- 1 13 Types of Aggregates
- 1.1 A. According To Geological Origin
- 1.2 B. According To Size
- 1.3 C. According To Shape
- 1.4 D. According To Unit Weight
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.