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I. S. sieve 2mm has1. Each hole of 2 mm square shape2. Each hole of 2 mm diameter3. Only two holes4. Per cm only two holes

Answer» Correct Answer - Option 1 : Each hole of 2 mm square shape

Concept:

As per I. S. 2386 - Part 1, a sieve size of 2 mm represents that each hole in a sieve is of 2 mm square shape.

According to the ISSC system size of coarse aggregates starts from 0.075 mm or 75 microns and ends at 80 mm.

So sieve of 4.75 mm and 10 mm are normally used for classification in coarse aggregates.

The table below shows the tabular data for different sieve suitable for different sizes of aggregates.

Very coarse soils

Boulder size

 

> 300 mm

Cobble size

 

80 – 300 mm

Coarse soils

Gravel size (G)

Coarse

20 – 80 mm

Fine

4.75 – 20 mm

Sand size (S)

Coarse

2 – 4.75 mm

Medium

0.425 – 2 mm

Fine

0.075 – 0.425 mm

Fine soils

Silt size (M)

 

0.002 – 0.075 mm

Clay size (C)

 

< 0.002 mm

 


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