LIGHT WEIGHT CONCRETE USES AND TYPES - KPSTRUCTURES.IN

LIGHT WEIGHT CONCRETE USES AND TYPES

In This Article We Covers,

  • What is Light Weight Concrete
  • Types Of Light Weight Concrete
  • Uses Of Light Weight Concrete
  • Advantages Of Light Weight Concrete
  • Disadvantages Of Light Weight Concrete

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.

TYPES OF LIGHT-WEIGHT CONCRETE

  • No-fine concrete.
  • Light weight aggregate concrete.
  • Aerated or foamed concrete.

NO-FINE CONCRETE

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.

LIGHT WEIGHT AGGREGATE CONCRETE

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.

AERATED AND FOAMED CONCRETE

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.

ADVANTAGES OF LIGHT WEIGHT CONCRETE

  • Reduced dead load due less density.
  • Increase progress of work due to less weight.
  • It has good drainage properties due to open texture.
  • Due to absence of fine aggregate, no segregation and capillary moment of water.
  • Produced low cost concrete due to lower cement content. 

DISADVANTAGES OF LIGHT 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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