Krishna Ashtech CLC Pvt. Ltd.

swimminghersheyUrban and Civil

Nov 25, 2013 (3 years and 10 months ago)

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By:
-

Krishna
Ashtech

CLC Pvt. Ltd.

Cop Off: 12/49, Near TOI Press,Site
-
4,

Sahibabad Industrial Area,

Sahibabad, U.P. 201010

Email:
info@krishnaashtech.com

Visit on: www.krishnaashtech.com

Ph:
-

09999433225



09999433227





Cellular

Lightweight

Concrete

(CLC)

is

conventional

concrete,

where

natural

aggregate

(gravel)

is

exchanged

for

the

best

insulation

medium

available,

namely

air,

embedded

in

organic

and

bio
-
degradable

foam

that

offers

no

chemical

reaction

but

solely

serves

as

wrapping

material

for

the

air
.

Consequently

CLC

behaves,

like

conventional

concrete,

in

particular

concerning

curing,

hardening

and

most

important

“ageing


.

CLC

infinitely

increases

its

strength

by

hydration

(forming

of

crystals

in

cement)

as

long

as

exposed

to

humidity

in

the

atmosphere
.




For

structural

(steel
-
reinforced)

application,

CLC

is

used

in

densities

of

1
,
000

to

1
,
200

kg/m³,

which,

due

to

the

billion

of

micro
-
sized

and

uniform

air

bubbles

offer

500

%

more

thermal

insulation

and

a

substantially

higher

fire
-
rating

than

conventional

concrete
.

If

a

wall

of

conventional

concrete

should

offer

the

same

thermal

insulation

as

CLC,

the

wall

produced

would

have

to

measure

5

times

thicker

and

therefore

also

use

10

times

more

material

(sand,

gravel,

cement)

to

produce
.

CLC

structures

in

hot

climatic

zones

require

only

1
/
5
th

energy

for

air
-
conditioning

when

compared

to

traditional

clay
-
brick

structures
.




Excellent

compressive

strength

in

excess

of

regular

clay

bricks

/

solid

blocks,

guarantees

min
.



CLC

Bricks

density

is

1000
kg/m
3

which

reduces

dead

load

on

structures
.


Huge

saving

in

foundation

and

structure

savings

on

beam

costs
.


Optimization

of

floor

space

or

coverage
.


Good

earth

quake

resistance

properties
.


Easy

handling
.

Lightweight

CLC

is

easy

to

transport

and

stock
.


Easily

cut

to

custom

size

requirements

on

size

using

basic

power
-
tools
.



Huge

saving

of

labour
.

Faster

construction

directly

relates

to

reduction

in

labour

requirement
.





Highest

thermal

insulation

making

cool

summers

and

warm

winters
.


Reduced

Air

conditioning

expenses
.

AC

energy

requirements

can

be

5

times

lower

than

conventional

structures
.


Fire

resistant
.


Non

toxic

fumes

in

case

of

fire
.


Excellent

acoustic

barrier
.

More

peace

of

living,

no

disturbance

from

your

neighbour’s

home

theatre
.


Highly

accurate

and

smooth

walls

reduction

in

plastering
.


Opt

for

any

finish

on

walls



external

plastering,

tiling,

cladding,

internal

tiling,

dry

lining,

spray

plaster

or

anything

of

your

choice
.


Eco

friendly
.


S.No

Description


Bricks/Block
s

CLC

Saving (%)

1

Density of Material

1900 kg/m3

1000 kg/m3

-

2

Weight of building

(
Incl

Masonry)

42681 KN

34224 KN

20

3

Concrete

(a)
In

superstructure
(excl slab)

(b)
In foundation and
plinth


193.91 m3


198.8 m3


150 m3


159.6 m3


22.60


20

4

Steel

(a)
Superstructure
(excl slab)

(b)
Foundation & plinth


25.9 M.T


27.8

M.T


22.6 M.T


23.34 M.T


12.70


19.70

S.No

Description

Bricks/Block
s

CLC

Saving (%)

5

Plaster

(a)
15 mm 1250 m2

(b)
20 mm 1250 m2


0.95 L

(12mm)

1.16 L (12mm)


0.82 L

0.82 L


14

29.30

6

Shuttering

(Reduced sizes of
Members)

X

m2

0.75 X m2

25









1CLC BLOCK=14.5 BRICKS

500*250*200


Parameter for 10
m2

wall

Brick wall

CLC Block
Masonry

CLC %
Advantage

No. of Units

116

8

93%

Mortar for Masonry

0.58 M3

0.014 m3

74%

Labour
-

Skilled.


