Classification of coarse aggregate based on size

June 30, 2017
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Fine aggregate:

The aggregate which pass through 4.75 mm sieve is called fine aggregate. In step with supply fine aggregate could also be represented as:

  • Natural Sand: it’s the combination ensuing from the natural disintegration of rock and that has been deposited by streams or glacial agencies
  • Crushed Stone Sand: it’s the fine mixture created by crushing arduous stone.
  • Crushed Gravel Sand: it’s the fine mixture created by crushing natural gravel.

According to size the fine aggregate could also be represented as coarse sand, medium sand and fine sand. IS specifications classify the fine aggregate into four sorts in step with its grading as fine aggregate of zone 1 to zone 4. The four grading zones become more fine from Zone-1 to Zone- 4. 90% to 100% of the fine mixture passes 4.75 mm IS sieve and 0% to 15% passes 150 micron IS sieve depending upon its grading zone.

Fig: Fine aggregate

COARSE AGGREGATE:

The aggregate which retains or does not pass through 4.75 millimeter IS sieve is called coarse aggregate. In step with supply, coarse mixture could also be represented as:

Uncrushed Gravel or Stone: it results from natural disintegration of rock

Crushed Gravel or Stone: it results from crushing of gravel or arduous stone.

Partially Crushed Gravel or Stone: it’s a product of the mixing of the on top of 2 mixture.

According to size coarse aggregate is determined by ranked mixture of its nominal size i.e. 40 mm, 20 mm, 16mm and 12 mm etc

A coarse aggregate which all aggregate passes through a singe IS sieve then it is called coarse aggregate. Example: if 20 mm single size aggregate mean an aggregate most passes through 20 mm IS sieve and its major portion is retained on 10 mm IS sieve.

Fig:Coarse aggregate

All in size aggregate:

It is the aggregate combination of both fine aggregate and coarse aggregate. In keeping with size All-in-aggregate is determined as all-in-aggregates of its nominal size i.e. 40mm, 20mm etc.

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