it will not provide accurate results and cannot be tested effectively in the lab. Therefore, it is false that it's okay to use deformed or squished cylinder molds.

The driver's name is not required to be retrieved from each concrete batch ticket. The other options, such as the truck number, admixtures included in the batch, and the ticket number, are necessary information that should be included on the batch ticket. However, the driver's name may not be relevant or necessary for tracking or documenting the concrete batch.

Having two air-meters for a larger concrete pour is a wise decision because air-meters can malfunction unexpectedly. By bringing an extra air-meter, the risk of a malfunctioning meter causing delays or inaccuracies in measuring air content can be mitigated. This precautionary measure ensures that the concrete pour can proceed smoothly and without any interruptions.

After rodding each lift, the sides of the air pot must be struck with a mallet 10-15 times. This action is necessary to ensure that the soil in the air pot settles properly and allows for accurate measurements during the scooping of the next lift. Striking the sides of the air pot with a mallet helps to compact the soil and remove any air voids, ensuring a more reliable and consistent result in the subsequent lift.

The correct answer is true. This is because all tests are required to be representative of the concrete being placed. In this situation, the concrete has been altered by adding an ad-mixture or water to the truck, which means that the original composite sample is no longer representative. Therefore, it is necessary to restart all testing with a new composite sample to ensure accurate results.

The given answer is true because it states that if a vehicle is not functioning or driving properly, it is the responsibility of the individual to inform the lab manager about the issue. This is important because the lab manager cannot address these issues in a timely manner if they are not made aware of them. By relaying the problem to the lab manager, they can take the necessary steps to address and resolve the issues with Prime's trucks.

The slump cone is filled in three lifts. This means that the concrete mixture is poured into the cone in three separate stages or increments. Filling the cone in multiple lifts allows for better compaction and ensures that the concrete is evenly distributed throughout the cone. This method helps to achieve accurate and consistent results when measuring the slump of the concrete, which is an important factor in determining its workability and consistency.

On the side of each cylinder, the project name, the date, and the set number should be marked. This information is important for identification and tracking purposes, as it allows for easy reference and organization of the cylinders. The project name helps to associate the cylinder with a specific project, the date indicates when the cylinder was made, and the set number helps to differentiate between different sets of cylinders within the project.

The tamping rod should be held slightly inclined when rodding the first (bottom) layer. This allows for the concrete to be compacted evenly and helps in removing any air bubbles or voids. Holding the rod slightly inclined also prevents any splattering or segregation of the concrete during the rodding process.

Turning in dirty or sloppy reports is not acceptable because the testing reports are sent directly to clients and need to be presentable. If a report is messy or sloppy, it will have to be rewritten to ensure it meets the required standards of presentation.

After the strike off procedure, if concrete or cement has dripped down the sides of the cylinder mold, it is important to wipe it off with a rag or the technician's glove. This not only makes it easier to strip the mold but also reduces the mess that may be left behind the next day.

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The tamping rod is the only tool prescribed for smoothing the top of the slump cone. This means that no other tool should be used for this purpose. The strike-bar, mentioned in the question, should not be used to screed and smooth the top of the slump cone. The tamping rod is specifically designed and recommended for this task.

The gauge needs to be pumped to the Initial Pressure before releasing the chamber valve. This suggests that the gauge should be pumped to a certain pressure level before proceeding with the release of the chamber valve.

The given answer is false because the statement in the question clearly states that the temperature should be recorded to the nearest 0.1°F, not 1°F. This means that the temperature should be measured and recorded with a decimal point, allowing for more precise measurements.

The correct answer is false because adding water to the concrete in the pot changes its composition and properties. As a result, it is no longer representative of the composite sample that was initially tested. Therefore, it cannot be remixed into the composite sample for further testing or crafting cylinders.

The statement suggests that the air-meter is filled in three lifts of equal volume. This means that the air-meter is filled gradually in three equal parts rather than all at once. Therefore, the correct answer is true.

You should write down all of the concrete admixtures on both your field test report and on the specimen card for each set of cylinders. This ensures that the information is accurately recorded and easily accessible for future reference. Writing it on the bottom of your daily report or on the lids for each cylinder mold may not provide a comprehensive record of the admixtures used. Writing it on the back of your hand is not a suitable location as it can easily be lost or washed off.

