13 Types of Aggregates According to Size, Shape, Weight & Geological Origin - Civil Engineering

Monday, June 3, 2019

13 Types of Aggregates According to Size, Shape, Weight & Geological Origin

13 Types of Aggregates

Following 13 types of aggregates are classified according to their size, shape, unit weight and geological origin:
12 Types of Aggregates
12 Types of Aggregates

A. According To Geological Origin

According to 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.
3. All-in-aggregate - 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

1. Round Aggregate.
2. Irregular Aggregate.
3. Angular Aggregate.
4. 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.
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