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1. SUBMITTED BY:-
ANVESH MITTAPELLI
SECTION-B
20C35A0141
A SEMINAR REPORT ON LIGHT WEIGHT
CONCRETE
BALAJI INSTITUTE OF TECHNOLOGY
& SCIENCE
DEPARTMENT OF CIVIL
ENGINEERING
4-1 SEMESTER
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2. LIGHT WEIGHT CONCRETE
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3. CONTENTS
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 LIGHT WEIGHT CONCRETE
 INTRODUCTION
 TYPES OF LIGHT WEIGHT CONCRETE
 LIGHT WEIGHT AGGREGATE CONCRETE
 ARTIFICIAL LIGHT WEIGHT AGGREGATE
 MIXING PROCEDURE
 ADVANTAGES
 CONCLUSION

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5. Defination Concrete having a 28-day compressive strength greater than 17 Mpa
and an airdried unit weight not greater than 1850 kg/m³.
Composition: Similar to normal concrete except that it is made with lightweight
aggregates or combination of lightweight and normal-weight aggregates. All
lightweight concretes use both lightweight coarse and lightweight fine
aggregates. Standard lightweight concretes used natural sand instead of
lightweight fine
aggregates.
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LIGHT WEIGHT CONCRETE

6. ▶ Light weight concrete is a special concrete which weighs lighter than
conventional concrete.
▶ Density of this concrete is considerably low (300 kg/m3 to 1850 kg/m3) when
compared to normal concrete (2200kg/m3 to 2600kg/m3).
▶ Basically there is only one method for making concrete light i.e by INCLUSION of
air in concrete. This is achieved in actual practice by there different ways
i)By replacing the usual aggregate by cellular porous or LWA ii)By
introducing gas or bubbles in mortar-aerated concrete
iii)By omitting sand fraction from the aggregate-no fines concrete
▶ Light weight aggregate concrete - UK, France & USA
▶ Aerated concrete - Scandinavian countries
▶ No – fines concrete is less popular
Introduction
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7. LWC can also be classified on the purpose for which it is used
such as:
1. Structural light weight concrete
2. Non-load bearing concrete
3. Insulating concrete
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TYPES OF LIGHT WEIGHT CONCRETE

8. Light weight aggregate concrete:
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▶ Basically two types of light weight aggregates
▶ Natural aggregates
▶ Artificial aggregates
▶ Natural light weight aggregates are less preferred over
artificial aggregates.
▶ Important natural aggregates – Pumice & Scoria
▶ Type of aggregates decides the density of concrete.
▶ Density of concrete as low as 300 kg/m3 can be achieved.
▶ Compressive strength varies from 0.3Mpa to 40Mpa.

9. • Brick bats
• Cinder, Clinker and
breeze
• Foamed slag
• Bloated clay
• Pulverised fuel ash
• Expanded perlite
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ARTIFICIAL LIGHT WEIGHT AGGREGATE

10. MIXING PROCEDURE:
• Mixing procedure for light weight concrete
may vary with different types of aggregates
The general practice for structural light weight
concrete is to mix the aggregate and about 2/3 of
the mixing water for period up to one minute prior
to the addition of cement and the balancing
mixing water.
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11. ▶ Reduces the dead load of the building.
▶ Easy to handle and hence reduces the cost of transportation and
handling.
▶ Improves the workability.
▶ Relatively low thermal conductivity
▶ Comparatively more durable. But less resistant to abrasion.
▶ Has applications in pre-stressed concrete, high rise buildings & shell
roofs.
▶ Good resistance to freezing & thawing action when compared to
conventional concrete.
▶ Helps in disposal of industrial wastes like fly ash, clinker, slag etc.
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ADVANTAGES

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CONCLUSION:-
The lightweight concrete is more times better
than normal concrete due to its density,
compressive strength, flexural strength and
its overall physical/mechanical properties.
Hence LWC is economical than NWC and it
definitely use as a best construction material.

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