Question

1. You are designing a concrete mix. indicate if you should use an aggregate with high or low absroption or if it doesnt matter and explain your answer. 2. You are designing a asphalt mix. indicate if you should use an aggregate with high or low absroption or if it doesnt matter and explain your answer.

Answer 1

ANSWER.1 In case of concrete design mix, aggregate with low water absorption (not more than 2-3%) should be used in order to achieve proper strength and characteristics in concrete.

This is because high water absorption in aggregate results in absorbing water in a large quantity sometimes even after the mixing or placing of the concrete which results in further scarcity of water for the other process in concrete such as cement hydration.

Also, high water absorption means large number of pores in the aggregate, which causes the decrease in strength of aggregate making it it non-durable and not good for concrete.

ANSWER.2 For asphalt mix also, aggregate with low water absorption is preferred because, aggregate with higher water absorption property will absorb the Asphalt Binder & due to this asphalt Binder will further be not available for coating and binding purpose indirectly more Asphalt Binder will be required if we are using High water absorption aggregate. So it is desirable to use aggregate with lower water absorption property ( not more than 4-5%).

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