-

Un Skilled

1.98 Masons

3.68 Coolie

0.51 Masons

1.66 Coolie

74%

55%

Weight

of Wall

4485 Kg

2000 kg

55%

S.
N.

Parameters

CLC

Burnt Clay Bricks

1

Basic

Raw

Materials

and

Other

inputs

Cement,

Sand,

Flyash
,

water

&

Foaming

agent

Top

agricultural

soil,

energy


2

Production

process

and

set
-
up

Can

be

produced

at

project

site

using

ordinary

concrete

mixer

and

foaming

generator

Processed

in

specially

erected

or

central

brick

kilns

3

Dry Density kg/m3

400

800
-
1000

1200
-
1800

1900

4

Usage

Insu
latio
n

Partition,

low

rise

load

bearing

RCC

Element

Load

Bearing

and

Non

Load

Bearing

5

Pre cast Block Size


500

X

250

X

100
/
200

mm

229
X
114
X
70
mm

6

Cast
-
in
-
place

Any

shape

&

size

400
-
1800

kg/m
3

In

density

range

Not

Feasible

7

Ageing

Gains

Strength

with

age

as

ordinary

concrete

May

deteriorate

with

age

S

No.

Parameters

CLC

Burnt Clay Bricks

8

Thermal
conductivity

0
.
098

for

400

kg/m
3

0
.
151

for

700

kg

/
m
3

0
.
238

for

1000

kg/m
3

0.811

9

Sound Insulation

Superior

Normal

10

Ease of Working

Can be cut,

sawn, nailed,
drilled

Normal

11

Eco Friendliness

-
Pollution Free

-
Least energy required

-
Can consume

fly
-

26% to 33%

-
Process creates

smoke

-
Uses high energy
& waste
agricultural land

Block Size

(mm)

Block Size

(inches)


Approximate

Weight/block
(kg)

No. of Blocks /
m3

600*200*225

24*8*9

27

37

600*200*200

24*8*8

24

41

600*200*150

24*8*6

18

55

600*200*100

24*8*4

12

83

500*200*225

20*8*9

22.50

44

500*200*200

20*8*8

20

50

500*200*150

20*8*6

15

67

500*200*100

20*8*4

10

100


Because one size doesn't fit all



The

Nominal

dimensions

of

CLC

blocks

are

600
mm

in

Length,

200
mm

in

height

and

can

vary

from

100
mm,

125
mm,

150
mm,

200
mm

&

300
mm

in

width
.


Note
:

The

maximum

variation

in

the

length

of

units

shall

not

be

more

than

5
mm

cmd

maximum

variation

in

height

and

width

of

the

unit

not

more

than

3
mm

&

is

acceptable

as

per

I
.

S
.

Standards
.

CLC

blocks

are

a

substitute

for

ordinary

&

dense

concrete

blocks
.

This

versatile

material

can

be

produced

to

desired

specifications

in

a

wide

range

of

densities

from

400

kg/Cu
.

M
.



1800

kg/Cu
.

M
.
,

as

per

specifications
.


CLC

is

an

air
-
cured

lightweight

concrete

that

can

be

produced

at

project

site,

utilizing

equipment

and

moulds

normally

in

use

for

conventional

concrete
.

CLC,

like

conventional

concrete

ages

well,

increasing

its

strength

by

as

much

as

50
%

(!)

between

28

and

90

days

after

pouring,

As

long

as

CLC

draws

humidity

from

the

atmosphere

it

will

keep

on

increasing

its

mechanical

properties
.



Required Equipment



Foam Generator


Conventional Mixers


Air Compressor


Conventional moulds, horizontal/vertical /Trolley






Raw

Material


Fine

Sand


Cement

(
53

grade

OPC)


Fly

Ash


Foaming

Agent


Mould

Releasing

Agent


Water


Curing

of

CLC

takes

place

within

the

same

period

as

conventional

concrete
.

