Function of fine aggregates and course aggregates in concrete

  Fine Aggregates Functions :

1) It fills the voids existing in coarse aggregate.

2)It reduces shrinkage and cracking of concrete.
3)By varying, the proportion of sand concrete can be prepared economically for any required strength.
4)It helps in hardening of cement by allowing the water through its voids.
5) To form the hard mass of silicates as it is believed that some chemical reaction takes place between the silica of sand & constituents of cement.

Coarse Aggregates Functions :

1)Coarse aggregate makes solid & hard of concrete with cement & sand.

2)It increases the crushing strength of concrete.

3)It reduced the cost of concrete since it occupies the major volume.