# WHAT IS ANGULARITY NUMBER OF AGGREGATE?

## Angularity Number

Angularity number is used to give an indication of shape of aggregate. The concept of angularity number was suggested by Shergold. It gives a qualitative representation of shape of aggregate.

## Angularity Number Test

Angularity number test gives an idea of how angular the aggregate is. This is based on the percentage of voids in the aggregate after compaction in a specified manner.

In angularity number test, a quantity of single sized aggregate is filled into metal cylinder of 3 liter capacity. Then the aggregate is compacted in a standard manner and the percentage of void found out. To know the detail procedure click here.

If the void content of the aggregate is 33% the angularity of such aggregate is considered 0. If the void is 44%, the angularity number of such aggregate is considered 11.

## Importance of Angularity Number

• The normal aggregate which are suitable for making concrete may have angularity number anything from 0 to 11.
• Angularity number 0 represents the most practicable rounded aggregate
• Angularity number 11 indicates the most angular aggregate that could be used for making concrete.
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