If

cast

in

the

evening,

the

concrete

can

be

demolded

next

morning
.

Curing

can

be

speeded

up

by

either

heat,

steam

or

chemical

(
accelera

-

tors
)
.

-

As

in

conventional

concrete

CLC

may

also

be

coloured

(adding

pigments)
.



CLC

Bricks

are

available

in

3

grade

strengths
:


Grade

A
:

These

are

used

as

load

bearing

units

&

have

a

brick

density

in

the

range

of

1
,
200

kg/Cum



1
,
800

kg/Cum



Grade

B
:

These

are

used

as

non
-
Load

bearing

units

&

have

a

brick

density

in

the

range

of

700



1
,
000

kg/Cum
.



Grade

C
:

These

are

used

for

providing

thermal

insulation

&

have

a

brick

density

in

the

range

of

400



600

kg/Cum
.



The

blocks

for

masonry

work

would

conform

to

the

stipulations

of

IS
:

2185

(Part
-
4
)

:

2008

and

those

for

thermal

insulation

would

satisfy

the

requirements

of

IS
:

6598

(Part
-
4
)

:

2008

.



TYPE

DENSITY KG/M3

MINIMUM
CONPREHENSIVE
STRENGTH N/MM2

WATER
ABSORPTION

GRADE
-
A

1800


1600


1400


1200

25.0


17.5


12.0


6.5

7.5


7.5


10.0


10.5

GRADE
-
B

1000


800

3.5


2.5

12.5


12.5

GRADE
-
C

600


400

1.0


0.5

15.0


15.5




Density

300
-
600

kg/m³
:

This

density

is

primarily

applied

for

thermal

insulation

or

fire

protection
.

It

uses

only

cement

(or

little

flyash
),

water

and

foam

and

can

easily

be

pumped
.

Foam

generators

allow

the

production

of

stiff

foam

for

slopes

to

be

applied

on

roof
-
tops
.


Density

700
-
800

kg/m³
:

Is

also

used

for

void
-
filling,

such

as

an

landscaping

(above

underground

construction),

to

fill

voids

behind

archways

and

refurbishing

of

damaged

sewerage

systems
.

It

is

also

been

used

to

produce

building

blocks
.


Density

900
-
1100

kg/m³
:

Serves

to

fore

mostly

produce

blocks

and

other

non
-
load

bearing

building

elements

such

as

balcony

railings,

partitions,

parapets

and

fence

walls

etc
.


Density

1200
-
1400

kg/m³
:

Are

the

most

commonly

densities

for

prefab

and

cast

in

situ

walls,

load
-
bearing

and

non
-
load
-
bearing
.

It

is

also

successfully

used

for

floorscreeds

(sound

and

insulation

plus

weight

reduction)
.


Density

1600
-
1800

kg/m³
:

would

be

recommended

for

slabs

and

other

load
-
bearing

building

elements

where

higher

strength

is

obligatory
.



Cellular

Lightweight

Concrete

(CLC)

is

excellent

for

strong

yet

light

walls,

noise

insulating

floors

and

leak

proof

roofs

CLC,

also

known

as

foamed

concrete

or

cellular

concrete

is

not

an

autoclaved

aerated

concrete

(AAC)

product,

it

is

conventional

concrete

with

a

wide

range

of

densities,

choice

of

aggregates

and

mix

designs
.





It

is

widely

used

in

the

manufacture

of

single

skin

lightweight

concrete

wall

panels,

employing

tilt
-
up

construction
.

This

is

an

ideal

situation

for

the

manufacture

of

light

commercial

structures

and

factories

as

well

as

residential

housing
.





With

the

rise

in

population

and

increase

in

constructional

activities

considering

the

improvement

in

the

standard

of

living

the

demand

for

building

bricks

is

increasing

day

by

day
.




The

tremendous

savings

described

when

using

CLC

are

manifold
.


Savings

in

Raw

Material
:



Blocks

products

reduce

dead

weight

of

filler

walls

in

framed

structures

by

more

than

50
%

as

compared

to

brickwork

resulting

in

substantial

savings
.

