Quizlet Cards

Question 1

The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C] throughout a range of _____.

Answer 1

1 degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]

Question 2

The temperature measuring device shall be calibrated _____, or whenever there is a question of _____.

Answer 2

Annually, accuracy

Question 3

The temperature of concrete may be measured in a wheelbarrow. True or False?

Answer 3

True

Question 4

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

Answer 4

True

Question 5

A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False?

Answer 5

False

Question 6

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

Answer 6

Dampen (with water)

Question 7

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

Answer 7

At least 2 minutes but not more than 5 minutes

Question 8

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

Answer 8

Verify conformance to a specified requirement for temperature of concrete

Question 9

This method covers sampling from four types of mixtures which are _____, _____, _____, and _____.

Answer 9

Stationary mixers, paving mixers, revolving drum mixers, and open top mixers

Question 10

The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes.

Answer 10

15

Question 11

The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is _____ minutes.

Answer 11

5

Question 12

The molding of strength test specimens shall begin within _____ minutes after fabricating the composite sample.

Answer 12

15

Question 13

The concrete sample must be protected from contamination and _____.

Answer 13

Rapid Evaporation

Question 14

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 14

2

Question 15

The composite sample for a paving mixer must represent a minimum of _____ different portions of the batch of concrete taken from the pile after discharge.

Answer 15

5

Question 16

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

Answer 16

Wet Seived

Question 17

The slump test is applicable to plastic concrete with a maximum size aggregate of _____.

Answer 17

1.5 in. [37.5 mm]

Question 18

When the concrete contains aggregate larger than allowed for the slump test, the large aggregate must be _____.

Answer 18

Removed by wet sieving the sample over 1.5 in. [37.5 mm] sieve

Question 19

The interior surface of the slump mold is allowed to have minor irregularities. True or False?

Answer 19

False

Question 20

For use in the slump test, the end or both ends of the tamping rod must be _____.

Answer 20

Rounded to a hemispherical tip

Question 21

The sample of concrete for use in making the slump test must be obained in accordance with ASTM Standard _____.

Answer 21

C172, Standard Practice for Sampling Freshly Mixed Concrete

Question 22

The surface on which the slump mold will be placed must be _____.

Answer 22

Flat, level, moist, nonabsorbent, and free of vibration

Question 23

The slump mold is filled in _____ layers.

Answer 23

3

Question 24

How deep should the tamping rod penetrate into each layer?

Answer 24

Rod each layer throughout its depth; on the second and final layers, the rod should penetrate into the previous layer approximately 1 in. [25 mm]

Question 25

What must be done if the concrete drops below the top of the slump mold while the top layer is being rodded?

Answer 25

Add additional concrete to keep an excess of concrete above the top of the mold at all times

Question 26

How much time is allowed for lifting the slump mold?

Answer 26

5 +- 2 seconds