Gradation Of Fine Aggregates

THEORY & IMPORTANCE:

This experiment is carried out to find and check the gradation of the fine aggregate i.e. sand. The concrete consists of three basic solid materials, one is the sand whose fineness is checked by experiment no 1, the other two materials are the coarse aggregate that is the crush while the third is the fine aggregate that is the sand.
As there are different types of sand, so we will have to judge that which type of sand is the best to be used. The sand is differentiated on the basis of its gradation. The sand will be called graded if it consists of particles having a variety of dimensions; such type of sand is recommended for use because this type of sand will posses the capability to form a compact structure thus will have more strength as compared to fine sand. The fine sand will also form compact structure but will increase the amount of water needed in concrete, which will decrease the strength of the concrete.
So the degree of gradation will decide about the sand to be used. Degree of gradation is also called fineness modulus of sand. We find fineness modulus and compare it the standard recommended values.

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