A "pour release form" is a form that is submitted by the contractor to provide information about the schedule and placement of an upcoming concrete pour. This form is commonly used on plant and tunnel jobs to ensure that the pouring process is properly planned and executed. It helps in coordinating the work and ensuring that all necessary preparations are made before the concrete is poured.

The correct answer is false because before testing, the rim of the air-meter pot should be cleaned and the gasket of the air-meter head needs to be dampened. This ensures that the testing is accurate and reliable.

The correct answer is that cylinders must be crafted within 15-minutes after retrieving the composite sample. This is because the composite sample represents the overall quality and characteristics of the concrete, and it is important to capture this accurately by making the cylinders as soon as possible. Waiting longer than 15 minutes may result in changes to the concrete's properties, affecting the accuracy of the cylinder test results. Therefore, it is crucial to initiate the cylinder crafting process promptly after retrieving the composite sample.

The ideal overnight/initial curing temperature for concrete specimens is 60°F-80°F. This temperature range provides optimal conditions for the concrete to cure and gain strength. Temperatures below 60°F may lead to slower curing and lower strength development, while temperatures above 80°F can cause rapid drying and potential cracking. It is important to maintain a controlled temperature within this range to ensure the proper curing and strength of the concrete specimens.

The correct answer is the Pot/Bucket Factor, found on the calibration sheet included with each air-meter. The unit weight of concrete is calculated by multiplying the weight of the concrete in a filled and striked-off air pot with the Pot/Bucket Factor. This factor is specific to each air-meter and is provided on the calibration sheet. It takes into account the volume and dimensions of the air pot used in the measurement. Therefore, the Pot/Bucket Factor is essential in accurately determining the unit weight of the concrete.

The responsibility to provide a suitable curing environment for concrete specimens initial cure lies with the contractor. This is because the contractor is responsible for the construction process and ensuring that the concrete is properly cured to achieve its desired strength and durability. The contractor needs to follow appropriate curing methods such as maintaining the right temperature, moisture, and protection from external factors to ensure the concrete cures effectively.

If the contractor is unable or unwilling to provide a suitable curing environment, Prime is prepared to bring all of the above options to the site. This means that they will bring a cure box/cooler, heating/cooling devices depending on the overnight temperatures, and a high/low thermometer. This ensures that the curing process can be properly controlled and monitored, regardless of the conditions on site.

The correct answer is True. The concrete from the slump test can be remixed back into the composite sample and used again because it has not been altered in any way. By remixing it, the concrete can be reused for further testing or other purposes.

The air content should be recorded to the nearest 0.1% because it is important to have accurate measurements of the air content in order to assess the quality and performance of the concrete. A small change in air content can have a significant impact on the strength and durability of the concrete. Therefore, recording the air content to the nearest 0.1% allows for precise monitoring and control of the concrete's properties.

Losing the thermometer, tamping rod, or strike bar may not be a big deal in the sense that they can be replaced. However, it is still important to notify the lab manager immediately so that the tools can be replaced for the next person to use the concrete gear. This ensures that the testing process can continue smoothly and accurately.

Air-meters are devices used to measure the volume of air flowing through a system. Calibration is the process of adjusting and verifying the accuracy of these devices. Regular calibration is necessary to ensure that the air-meters provide accurate measurements. Calibrating them once every 3 months allows for any potential drift or inaccuracies to be detected and corrected in a timely manner. This frequency ensures that the air-meters consistently provide reliable and precise measurements, which is crucial for various applications such as HVAC systems, industrial processes, and environmental monitoring.

The correct answer is False. Using a mallet to tap the side of the cylinder mold can dent and damage the molds. Instead, it is recommended to use an open hand to tap the mold 10-15 times in order to close any voids created by rodding.

A concrete pressure air-meter pot typically has a volume of 1/4 cubic foot. This means that the pot is designed to hold and measure the volume of air that is entrapped in a given amount of concrete. The 1/4 cubic foot volume is a standard size for these pots and allows for accurate measurement of the air content in the concrete mixture.

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