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Admixtures in Concrete

Air entrainin...

Question

Air entraining agent is commonly mixed in concrete to control.

A

Evaporation

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B

Expansion

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C

Water cement ratio

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D

Contraction

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Solution

The correct option is B Expansion
Air entraining agent is commonly mixed with concrete to counteract the stress which gets induced when the water inside the concrete freezes and is expended so it is added to control expansion.

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Similar questions

Q. In handling air-entraining admixtures the beneficial amount of entrained air depends upon certain factors like
1. Type and quantity of air-entraining agent
2. Water-cement ratio of the mix
3. Strength of aggregates
4. Extent of compaction of concrete

Q. Consider the following statements about the air entraining admixture in concrete:
1.Improve workability
2. Improve durability
3. Reduce segregation during placing
4. Decrease concrete density
Which of these statements are correct?

Q. The cement concrete from which entrained air and excess water is removed after placing it in position is called.

Q. Air entrainment Portland Cement-
(i) offers great resistance to sulphate attack
(iI) offers great resistance to freezing and thawing
(iii) reduces the possibility of shrinkage and crack formation in the concrete surface
(iv) is suitable for mass concreting

Q. The composition of an air-entrained concrete is given below:

Water \to 184 k g / m^{3}

Ordinary Portland Cement (OPC) \to 368 k g / m^{3}

Sand \to 606 k g / m^{3}

Coarse aggregate \to 1155 k g / m^{3}

Assume the specific gravity of OPC, sand and coarse aggregate to be 3.14, 2.67 and 2.74 respectively. The air content is_____

l i t r e s / m^{3}

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