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UPSC Civil Service Exam Questions - Engineering

Q1:

Which one of the following is the correct statement ?
Smaller size of aggregates in a concrete mix :

A provides larger surface area for bonding with the mortar matrix which increases the compressive strength and reduces the stress concentration at the mortar-aggregate interface

B is economical as the concrete mix is more dense

C requires lesser cement for a particular water-cement ratio and hence is economical

D is beneficial as these aggregates can pass through the reinforcement bars more easily

ANS:A - provides larger surface area for bonding with the mortar matrix which increases the compressive strength and reduces the stress concentration at the mortar-aggregate interface

The Answer should be A.

Larger size of aggregate is more workable than the smaller size of aggregate because, smaller size aggregate requires more quantity of water for lubrication however, the smaller size aggregates provides large surface area for bonding with the mortar matrix. Which increases the compressive strength and reduces the stress concentration in the mortar- aggregate interface.