Free CCIL Concrete Questions and Answers

Question 1

Which of the following best describes the sampling location when retrieving a sample from a mixer/truck agitator for concrete testing?

Accepted Answer

Between 10% and 90% of the mixture depth

Answer

Explanation:
When sampling from a mixer/truck agitator for concrete testing, the sample should be taken from between 10% and 90% of the mixture depth to ensure a representative sample. This range helps avoid potential biases from the surface or bottom of the mixture. However, it's important to note that this guideline may not apply when testing with certain additives like Super P.

Question 2

When sampling plastic concrete, which method is recommended?

Accepted Answer

Passing a receptacle completely through a discharge stream

Answer

Explanation:
When sampling plastic concrete, CCIL recommends passing a receptacle completely through a discharge stream or diverting a discharge stream completely into a sampling container. This ensures a representative sample is obtained from the flowing concrete, which is crucial for accurate testing and analysis.

Question 3

When casting 3 cylinders measuring 100mm x 200mm, what is the minimum sample size required?

Accepted Answer

20 liters

Answer

Explanation:
According to CCIL standards, when casting 3 cylinders measuring 100mm x 200mm, a minimum sample size of 20 liters is required. This ensures that an adequate amount of concrete is available for proper casting and testing of the cylinders, maintaining the integrity and accuracy of the results.

Question 4

When casting 150mm x 300mm cylinders, what is the minimum sample size required?

Accepted Answer

30 liters

Answer

Explanation:
According to CCIL standards, when casting 150mm x 300mm cylinders, a minimum sample size of 30 liters is necessary. This ensures there is enough concrete for proper casting and testing, maintaining the accuracy and reliability of the results.

Question 5

When casting more than three cylinders/specimens, how much extra sample is needed?

Accepted Answer

Volume of the cylinders/specimens plus 10% extra

Answer

Explanation:
CCIL recommends adding 10% extra sample volume beyond the volume required for casting the specified number of cylinders/specimens. This additional volume accounts for any potential loss during the casting process and ensures that there is sufficient material available for testing and quality assurance purposes.

CCIL - Canadian Council of Independent Laboratories Practice Test

CCIL - Canadian Council of Independent Laboratories Practice Test

Free CCIL Concrete Questions and Answers