Answer to Question #300893 in Civil and Environmental Engineering for Glady_7

Question

Define the fineness modulus of aggregate. What is it used for?

Answer 1

Fineness modulus is an empirical value calculated by adding the cumulative percentages of aggregate samples maintained on each sieve (from 150 microns to 80 mm) and dividing by 100.

The coarser the aggregate, the higher the F.M value.

The fineness modulus is used in the following applications:

·        When developing concrete mixes, it is utilized to specify the amounts of fine and coarse aggregate.

·        It refers to the aggregate particle's average size.

·        It's used to estimate how much water is needed in the concrete mix.

·        It offers crucial information regarding the density and compressive strength of the finished concrete.

·        It has an impact on the concrete mix's workability.