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Aggregates is a general term applied to those inert (that is chemically inactive) materials, which when bonded together by cement, form concrete. Most are used in our country are naturally occurring such as sand, crushed rock and gravels. Artificial and processed aggregate may also be use for making concrete. This may be broken bricks or crushed air-cooled blast furnace slag.
Light weight aggregates, which are usually by-products of industries and are processed from natural sources or natural materials have a high percentage of voids and are, therefore, light such as pumice, furnace, clinkers, coke breeze, saw dust, foamed slag, expanded clays, and shales, expanded slates, etc., These are also used for the production of concrete of low density. The workability of concrete with lightweight ones and is greatly increased with air-entraining agents, and hence the use of many light weight aggregates is being made in concrete where high strength is not desired.
Classification
Aggregates for concrete are divided in to three categories,
1. Fine Aggregates: Most of which passes through 4.75 mm I.S. sieve and are retained on 150 micron sieve.
2. Coarse Aggregates: Most of which passes through 63 mm I.S. sieve and retained on 4.75 mm sieve.
3. All in Aggregates: Mixed aggregates, as it comes from the pit or riverbed. It is sometimes used for unimportant work without separating in to different sizes.
Uses
1. Naturally occurring crushed stone can be used for producing any type of good concrete or R.C.C for construction purposes.
2. Broken bricks are used for water-proof construction.
3. Light weight aggregates are used to produce low density.
Classification
Aggregates for concrete are divided in to three categories,
1. Fine Aggregates: Most of which passes through 4.75 mm I.S. sieve and are retained on 150 micron sieve.
2. Coarse Aggregates: Most of which passes through 63 mm I.S. sieve and retained on 4.75 mm sieve.
3. All in Aggregates: Mixed aggregates, as it comes from the pit or riverbed. It is sometimes used for unimportant work without separating in to different sizes.
Uses
1. Naturally occurring crushed stone can be used for producing any type of good concrete or R.C.C for construction purposes.
2. Broken bricks are used for water-proof construction.
3. Light weight aggregates are used to produce low density.