Due

to

the

bigger

and

uniform

shape

of

blocks,

there

is

a

saving

in

bed

mortar

and

plaster

thickness
.

Considering

that

a

substantial

amount

of

steel

is

necessary

only

to

carry

the

weight

of

the

structure,

steel

requirement

might

reduce

by

hundreds

of

ton

in

high

rise
.



Considerably

Lower

Weight
:



Weight

reduction

is

obvious

in

transport,

where

almost

double

of

volume

of

building

material

can

be

produced
;

it

has

an

impact

on

craning,

where

either

larger

panel

can

be

taken,

or

the

full

capacity

in

span
.

Alternatively

less

re
-
location

of

the

crane

is

necessary
.



Thermal

Insulation
:



Thermal

Insulation

increasingly

turns

to

be

the

most

important

issue

in

the

planning

and

construction

of

buildings
.

There

are

many

costly

ways

of

insulation

on

sandwich

structure

of

a

wall,

adding

the

one

or

another

rigid

insulation

material,

with

a

satisfactory

result

by

computation

but

not

always

a

sound

solution

in

safety,

health

or

environment
.

The

best

solution

is,

to

incorporate

thermal

insulation

in

the

mix

of

a

concrete,

such

offered

in

air
-
cured

CLC
.



Excellent Acoustic Performance
:


Blocks

has

excellent

acoustic

performance

and

can

be

used

as

effective

sound

barrier

and

for

acoustic

solutions
.

Hence,

it

is

highly

suitable

for

partition

walls,

floor

screens

/

roofing

and

panel

material

in

auditoriums
.




Fire

Protection
:



The

air
-
embedded

in

the

CLC

is

also

instrumental

for

the

high

fire
-
rating
.

In

1200

kg/m³

density

a

13
-
14

cm

thick

wall

has

a

fire

endurance

of

5

hours
.

The

same

delay

occurs

with

a

400

kg/m³

layer

of

CLC

in

only

10

cm

thickness
.

CLC

is

otherwise

non
-
combustible
.



Sound

Insulation
:



Over

the

efforts

to

keep

on

increasing

the

thermal

capacity

of

building

members,

other

aspects

have

been

neglected,

such

as

sound

insulation
.

Sound

is

experienced

as

air
-
borne

or

foot
-
fall

sound

(impact)
.




Insulated

Flooring
:



As

the

impact

force

will

not

transmit,

slabs

produced

of

CLC

or

topped

with

a

layer

of

CLC

floor

screen

will

prevent

any

sound

being

noticed

in

the

room

below
.

Walls

of

CLC

will

also

serve

as

sound

retaining

walls

on

roads

or

railway

tracks

therefore,

absorbing

the

sound

and

preventing

it

from

bouncing

to

the

other

side
.



Workability
:



Blocks

products

are

produced

in

a

rectangular

shape

for

internal

and

partition

walls

or

in

shapes

as

required
.

The

products

are

lightweight,

making

them

easy

to

place

and

secure

using

less

skilled

labour
.

The

bricks

can

be

drilled

and

shaped

like

wood

using

standard

hand

tools,

regular

screws

and

nails
.

It

is

simpler

than

brick

or

concrete
.




Economical

Production
:



Using

only

fly

ash,

cement,

water

and

foam,

the

cost

for

one



of

CLC

in

most

cases

is

less

even

than

for

the

equivalent

volume

of

conventional

concrete
.

Adding

all

the

described

highly

appreciated

benefits

(comprising

CLC)

to

regular

concrete,

if

at

all

possible,

the

cost

for

such

regular

concrete

would

probably

double

but

still

not

reach

the

overall

quality

of

CLC
.



Environment

Friendly
:



Blocks

products

are

manufactured

with

fly

ash

100
%

recycled

resource
.

As

a

building

material,

Cellular

Lightweight

Concrete

products

conserve

fertile

agricultural

soil
.

It

has

a

dramatic

impact

on

emission

of

Green

House

Gases

created

during

cement

manufacturing
.




Lifespan
:



Blocks

products

are

weather

proof,

pest

resistant

and

fire

proof
.



Eco

Friendly
:



CLC

is

remarkably

ecofriendly
.

It

saves

depletion

of

the

top

soil,

while

at

the

same

time

it

can

actually

use

flyash



an

industrial

waste

as

one

of

its

major

constituents
.

