Question

Fineness modulus is -

• A. The ratio of fine aggregates to coarse aggregate
• B. The ratio of fine aggregates to total aggregate
• C. An index which gives the mean size of the aggregates used in a mix
• D. None of the above

Answer 1

The correct option is C An index which gives the mean size of the aggregates used in a mix

Fineness modulus is an index number which represents the mean size of the particle in the mix. It is calculated by performing sieve analysis with standard sieves. The cumulative percentage retained on each sieve is added and divided by 100, giving the value of fineness modulus.