Civil Engineering - Concrete Technology - Discussion

40. 

The type of aggregates not suitable for high strength concrete and for pavements subjected to tension, is

[A]. rounded aggregate
[B]. irregular aggregate
[C]. angular aggregate
[D]. flaky aggregate
[E]. none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Chinu Singla said: (Nov 30, 2015)  
Why not flaky? Flaky also unsuitable for any type of construction.

Sonu said: (May 2, 2017)  
I think it's Option E.

Thara said: (Jun 21, 2017)  
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.

Sonu said: (Dec 22, 2017)  
I agree @Thara.

Rabindra said: (Apr 18, 2018)  
Nice, Thanks @Thara.

Riya said: (Oct 9, 2018)  
If void is less then surface area should be maximum.

Anirban Roy said: (Jul 26, 2019)  
Flaky aggregate is also not suitable and so it is irregular.

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