What is the difference between AAC blocks & CLC blocks?/ AAC blocks Vs. CLC blocks.

 Let us observe the differences between AAC blocks & CLC blocks in a table format.

Sl. no.	Description	AAC blocks	CLC blocks
1.	Raw material	Cement, gypsum, aluminium powder, sand or fly ash, aeration agent.	Cement, sand or fly ash, foaming agent, water.
2.	Price of blocks having same density.	INR 1.10 to 1.25 X/-	INR X/-
3.	Investment for production.	Comparatively high.	Comparatively low.
4.	Curing method.	Steam curing in autoclave.	Water curing or regular steam curing.
5.	Dry density (As per IS codes).	450kg/cum to 1000kg/cum.	800kg /cum to 1800  kg/cum.
6.	Cost.	Comparatively expensive.	Comparatively  cheaper.
7.	Compressive strength.	3 to 5 N/mm2	2 to 7 N/mm2
8.	Manufacturing scale.	Manufactured in large scale.	Manufactured in medium or small scale.
9.	Air voids percentage.	50 to 60% of total volume.	30 to 40% of total volume.
10.	Quality.	Consistent as production is mostly automated.	Inconsistent, as the production is labour oriented.
11.	Variation in dimension.	± 1.5mm.	± 4mm.
12.	Water absorption.	30%  for the block having density of 1000kg/cum.	12.5% for the blocks having density of 1000kg/cum.
13.	Production process.	The large size blocks are cut to the required sizes using machinery.	The individual blocks are made in separate moulds.
14.	Comparative strength for the blocks having same density.	1.10 X to 1.30 X	1 X
15.	Space for curing.	Needs less space.	Needs more space.
16.	CO2 emission.	Emits slightly more CO2 in comparison.	Emits slightly less CO2 in comparison.
17.	Availability.	Made in larger factories. So, they may not be available locally.	Made in smaller units. So, they may be available locally.
18.	Transport.	Adds more money to transport.	Adds less money to transport.

 

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