Civil Engineering - Concrete Technology - Discussion


The maximum amount of dust which may be permitted in aggregates is

[A]. 5% of the total aggregates for low workability with a coarse grading
[B]. 10% of the total aggregates for low workability with a fine grading
[C]. 20% of the total aggregates for a mix having high workability with fine grading
[D]. all the above.

Answer: Option D


No answer description available for this question.

Sadulla Ahmed said: (Jan 24, 2014)  
Option B & C saying that work-ability increases with the increase of dust. I have confusion in these two.

K.P.Singh said: (May 13, 2014)  
20% Dust mix & Proper gain strength for concrete.

Er. Soumya Choudhury said: (Mar 21, 2015)  
Yeah exactly option B and C are countering each other. Any body please clarify.

Parveen Kaushik said: (May 5, 2015)  
Some confusion this concept no 3. Its not correct here 20% of dust all in aggregate not fine aggregate.

Sapan Rijal said: (Dec 29, 2015)  
Deleterious material is permitted only upto 5%. Isn't the dust deleterious one?

Muzaffar said: (Apr 12, 2016)  
In option B and C fine grading is there, so the dust is also a fine material. I think that may be the reason.

Mahi said: (Jul 17, 2017)  
Please anybody clarify this.

Mahesh Ramhari Bajabale said: (Jul 21, 2017)  
Silt content more than 10% in the sand is not allowed. According to IS code.

Ankit said: (Feb 8, 2018)  
Please anybody clarify the answer.

Aadarsh Devkate said: (May 31, 2018)  
No, provision is maximum 5% for all kinds.

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