Section 1

Question 1

Collecting a representative sample of concrete to be tested is as important as executing the test methods to obtain ___________ ___________

Answer 1

Accurate results

Question 2

This practice covers sampling from four types of equipment, which are?

Answer 2

1. Stationary
2. Revolving
3. Agitating
4. Continuous

Question 3

The elapsed time between obtaining the first and final portions of a composite sample shall not exceed

Answer 3

15 Minutes

Question 4

T/F? Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample

Answer 4

True

Question 5

Start tests for slump, temperature, and air content within ____ minutes after obtaining the final portion of the composite sample

Answer 5

5 minutes

Question 6

Start molding specimens for strength tests within _______ minutes after fabricating the composite sample

Answer 6

15 minutes

Question 7

The concrete sample must be protected from contamination and __________________

Answer 7

Evaporation

Question 8

The minimum size sample for making strength test specimens is ___________

Answer 8

1ft^3

Question 9

When sampling from a stationary mixer, the batch must be sampled at _________ or more regularly spaced intervals during discharge of the middle portion of the batch.

Answer 9

Two

Question 10

When sampling from a paving mixer, obtain samples from at least _________ different portions of the pile and combine them into one composite sample for test purposes

Answer 10

5

Question 11

When sampling from a revolving truck mixer, sample the concrete by collecting _______ or more portions taken at regularly spaced intervals during discharge of the middle portion of the batch

Answer 11

Two

Question 12

T/F? Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site

Answer 12

False

Question 13

When the concrete contains aggregate larger then that permitted for a particular test method, the sample of concrete must be __________ ___________ before making the test

Answer 13

Wet Screened

Question 14

What must occured before a sample of concrete can be taken from a revolving drum mixer?

Answer 14

All water and admixtures must be added to the mixer

Question 15

When sampling from a stationary or revolving drum mixer, what is collected and when is it taken during discharge?

Answer 15

In two or more portions of concrete
At regularly spaced intervals
From the middle of the batch

Question 16

How are the sample portions obtained from the discharge stream of a stationary or revolving drum mixer?

Answer 16

Repeatedly pass a receptacle through the entire discharge stream

Completely divert the discharge stream into a sampler container

Question 17

Describe the procedure for collecting a sample from a paving mixer

Answer 17

Discharge the contents of the paving mixer

Obtain samples from at least 5 different portions of the pile

Question 18

What is the minimum size for a sample when strength test specimens are to be molded?

Answer 18

1ft^3
One cubic foot

Question 19

What is the maximum allowable time between obtaining the first and final portions of the composite sample?

Answer 19

15 minutes

Question 20

What action is required after the individual concrete samples have been transported to the place where tests are to be performed?

Answer 20

Combine and remix with a shovel. (Wheelbarrow)

Question 21

What should be done if the concrete contains aggregate larger than is appropriate for the size of the molds or equipment being used?

Answer 21

Wet sieving (screening)

Question 22

Start the tests for slump, temperature, and air content within how many minutes after obtaining the final portion of the composite sample?

Answer 22

5 minutes

Question 23

Start molding specimens for the strength tests within how many minutes after fabricating the composite sample?

Answer 23

15 minutes

Question 24

From what must the concrete sample be protected?

Answer 24

Sun, wind, and rapid evaporation

Contamination