LIGHT WEIGHT CONCRETE USES AND TYPES

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WHAT IS LIGHT WEIGHT CONCRETE

Light weight concrete is a concrete which has density much lower than that of ordinary concrete. (300-1850)
Maximum slump for light weight concrete limited to 100 mm
Natural light weight aggregate used in concrete prepared by crushing and sizing natural rocks.

It is define as LWC consisting of coarse aggregate, cement and water without any fine aggregate.

Its compressive strength of no fine concrete lies between 5 and 15 n/mm² which is less than conventional concrete.

Its density depends upon grading of concrete.

The bond strength of no-fine concrete is low and hence the use of reinforcement in walls should be avoided.

The w/c ratio kept low, between 0.4 and 0.45 to ensure the coating of aggregate with cement paste and avoid run-off of the paste.

The C/Agg ratio volume range from 1:6 to 1:8. (1:10 D layer)

No fine concrete should be placed within 20 min after mixing otherwise its workability get reduced.

The concrete prepared by using light-weight aggregate non as LWAC.

Means by using porous lightweight aggregate whose specific gravity less than 2.6 and weight less than about 1000 kg/m³.

A light weight concrete obtained by adding entrained air or other gas into plastic concrete mix is known as cellular or aerated concrete .

Light weight concrete produced by adding foam agent to the mix.

The foam contains isolated air bubbles, which creates million of unconnected tiny voids in the mix resulting in lighter weight concrete.

Dampness problem
As it has uniformed distributed voids, it is not suitable for reinforced or pre-stressed concrete construction.
Mixing time is longer than conventional concrete.

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