ACI Section 1

Question 1

A mixture of cement paste and fine aggregate is called?

Answer 1

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Question 2

The chemical reaction between water and cement is called:

Answer 2

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Question 3

A pH value of 7.0 indicates?

Answer 3

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Question 4

The property that reflects the ease or difficulty in placing and finishing freshly mixed concrete, is called:

Answer 4

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Question 5

A chemical, such as calcium chloride, used to “speed up” the setting time of concrete is called:

Answer 5

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Question 6

A significant loss of plasticity (without heat generation) shortly after the concrete is mixed is called:

Answer 6

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Question 7

The time it takes a cement paste to have the consistency of a stiff mass is known as:

Answer 7

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Question 8

The bonding agent used in a concrete mix is:

Answer 8

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Question 9

A by-product of the combustion of pulverized coal in a coal-fired power plant is:

Answer 9

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Question 10

A material used for the purpose of delaying the setting time of concrete is:

Answer 10

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Question 11

The pH limits of mixing water to be used in NCDOT concrete are:

Answer 11

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Question 12

The weight of one gallon of water is:

Answer 12

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Question 13

The ability of hardened concrete to resist the deterioration caused by weathering, chemicals, and abrasions is known as:

Answer 13

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Question 14

The specific gravity of Portland cement is:

Answer 14

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Question 15

The NCDOT allowable range for air content in incidental and structural concrete is:

Answer 15

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Question 16

The most important effect of entrained air in concrete is to:

Answer 16

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Question 17

Concrete should have the desired slump before beginning any other tests. T/F

Answer 17

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Question 18

Two desirable properties of an aggregate are:

Answer 18

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Question 19

Admixtures must be dispersed into the concrete mixer with:

Answer 19

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Question 20

What are the 3 important factors in curing concrete?

Answer 20

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Question 21

The type of cement which has the highest fineness and the highest amount of tricalcium silicate, both factors contributing to accelerated strength gain, is:

Answer 21

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Question 22

In NCDOT mixtures fly ash may be substituted for Portland cement up to ___ by weight of the specified cement.

Answer 22

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Question 23

Which of the following has the greatest effect on the strength, durability, and water tightness of concrete?

Answer 23

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Question 24

Concrete should have the desired _____ before beginning any other tests.

Answer 24

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