Question

If the fineness modulus of fine aggregate is 2.51, it can be graded as:

• A. Fine sand
• B. Medium sand
• C. Very fine sand
• D. None of the above

Answer 1

The correct option is A Fine sand

S.No	Type of speed	Fineness Modulus
1.	Fine sand	2.2 - 2.6
2.	Medium sand	2.6 - 2.9
3.	Coarse sand	2.9 - 3.2

Fineness modulus is a numerical index of fineness that gives an idea about the mean size of particles in sand and aggregate.

Sand having a fineness modulus greater than 3.2 is not considered to be suitable for the preparation of concrete.