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

At the top of the mixture

Answer

Near the bottom of the mixture

Answer

Only from the surface of the mixture

Question 2

When sampling plastic concrete, which method is recommended?

Accepted Answer

Passing a receptacle completely through a discharge stream

Answer

Collecting a sample from the top layer of the concrete

Answer

Using a shovel to scoop out a sample from the surface

Answer

Waiting until the concrete hardens before sampling

Question 3

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

Accepted Answer

20 liters

Answer

5 liters

Answer

10 liters

Answer

15 liters

Question 4

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

Accepted Answer

30 liters

Answer

20 liters

Answer

25 liters

Answer

35 liters

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

Volume of the cylinders/specimens plus 5% extra

Answer

Volume of the cylinders/specimens plus 15% extra

Answer

Volume of the cylinders/specimens plus 20% extra

Question 6

How many water-to-cementing materials ratios are typically needed for concrete trial mixes?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 7

What temperature range is considered stable before mixing concrete?

Accepted Answer

23°C +/- 2°C

Answer

20°C to 25°C

Answer

18°C to 22°C

Answer

30°C to 35°C

Question 8

Where should cementing materials be stored?

Accepted Answer

In a dry place, in moisture-proof containers

Answer

Outdoors, exposed to sunlight

Answer

In a damp environment to prevent clumping

Answer

Mixed with aggregates to save storage space

Question 9

How much time is typically spent mixing concrete?

Accepted Answer

Mix for 3 minutes, rest for 3 minutes, and mix for 2 minutes

Answer

Mix continuously for 10 minutes

Answer

Mix for 5 minutes without interruption

Answer

Mix until the desired consistency is achieved

Question 10

When casting 150mm x 150mm x 535mm beams, what is the minimum sample size required?

Accepted Answer

55 liters

Answer

45 liters

Answer

50 liters

Answer

60 liters