Civil Engineering - Concrete Technology - Discussion

Rounded aggregate is very good for workability in a minimum quantity of water and cement. But very poor bouncing between ingredient. So according to question, it is poor for tension. But in the compression side, it is very good. So the answer is rounded aggregate.

Why not flaky? Flaky also unsuitable for any type of construction.

I think it's Option E.

The aggregate with rounded shape has the minimum percentage of voids ranging from 32 to 33%. It gives minimum ratio of surface area to given volume and hence requires minimum water for lubrication. It gives good workability for the given amount of water and hence needs less cement for a given water cement ratio. The only disadvantages is that the interlocking between its particles is less and hence the development of bond is poor. This is why rounded aggregate is not suitable for high strength concrete and for pavements subjected to tension.

I agree @Thara.

Nice, Thanks @Thara.

If void is less then surface area should be maximum.

Flaky aggregate is also not suitable and so it is irregular.

It should be Angular.