Aci Written Exam

Front 1

C1064:

For concrete with aggregates less then 3”, the thermometer must remain in the fresh concrete sample a minimum of 5 min or until the temp reading stabilizes.

True or False

Back 1

False: 2-5 minutes

Front 2

C1064:

The temperature measuring device must be accurate to within 0.1 Degrees.

True or False?

Back 2

False: 1 degree Fahrenheit

Front 3

C1064:

The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete throughout a range of?

Back 3

1 degree Fahrenheit/ 30-120 degrees Fahrenheit

Front 4

C1064:

A composite sample is not needed if only the temperature test is being run.

True or False?

Back 4

True.

Front 5

C1064:

The temperature of fresh concrete in a placement must be measured by inserting a thermometer into the top 6” of concrete.

True or False?

Back 5

False- Top 3”

Front 6

C1064:

The temperature of the concrete is recorded to the nearest?

Back 6

1 Degree Fahrenheit

Front 7

C1064:

ASTM C1064 states the container used to measure temperature of concrete must be large enough to provide at least 5” of concrete around the sensor.

True or False?

Back 7

False- 3” of concrete

Front 8

C1064:

Calibrate the temperature measuring device at least________, or whenever there is a question of_________.

Back 8

Annually/Accuracy

Front 9

C1064:

After the thermometer is placed in the concrete:

A. Gently press concrete around the thermometer.

B. Cool the surface of concrete with water.

C. Tap the side of the container 10-15 times.

D. All the above

Back 9

A. Gently press concrete around the thermometer.

Front 10

C1064:

According to ASTM C1064, what is the one reason to take the temperature of concrete?

Back 10

To verify conformance.

Front 11

C1064:

It is allowable to remove the temperature measuring devices from the freshly mixed concrete to read the temperature if you cannot see the reading.

True or False?

Back 11

False- Do not remove the thermometer while reading the temp.

Front 12

C1064:

The temperature of concrete may be measured in a wheelbarrow.

True or False?

Back 12

True.

Front 13

C1064:

The temperature of concrete may be measured in a wall form.

True or False?

Back 13

True.

Front 14

C1064:

What must be done to the sample container prior to sampling the concrete?

Back 14

Dampen the container with water.

Front 15

C1064:

How long must the temperature measuring device remain in the freshly mixed concrete?

Back 15

2-5 minutes

Front 16

C1064:

After the temperature of the concrete is read, what is then required?

Back 16

Report the temperature.

Front 17

C1064:

A maximum temperature of freshly mixed concrete is specified in Test Method C1064.

True or False?

Back 17

False

Front 18

C1064:

The sample of concrete used for temperature determination must be rodded 25 times.

True or False?

Back 18

False

Front 19

C172:

The maximum allowable time between obtaining the first and last portions of the composite sample may not exceed 5 minutes.

True or False?

Back 19

False- 15 minutes

Front 20

C172:

Start molding specimens for strength tests within 30 minutes after fabricating the composite sample.

True or False?

Back 20

False- 15 minutes

Front 21

C172:

The composite concrete sample must be protected from sun, wind, contamination and rapid evaporation.

True or False?

Back 21

True

Front 22

C172:

If the concrete contains aggregate larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test.

True or False?

Back 22

True

Front 23

C172:

If the concrete contains aggregate larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test.

True or False?

Back 23

True

Front 24

C172:

The composite sample should not be remixed before beginning any tests.

True or False?

Back 24

False

Front 25

C172:

Sampling should normally be performed, as the concrete is discharged from the mixer.

True or False?

Back 25

True

Front 26

C172:

If the concrete contains aggregate larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test.

True or False?

Back 26

True

Front 27

C172:

The composite sample should not be remixed before beginning any tests.

True or False?

Back 27

False

Front 28

C172:

Sampling should normally be performed, as the concrete is discharged from the mixer.

True or False?

Back 28

True

Front 29

C172:

ASTM Method C172 includes sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment.

True or False?

Back 29

True

Front 30

C172:

After sampling is completed, start the tests for slump and air content within:

A. 2 1/2 min

B. 10 min

C. 15 min

D. None of the above

Back 30

A. 2 1/2 min

Front 31

C172:

If the concrete contains aggregate larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test.

