Civil Engineering - Concrete Technology - Discussion
Discussion Forum : Concrete Technology - Section 1 (Q.No. 23)
23.
The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning
Discussion:
23 comments Page 1 of 3.
Ranadip Chakraborty said:
1 decade ago
Both 1:2:8 and 1:4:10 are wrong proportions.
1:1:2 - M25.
1:2:4 - M15.
1:3:6 - M10.
1:2:8 - Wrong proportion, it should be 1:4:8 for M7.5.
1:4:10 - Wrong Proportion, it should be 1:5:10 for M5.
Hence the correct answer is Both Option D and E,. I think they have mistakenly wrote 1:2:8 instead of 1:4:8 , as it does not have any option to give both D and E as correct answer.
And regarding our IS : 456-2000 , there is no such provision given for Volume Batching, as our code says criteria only about Weight Batching and there Relative Proportions, But the above proportions are Nominal Mix Proportions which are used for Volume Batching Only, hence we don't have seen such Proportions on IS Code.
1:1:2 - M25.
1:2:4 - M15.
1:3:6 - M10.
1:2:8 - Wrong proportion, it should be 1:4:8 for M7.5.
1:4:10 - Wrong Proportion, it should be 1:5:10 for M5.
Hence the correct answer is Both Option D and E,. I think they have mistakenly wrote 1:2:8 instead of 1:4:8 , as it does not have any option to give both D and E as correct answer.
And regarding our IS : 456-2000 , there is no such provision given for Volume Batching, as our code says criteria only about Weight Batching and there Relative Proportions, But the above proportions are Nominal Mix Proportions which are used for Volume Batching Only, hence we don't have seen such Proportions on IS Code.
Samm said:
9 years ago
1:2:8 is the wrong answer because the ratio of fine aggregate to coarse aggregate, in this case, 1 : 4 but usual range of fine aggregate to coarse aggregate should be within 1 : 1.5 to 1 : 2.5.
Nash said:
7 years ago
The option F is correct None of these.
1:1:2 - M25.
1:2:4 - M15.
1:3:6 - M10.
1:2:8 - Wrong proportion, it should be 1:4:8 for M7.5.
1:4:10 - Wrong Proportion, it should be 1:5:10 for M5.
1:1:2 - M25.
1:2:4 - M15.
1:3:6 - M10.
1:2:8 - Wrong proportion, it should be 1:4:8 for M7.5.
1:4:10 - Wrong Proportion, it should be 1:5:10 for M5.
(6)
SumanT said:
7 years ago
Arbitrary Method of proportioning of concrete:.
The general expression for the proportions of cement, sand and coarse aggregate is 1 : n : 2n by volume. So, option C and D both are wrong.
The general expression for the proportions of cement, sand and coarse aggregate is 1 : n : 2n by volume. So, option C and D both are wrong.
(2)
Jayesh said:
1 decade ago
@S.Raghuraman Sir.
Can you please give details as on how we should not encourage 1:2:8 & 1:4:10 mixes in the field and how they would develop honey comb and instability in strength.
Can you please give details as on how we should not encourage 1:2:8 & 1:4:10 mixes in the field and how they would develop honey comb and instability in strength.
Er. Amit goel said:
1 decade ago
Can you please tell us the Grade of 1:2:8. Because this is not a proper graded concrete mix proportion. Coarse aggregate %age is very high so there is 99% chance of aggregation.
Ashar Jami said:
8 years ago
I think both D & E are correct answer because according to arbitrary method of proportioning. The proportioning should be 1:n:2n.
S.Raghuraman said:
1 decade ago
We should not encourage 1:2:8 & 1:4:10 mixes in the field since they will develop honey comb and instability in strength.
Santosh said:
1 decade ago
Answer is both D & E because according to arbitrary method of proportioning. The proportioning should be 1:n:2n.
Md samsuzzaman said:
9 years ago
1 : 2 : 8 & 1 : 4 : 10 these are wrong because does not satisfy the general relation 1 : n : 2n.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers