Civil Engineering - Concrete Technology - Discussion
Discussion Forum : Concrete Technology - Section 1 (Q.No. 29)
29.
If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
Discussion:
44 comments Page 4 of 5.
Vinod said:
9 years ago
Fineness modulus of given course aggregate is 740/100 =7.4.
Sanu sonkamble said:
9 years ago
Thanks Kishorn & Jagadeesh.
Jagadeesh said:
10 years ago
Sieve weight % weight cumulative.
80 0 0 0.
40 2 10 10.
20 8 40 50.
10 6 30 80.
7.5 4 20 100.
4.75 0 0 100.
2.36 0 0 100.
1.18 0 0 100.
600 0 0 100.
300 0 0 100.
150 0 0 100.
-----------------
Total = 740.
-----------------
Fineness modulus of given course aggregate is 740/100 = 7.4.
80 0 0 0.
40 2 10 10.
20 8 40 50.
10 6 30 80.
7.5 4 20 100.
4.75 0 0 100.
2.36 0 0 100.
1.18 0 0 100.
600 0 0 100.
300 0 0 100.
150 0 0 100.
-----------------
Total = 740.
-----------------
Fineness modulus of given course aggregate is 740/100 = 7.4.
Nirav Bhatt said:
1 decade ago
Pass Wt Cum Wt. %Cum %cum.
Retained % passing.
0 0 0 100.
2 2 10 90.
8 10 40 50.
6 16 30 20.
4 20 20 0.
--- --- --- ---.
20 48 100 260.
Sieves used are 10.
Hence FM = (10*100-260)/100 = 7.4.
In method suggested by @Kishor, the total is done individually for each sieve where as here it is done by using the nos. sieve.
Both the methods are correct. So the Answer is 7.4.
Retained % passing.
0 0 0 100.
2 2 10 90.
8 10 40 50.
6 16 30 20.
4 20 20 0.
--- --- --- ---.
20 48 100 260.
Sieves used are 10.
Hence FM = (10*100-260)/100 = 7.4.
In method suggested by @Kishor, the total is done individually for each sieve where as here it is done by using the nos. sieve.
Both the methods are correct. So the Answer is 7.4.
Hardik said:
1 decade ago
Approximately maximum near by value is taken as A answer.
Snehal Nikam said:
1 decade ago
How it is possible?
Nikita said:
1 decade ago
Please tell me how you get the sum 740?
Nitin said:
1 decade ago
Yes the answer should be 7.40 means option C is correct.
Tanu said:
1 decade ago
But here both 7.35 and 7.40 options are given. Finally what will we do?
Rohan said:
1 decade ago
But the answer is nearly to correct so answer is true.
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