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Characteristics and Size of Aggregates Used in Construction

Characteristics and Size of Aggregates Used in Construction

Important characteristics of aggregates which influence the properties of the resulting concrete mix are discussed as under:

Composition.

Aggregate containing the constituents which generally react with alkalies in cement cause excessive expansion, cracking of concrete mix, should never be used. The suitability of aggregates should be judged either by studying its service history or by laboratory tests.

Size and shape.

The size and shape of the aggregate particles mainly influence the quantity of cement required in a concrete mix and ultimately the economy of the concrete. For the preparation of economical concrete, one should use the largest coarse aggregates feasible for the structure.

Characteristics and Size of Aggregates Used in Construction

No.

Type of structure

Max. Size of aggregate

1.

Mass concrete work. i.e. dams, retaining walls, piers, and abutments, etc.

40mm

2.

R.C.C work.  i.e. beams, columns, etc

20mm

3.

Flooring

10mm

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It may be clearly noted that the size and shape of the aggregate particles influence the properties of freshly mixed concrete more as compared to those of hardened concrete.


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About Raja Junaid Iqbal

Hi My name is Raja Junaid Iqbal and i am Land Surveyor by Profession but I've specialized in the field of Q,S and land development. As Professional Surveyor I engaged my self in all over the Gulf since 14 years.

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