Civil Engineering - Concrete Technology - Discussion

29. 

The most useless aggregate is one whose surface texture is

[A]. smooth
[B]. granular
[C]. glassy
[D]. honey combed and porous.

Answer: Option C

Explanation:

No answer description available for this question.

Puja said: (Jul 28, 2016)  
Why? Give explanation.

Prithvendra Singh said: (Aug 21, 2016)  
I think glassy aggregates will not form bonds easily with other components of concrete mixture.

Sanket Gaikwad said: (Oct 10, 2016)  
Why only glassy rather than smooth? Smooth texture also not make good bond and fais in shear and compresive stress.

Midhun Madhav said: (Mar 27, 2017)  
Glassy and smooth are different. A smooth aggregate for convenience can be a rounded aggregate also. It will have microscopic pores even though it may appear smooth to us. The bonding between the cement and aggregate would happen at this level rather than on the macro scale. Now, in the case of glassy, the surface lacks this microscopic rough surface. Hence Glassy is the correct answer.

Ankur Bhatt said: (Aug 19, 2017)  
Thanks for the fabulous explanation @Midhun.

Hir said: (Sep 11, 2017)  
How it can not be honey comb and porous?

Abishkar said: (Sep 19, 2017)  
Agree @Midhun Madhav.

The surface lacks this microscopic rough surface, that's why it is very suitable for concrete mix.

D) honey combed and porous will be the answer.

Amit said: (Apr 5, 2018)  
Agree @Midhun Madhav.

Karan said: (May 25, 2018)  
Why not the correct answer is D?

I agree @Midhun.

Anjali said: (Sep 17, 2019)  
Honey combed and porous is the correct answer.

Dillip said: (May 8, 2021)  
Agree, Thanks @ Anjali.

Aman said: (Jul 24, 2021)  
Honeycomb and porous aggregates can be used in light weight structures so glassy will be correct.

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