CCIL A23.2-4C - Air Content of Plastic
Concrete by Pressure Method Questions
and Answers (2024/2025) Graded A+
What is the purpose of the air content test using the pressure method?
✔✔ To determine the amount of air entrained in fresh concrete.
Why is it important to measure air content in fresh concrete?
✔✔ To ensure durability, workability, and compliance with mix design specifications.
What type of concrete is most commonly tested for air content?
✔✔ Air-entrained concrete used in freeze-thaw environments.
What equipment is used to perform the pressure method for air content testing?
✔✔ A Type B pressure meter.
Why must the pressure meter be calibrated regularly?
✔✔ To ensure accurate and reliable test results.
1
, How should the concrete sample be obtained for the air content test?
✔✔ It should be taken from the middle portion of the batch and remixed.
What must be done before filling the pressure meter bowl with concrete?
✔✔ Ensure it is clean, moist, and properly assembled.
How many layers should the concrete be placed in during the test?
✔✔ Two layers.
Why must each layer of concrete be rodded or vibrated during placement?
✔✔ To remove entrapped air and properly consolidate the sample.
How many strokes are required per layer when rodding the concrete?
✔✔ 25 strokes per layer.
What should be done after rodding each layer?
✔✔ Tap the sides of the bowl with a mallet to release trapped air.
2
Concrete by Pressure Method Questions
and Answers (2024/2025) Graded A+
What is the purpose of the air content test using the pressure method?
✔✔ To determine the amount of air entrained in fresh concrete.
Why is it important to measure air content in fresh concrete?
✔✔ To ensure durability, workability, and compliance with mix design specifications.
What type of concrete is most commonly tested for air content?
✔✔ Air-entrained concrete used in freeze-thaw environments.
What equipment is used to perform the pressure method for air content testing?
✔✔ A Type B pressure meter.
Why must the pressure meter be calibrated regularly?
✔✔ To ensure accurate and reliable test results.
1
, How should the concrete sample be obtained for the air content test?
✔✔ It should be taken from the middle portion of the batch and remixed.
What must be done before filling the pressure meter bowl with concrete?
✔✔ Ensure it is clean, moist, and properly assembled.
How many layers should the concrete be placed in during the test?
✔✔ Two layers.
Why must each layer of concrete be rodded or vibrated during placement?
✔✔ To remove entrapped air and properly consolidate the sample.
How many strokes are required per layer when rodding the concrete?
✔✔ 25 strokes per layer.
What should be done after rodding each layer?
✔✔ Tap the sides of the bowl with a mallet to release trapped air.
2
