ACI Section 1 Flashcards
A mixture of cement paste and fine aggregate is called?
.
The chemical reaction between water and cement is called:
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A pH value of 7.0 indicates?
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The property that reflects the ease or difficulty in placing and finishing freshly mixed concrete, is called:
.
A chemical, such as calcium chloride, used to “speed up” the setting time of concrete is called:
.
A significant loss of plasticity (without heat generation) shortly after the concrete is mixed is called:
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The time it takes a cement paste to have the consistency of a stiff mass is known as:
.
The bonding agent used in a concrete mix is:
.
A by-product of the combustion of pulverized coal in a coal-fired power plant is:
.
A material used for the purpose of delaying the setting time of concrete is:
.
The pH limits of mixing water to be used in NCDOT concrete are:
.
The weight of one gallon of water is:
.
The ability of hardened concrete to resist the deterioration caused by weathering, chemicals, and abrasions is known as:
.
The specific gravity of Portland cement is:
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The NCDOT allowable range for air content in incidental and structural concrete is:
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The most important effect of entrained air in concrete is to:
.
Concrete should have the desired slump before beginning any other tests. T/F
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Two desirable properties of an aggregate are:
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Admixtures must be dispersed into the concrete mixer with:
.
What are the 3 important factors in curing concrete?
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The type of cement which has the highest fineness and the highest amount of tricalcium silicate, both factors contributing to accelerated strength gain, is:
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In NCDOT mixtures fly ash may be substituted for Portland cement up to ___ by weight of the specified cement.
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Which of the following has the greatest effect on the strength, durability, and water tightness of concrete?
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Concrete should have the desired _____ before beginning any other tests.
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