Question

If in a concrete mix the fineness modulus of coarse aggregate is 7.6, the fineness modulus of fine aggregate is 2.8 and the economical value of the fineness modulus of combined aggregate is 6.4, then the proportion of fine aggregate is

• A. 25%
• B. $33\frac{1}{3}$%
• C. 50%
• D. $66\frac{2}{3}$%

Answer 1

The correct option is A 25%

The proportion of fine aggregate to combined aggregate,

$R=\frac{p_2-p_3}{p_2-p_1}\times 100$

$\therefore R=\frac{7.6-6.4}{7.6-2.8}\times 100=25$%