13 Types of Aggregates – According to Size, Shape, Weight and Geological Origin3rd June 2019
13 Types of Aggregates
Following 13 types of aggregates are classified according to their size, shape, unit weight and geological origin:
A. According To Geological Origin
According to the geological origin, aggregates are the following two types:
1. Natural Aggregate
- Example of natural aggregate – Crushed Stone, Gravel etc.
2. Artificial Aggregate
- Example of artificial aggregate – Broken brick, Blust furnace slag etc.
B. According To Size
According to size, aggregates are the following 4 types:
1. Fine Aggregate
It is the aggregate most of which passes through 4.75mm I.S sieve.
- Example of fine aggregate- Natural sand, Crushed stone sand, Crushed gravel sand.
2. Coarse Aggregate
It is the aggregate most of which retained on the 4.75mm I.S sieve.
- Example of coarse aggregate – Crushed stone or gravel.
Combination of coarse & fine aggregates available in nature.
4. Single Size Aggregate
Comprising particles falling within a narrow limit of size.
C. According To Shape
- Round Aggregate.
- Irregular Aggregate.
- Angular Aggregate.
- Flaky & Elongated Aggregate.
D. According To Unit Weight
1. Normal-Weight Aggregate
Sp. Gravity 2.5 to 2.7
- Example of normal-weight aggregate – Sand, Gravels, Crushed rocks etc.
2. Heavy-Weight Aggregate
Sp. Gravity 2.8 to 2.9
- Example of heavy-weight aggregate – Magnetite(Fe3O4), Barytes(BaSO4).
3. Light-Weight Aggregate
Sp. Gravity 1.0 to 1.2
- Example of light-weight aggregate – Sintered fly ash aggregate, expanded shale etc.