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Particle Size Distribution (Gradation):
The particle size distribution is determined by passing the aggregates through a set of standard IS sieves (Figure) and determining the percentage passing the sieve.
Figure: Sieve Analysis of an Aggregate Sample
The result is expressed as in Table below.
Table: Typical Gradation of Aggregates
Generally, coarse aggregates are those that are retained substantially on 4.75 mm sieve, and fine aggregates are those passing substantially 4.75 mm sieve.
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