Artificial Materials (Aggregate)
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Artificial Materials (Aggregate):-
What is Aggregate?
It is inert or chemically inactive materials
which constitute 70-75% of total volume of concrete.
- The properties of concrete largely depend upon its constituents.
- So the aggregate used in concrete should be hard, durable, strong and free from clay and organic matter.
What are the types of Aggregate on basis of size?
Fine aggregate: The material below 4.75mm
size is known as fine aggregate.
- It should not contain more than 10% silt particles.
- Usually natural river sand is used as fine aggregate.
- But in case natural sand is not available at that case finely crushed stone is used as fine aggregate.
Coarse aggregate: The material retained on
sieve 4.75mm size is called as coarse aggregate.
- The broken stone is generally used as coarse aggregate.
- The maximum size of coarse aggregate is limited to one third thickness of the concrete section.
What is artificial sand?
- It is produced by crushing of stones obtained from rock.
- Need of artificial sand is arises due to non-availability of good river or natural sand.
- The natural river sand requires transportation from long distances, whereas artificial sand can be produced in local area.
- The particles of artificial sand are angular in shape which produces good quality of mortar.
What are the properties of artificial sand?
- It is angular in shape.
- It should be free from clay and silt.
- It should have high crushing value.
- It manufactured from hard igneous rocks.
What are the advantages of artificial sand?
- It is not removed from river, which is good from environmental point of view.
- Transportation cost can be saved by manufacturing sand locally.
- Cost is less as compare to natural sand.
What is the suitability or uses of artificial sand?
- It is suitable for making mortar.
- It is suitable for making concrete.
- It used in road construction.
- It used in manufacturing of precast concrete products.
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