What is concrete?
What is cellular light weight concrete?
Placing of CLC
Tests on CLC
CLC is a version of light weight concrete .
Provides an effort of improving environment by
conversion of waste into useful building product.
CLC=Cement slurry +Sand +fly ash +water
+Preformed stable foam.
Density range 400kg/m3 – 1800kg/m3.
Helps in reduction of dead weight of structures.
WHAT IS CONCRETE?
Widely used building material.
Concrete= Cement +Sand +Aggregate +Water.
Can be moulded into durable structural items of
various sizes and shapes.
Quantity of ingredients control the properties of
concrete in wet and dry state.
WHAT IS CELLULAR LIGHT WEIGHT
Foam creates millions of tiny voids in the
Foam flows easily into all corners – so
vibrations for compaction not required.
CLC is poured or pumped into assembled
moulds or formwork of RCC elements.
Accelerates pace of construction.
Neopor foam causes no chemical reaction in the
concrete but serves as a wrapping material for air
The foaming agent warrants high stability for the foam
and withstands the forces occurring when mixing ,
conveying, casting, and hydration process.
1 kg of foaming agent diluted in 4o liters of water
yields approximately 540 liters of foam.
foaming agent is bio degradable, non-toxic, non-
FOAM GENERATOR 7
MOBILE NEOPOR UNIT
Required quantity of cement,sand,and water are fed into
the concrete mixer at project site and mixed well.
Fly ash of specified quality is added next. Fly ash content is
between 1/3rd to 1/4th of total raw materials depending on
the target density of the final product.
Neopor foam produced at site is fed into the concrete mixer
and mixed well.
Foam produced is stable for a time duration far beyond the
final setting time of cement thereby creating permanent
voids in the final hardened mass.
This mix can be used for making precast blocks or for
PLACING OF CLC
CLC used in multistory
buildings is pumped or
transported to the job site.
Then the concrete is spread
to proper thickness usually
between 1.5 to 1.6 inches .
Darby and trowel is used
to produce a flat surface.
PLACING OF CLC
TESTS ON CLC
Specimen is placed in 3x6 inch cylinders for testing.
Protect the test cylinders from weather and
disturbance after casting.
After 24 hours, cure the specimen with moisture for 7
days and then dry cure them for another 21 days.
The cylinder is then tested in the same manner as for
ordinary concrete cylinders.
The crushing strength is obtained finally.
PROPERTIES OF CLC
More versatile material than other versions of light weight
Can be produced in wider density range.
Can be precast or cast in-situ.
Lower water absorption.
Easy to produce.
Light weight with superior thermal and sound insulation.
Ease of working with CLC.
Resistance to corrosion.
MOULD PRECAST CLC BLOCKS 15
UNIQUE FEATURES OF CLC
Very simple method of production.
Easily adopted in pre cast plants or even at the project
Requires nominal investment only.
Cheaper and environment friendly.
Only normal concrete mixers required.
Ordinary moulds can be used.
Unskilled laborers only.
Can be made into pre cast elements whether
reinforced or unreinforced.
Reduction of dead load.
Saving in transportation cost.
Ease of handling.
Ease of construction in hilly areas.
Saves energy and reduces pollution.
Sl no Parameters CLC Burnt Concrete
1. Basic raw Cement, Top Cement,
materials sand, agricultur sand,
flyash, al soil, aggregate
2 Production Ordinary Specially Mobile/St
process concrete erected or ationary
mixer , central plant
3 Dry density 400-600 1900 1700
Sl no Parameters CLC Burnt Concrete
4 Compressive 5-10 40-125 30-150
5 Precast block 500 x 250 229 x 114 x 400 x 200
size x 100/190 70 mm x 200 mm
6 Cast in place Any shape Not Not
and size feasible feasible
7 Compaction none yes Yes
8 Sound superior normal Better
9 Eco Pollution Create No smoke
friendliness free smoke
Higher density range:
density ranges from 1200 to 1800 kg/m3.
It is utilized for construction of load carrying
structural elements like walls, suspended floors or
Reinforced CLC Load bearing walls for the 4 storey dwellings -
Medium density range:
Density ranges from 800 to 1000 kg/m3.
Utilized for making precast blocks for non load
bearing walling masonry for internal/external walls in
They also make it feasible to do dry fixing of door or
window frames- saves time in fixing and grouting
CLC blocks of density 1000kg/m3 used in south towers south of New Delhi. 21
Lower density range:
Density ranges from 400-600 kg/m3.
Ideal for thermal insulation applications.
Ideal for laying sound insulating layer over
structural slabs of intermediate floors in high class
hotels and institutional buildings.
SOME CLC DEVELOPMENTS IN INDIA
BEVERLY PARK II REGENCY TOWERS
RICHMONDPARK HAMILTON COURT,DLF
Fly ash CLC is a far superior alternative to factory
made aerated concrete or man made light weight
CLC has diverse applications and properties some of
which cannot be offered by conventional alternatives.
It is an environment friendly and energy efficient
material which is the need of the day.
It is therefore no surprise that more and more
builders are progressively opting this material in their
Site produced cellular light weight concrete-a boon for
housing. paper presented at CIDC conference,
New Delhi sept.2004(by G.B.Singh)
Relevance of fly ash based CLC for greener buildings and
environment. paper presented at Architectural Engg.
Institute of ASCE ,Austin ,Texas, sept 2003(by G.B.Singh)
Concrete technology.(by M.S.Shetty)
Basic concrete engineering for builders, vol 1(by Max
Significance of tests and properties of concrete and
concrete making materials.(by Joseph .F. Lamond and