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Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 1 (Q.No. 16)
Concrete Technology
16.
The maximum amount of dust which may be permitted in aggregates is
5% of the total aggregates for low workability with a coarse grading
10% of the total aggregates for low workability with a fine grading
20% of the total aggregates for a mix having high workability with fine grading
all the above.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 1 of 2.
Irshad Ahmad said:   6 years ago
By replacing sand with dust strength increases. We have performed this test in the lab. We replaced the sand with crusher dust and as we were increasing the percentage of dust the corresponding strength also increased.
(2)
Karan said:   4 years ago
Dust have increased shrinkage will be occur.
(1)
Sadulla Ahmed said:   1 decade ago
Option B & C saying that work-ability increases with the increase of dust. I have confusion in these two.
K.p.singh said:   1 decade ago
20% Dust mix & Proper gain strength for concrete.
Er. Soumya Choudhury said:   1 decade ago
Yeah exactly option B and C are countering each other. Any body please clarify.
Parveen kaushik said:   1 decade ago
Some confusion this concept no 3. Its not correct here 20% of dust all in aggregate not fine aggregate.
Sapan Rijal said:   10 years ago
Deleterious material is permitted only upto 5%. Isn't the dust deleterious one?
Muzaffar said:   10 years ago
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:   8 years ago
Please anybody clarify this.
Mahesh Ramhari Bajabale said:   8 years ago
Silt content more than 10% in the sand is not allowed. According to IS code.
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