Saptagon Asia Private Limited

A sieve analysis (or gradation test) is a practice or procedure used in geology, civil engineering and chemical engineering to assess the particle size distribution (also called gradation) of a granular material by allowing the material to pass through a series of sieves of progressively smaller mesh size and weighing the amount of material that is stopped by each sieve as a fraction of the whole mass.

It is used to determine the permeability or hydraulic conductivity of soil samples. It measures the rate at which water flows through a soil specimen under a controlled hydraulic gradient. Common types include the constant head and falling head permeability tests, which are used for granular and fine-grained soils, respectively.