Grain Size distribution of coarse aggregate

Objective
To determination of particle size distribution of coarse aggregates by sieving

 

Apparatus
Sieves conforming to IS : 460-1962 Specification of 80 mm, 40 mm20 mm, 10 mm, 4.75mm, Balance, Gauging Trowel, Stop Watch

Theory

Grading refers to the determination of the particle-size distribution for aggregate. Grading limits and maximum aggregate size are specified because grading and size affect the amount of aggregate used as well as cement and water requirements, workability, pumpability, and durability of concrete. In general, if the water-cement ratio is chosen correctly, a wide range in grading can be used without a major effect on strength. When gap-graded aggregate are specified, certain particle sizes of aggregate are omitted from the size continuum. Gap-graded aggregate are used to obtain uniform textures in exposed aggregate concrete.

Procedure

1. The sample shall be brought to an air-dry condition before weighing and sieving. This may be achieved either by drying at room temperature or by heating at a temperature of 100°C to 110°C. The airdry sample shall be weighed and sieved successively on the appropriate sieves starting with the largest.

2. Material shall not be forced through the sieve by hand pressure.

3. On completion of sieving, the material retained on each sieve, together with any material cleaned from the mesh, shall be weighed.

4. Material shall not be forced through the sieve by hand pressure.

5. On completion of sieving, the material retained on each sieve, together with any material cleaned from the mesh, shall be weighed.

Observation :

I S Sieve	Weight Retained on Sieve	Percentage of Weight Retained (%)	Percentage of Weight Passing (%)	Cumulative Percentage of Passing (%)	Remark
80 mm
40 mm
20 mm
10 mm
4.75 mm
Total

 Result :

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