FREE ACI Strength Testing Technician Questions and Answers

Question 1

Following the thermometer's insertion into the concrete:

Accepted Answer

All of the above

Answer

Cool the surface of concrete with water

Answer

Gently press concrete around the thermometer

Answer

Tap the side of the container 10-15 times

Question 2

What is one reason, under ASTM C1064, to take a concrete's temperature?

Accepted Answer

Verify ambient air temperature

Answer

Very slump

Answer

Verify conformance

Answer

None of the above

Question 3

Begin testing for slump and air content within after sampling is finished.

Accepted Answer

2 ½ minutes

Answer

15 minutes

Answer

10 minutes

Answer

None of the above

Question 4

In any event, wait to get samples until:

Accepted Answer

All the water and admixtures have been added to the concrete

Answer

½ of the water has been added

Answer

200 revolutions of the drum have been obtained

Answer

None of the above

Question 5

Samples cannot be taken before the batch has been released (_________) or after (_________).

Accepted Answer

20% or after 80%

Answer

10% or after 90%

Answer

20% or after 90%

Answer

None of the above

Question 6

To sample concrete from a truck mixer's chute, do the following:

Accepted Answer

Passing a receptacle completely through the discharge steam or by completely diverting the discharge into the sample container

Answer

Holding a shovel in the flow and direct half into a bucket

Answer

Raising chute to stop the flow and scoop concrete from there into the slump cone and cylinder molds

Answer

None of the above

Question 7

Samples of recent concrete that will be evaluated on the job site should come from:

Accepted Answer

Two or more regularly spaced intervals during discharge of the middle portion of the batch

Answer

The beginning of mixer discharge

Answer

The last concrete discharged

Answer

All of the above

Question 8

As to ASTM C172, the duration between acquiring the initial and final parts of the composite sample cannot be greater than:

Accepted Answer

30 minutes

Answer

20 minutes

Answer

10 minutes

Answer

None of the above

Question 9

It is important to elevate the droop cone cautiously, steadily, and vertically in ________ seconds.

Accepted Answer

3 to 7

Answer

4 to 8

Answer

2 to 6

Answer

5 to 9

Question 10

The amount of time that has passed between when the slump cone is first filled and when it is removed shall not exceed:

Accepted Answer

2 1/2 minutes

Answer

1 minute

Answer

5 minutes

Answer

15 minutes