The

production

process

of

CLC

or

its

use

does

not

release

any

harmful

effluents

to

ground,

water

or

air

(unlike

smoke

of

brick

kilns

and

ruining

of

top

soil

in

production

of

bricks)
.

CLC

due

to

its

low

weight

is

ideal

for

making

partition

walls
.

The

use

of

CLC

for

this

purpose

will

reduce

the

need

for

plywood

partitions
.

This

consequently

will

result

in

reduction

in

deforestation

and

will

benefit

environment
.


Cellular

Lightweight

Concrete

(CLC)

is

produced

by

the

mixing

of

sand,

fly
-
ash

cement

foam

and

water

in

requisite

proportion

in

ready

mix

plant

or

ordinary

concrete

mixer
.

The

mixed

slurry

is

then

poured

into

moulds

of

pre
-
cast

blocks

/

structural

components

/

assembled

form
-
work

of

building

elements

or

over

flat

roofs

for

thermal

insulation

as

per

I
.

S
.:

6598
.

It

is

essentially

air

cured,

thus

can

be

produced

at

project

site,

utilizing

equipment

and

moulds

normally

in

use

for

conventional

concrete
.

The

foam

is

produced

with

the

help

of

a

Foam

Generator

by

using

a

foaming

agent
.

The

foam

contains

isolated

air

bubbles,

which

creates

million

of

unconnected

tiny

voids/cells

in

the

mix

resulting

in

lighter

weight

of

concrete
.


Structural Capability


CLC,

like

conventional

concrete

ages

well,

increasing

its

strength

by

as

much

as

50
%

(!)

between

28

and

90

days

after

pouring,

As

long

as

CLC

draws

humidity

from

the

atmosphere

it

will

keep

on

increasing

its

mechanical

properties
.

Curing

takes

place

within

the

same

period

as

conventional

concrete
.

If

cast

in

the

evening,

the

concrete

it

could

be

demoulded

the

next

morning
.

Curing

can

be

speeded

up

by

heat,

steam

or

chemical

(accelerators)
.

CLC

is

an

excellent

and

competitive

material

for

low

-
rise,

load
-
bearing

construction

and

outside

walls

as

well

as

partitioning

work

in

multi


storeyed

blocks
.



Appearance

Cellular

Light
-
weight

Concrete

is

very

light

coloured
.

The

addition

of

foam

into

the

concrete

mixture

creates

millions

of

tiny

voids

or

cells

in

the

material,

hence

the

name

cellular

concrete
.

Although

there

is

no

direct

path

for

water

to

pass

through

the

material,

an

appropriate

coating

is

required

to

prevent

water

penetrating

into

the

CLC

material
.

The

quality

of

CLC

production

can

be

controlled

accurately

at

the

project

site,

just

like

Concrete
.

The

surface

finish

depend

upon

the

formwork

and

moulds

used

during

casting
.


Site
Precasting

Of Blocks



Basic

advantage

and

superiority

of

the

technology

envisages

easy

and

trouble

free

manufacturing

of

the

product

at

the

site

of

work
.

The

product

manufactured

at

the

site

shall

be

exclusively

for

in
-
house

consumption

of

the

project
.

All

the

raw

materials

shall

be

supplied

by

the

client
.

Plant,

machinery

and

equipment

are

optional
.

With

this

system

the

price

shall

be

quite

economical

due

to

saving

in

sales

tax

and

transportation

and

utilization

of

all

the

wastages

and

breakages

at

site

for

filling

work

and

construction

of

boundary

walls

etc
.





M/s Krishna
Ashtech

CLC Private Limited

Offices:
-


12/49, Site
-
4, Sahibabad Industrial Area,


Sahibabad, Ghaziabad, U.P.



F
-
114,
Ist

Floor,
Vardhman

Complex, C
-
Block,


Yamuna
Vihar
, Delhi
-
110053


Site:


Vishada

Road, Near
Vishada

Mandir
,
Badhpura
,


Dadri
, G. B. Nagar
-

203207

Phone: 09999433225, 09999433227

Visit on:
www.krishnaashtech.com

Email:
info@krishnaashtech.com






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