SSC JE Civil Engineering 2018 Set 3 Solved Paper

Question : 110 of 200

Marks: +1, -0

Calculate the proportion (in percentage) of fine aggregate in combined aggregate so that the fineness modulus of the combined aggregate becomes 6.4. The fineness modulus of coarse aggregate and fine aggregate in the concrete mix is 7.6 and 2.8 respectively.

20
33.33
35
66.6

Validate

Solution:

x = FN of Coarser aggregrate = 7.6
y = FN of finer aggregrate = 2.8
z = FM of combined mix = 5.4
% of finer aggregrate =

({x-y}/{z-y})×100

({7.6 -6.4}/{6.4-2.8})×100

= 33.33%

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