True or False?

Back 31

True

Front 32

C172:

The composite sample should not be remixed before beginning any tests.

True or False?

Back 32

False

Front 33

C172:

Sampling should normally be performed, as the concrete is discharged from the mixer.

True or False?

Back 33

True

Front 34

C172:

ASTM Method C172 includes sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment.

True or False?

Back 34

True

Front 35

C172:

After sampling is completed, start the tests for slump and air content within:

A. 2 1/2 min

B. 10 min

C. 15 min

D. None of the above

Back 35

A. 2 1/2 min

Front 36

C172:

In any case, do not obtain samples until:

A. All water and admixtures have been added to the concrete.

B. 200 revolutions of the drum have been obtained.

C. 1/2 of the water has been added.

D. None of the above.

Back 36

A. All water and admixtures have been added to the concrete.

Front 37

C172:

If the concrete contains aggregate larger than those that are appropriate for a size of mold or equipment used, the sample should be wet-sieved before making the test.

True or False?

Back 37

True

Front 38

C172:

The composite sample should not be remixed before beginning any tests.

True or False?

Back 38

False

Front 39

C172:

Sampling should normally be performed, as the concrete is discharged from the mixer.

True or False?

Back 39

True

Front 40

C172:

ASTM Method C172 includes sampling from stationary mixers, paving mixers, truck mixers, agitators, and non-agitating equipment.

True or False?

Back 40

True

Front 41

C172:

After sampling is completed, start the tests for slump and air content within:

A. 2 1/2 min

B. 10 min

C. 15 min

D. None of the above

Back 41

A. 2 1/2 min

Front 42

C172:

In any case, do not obtain samples until:

A. All water and admixtures have been added to the concrete.

B. 200 revolutions of the drum have been obtained.

C. 1/2 of the water has been added.

D. None of the above.

Back 42

A. All water and admixtures have been added to the concrete.

Front 43

C172:

No samples shall be taken before_______ or after________ of the batch has been discharged.

A. 10% or after 90%

B. 20% or after 90%

C. 20% or after 80%

D. None of the above

Back 43

A. 10% or after 90%

Front 44

C172:

When strength tests are to be made, the minimum size of the composite sample shall be:

A. 1/4 cubic foot

B. 1 cubic foot

C. Any convenient size

D. 1 wheelbarrow

Back 44

B. 1 cubic foot

Front 45

C172:

Sample the concrete from the chute of a truck mixer by:

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

B. Passing a receptacle completely through the discharge stream or by completely diverting the discharge into the sample container.

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

D. None of the above.

Back 45

B. Passing a receptacle completely through the discharge stream or by completely diverting the discharge into the sample container.

Front 46

C172:

Sample the concrete from the chute of a truck mixer by:

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

B. Passing a receptacle completely through the discharge stream or by completely diverting the discharge into the sample container.

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

D. None of the above.

Back 46

B. Passing a receptacle completely through the discharge stream or by completely diverting the discharge into the sample container.

Front 47

C. Two or more regular

Back 47

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

Front 48

C172:

Sample the concrete from the chute of a truck mixer by:

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

B. Passing a receptacle completely through the discharge stream or by completely diverting the discharge into the sample container.

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

D. None of the above.

Back 48

B. Passing a receptacle completely through the discharge stream or by completely diverting the discharge into the sample container.

Front 49

C. Two or more regular

Back 49

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

Front 50

C172:

The elapsed time between obtaining the first and final portions of the composite sample, according to ASTM C172, shall not exceed:

A. 10 min

B. 20 min

C. 30 min

D. None of the above.

Back 50

D. None of the above.

Front 51

C172:

When sampling from a stationary mixer, the batch must be sampled at_____ or more regularly spaced intervals.

Back 51

2

Front 52

C172:

When sampling from a stationary mixer, the batch must be sampled at_____ or more regularly spaced intervals.

Back 52

2

Front 53

C172:

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.

Back 53

5

Front 54

C172:

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

Back 54

2

Front 55

C172:

When concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be_______ before making a test.

Back 55

Wet-sieved

Front 56

C172:

Fresh concrete to be sampled at the job site should be sampled from?

Back 56

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