What IS AAC blocks & Comparison with Red Brick & CLC Bricks .

In India production of AAC block started in 1972. AAC Blocks is a unique and excellent type of building materials due to its superb heat, fire and sound resistance General People Understand about AAC From 2013 before that AAC was invented in the mid-1920’s by the Swedish architect and inventor Johan Axel Eriksson. After Long Period AAC Takes Pickup, Now AAC is Very Popular Construction Product in India. Also AAC is one of the major achievements of the 20th century in the field of construction. It is a lightweight, precast building material that simultaneously provides structure, insulation, and fire and mold resistance. AAC block is lightweight and offers ultimate workability, flexibility and durability.

Main Raw Materials include Fly ash, water, quicklime Powder, OPC cement, aluminum powder or Aluminum Past and gypsum also Many types of Aggregate and Bounding Additive we can use in AAC. The block hardness is being achieved by cement strength as well as Curing Systems and instant curing mechanism by autoclaving. Gypsum acts as a long term strength gainer. The chemical reaction due to the aluminum paste provides AAC its distinct porous structure, lightness, and insulation properties, completely different compared to other lightweight concrete materials. The finished product is a 4 times lighter Block compared to Other Concrete Bricks, while providing the similar strengths.

The Density stays around 600 kg/m3 to 700 kg/m3, because using these blocks in structural buildings, the builder saves around 30 to 35 % of structural steel, and concrete, as these blocks reduce the dead load on the building significantly.

AAC is a long proven material. AAC block is used in a wide range of commercial, industrial and residential application and has been in use in EUROPE over 90 years, playing significant role in UK, Middle East, America and Australia construction industry now a days in Maharashtra, Telangana, Andra Pradesh, Gujarat, and MP Is Using Large Amount Of AAC Blocks in There Construction. This unit is proposed to manufacture AAC Blocks by consuming the Fly-Ash or Any Silica Present Aggregate as one of the prime raw material. Fly-Ash, a major raw material with 70% proportion in AAC Blocks, an indispensable by-product of Thermal Power Plants, is an environmental threat across the globe. Power plants are facing an ever increasing challenge of disposal of this polluting agent.

Advantages AAC BLOCK

Fire Resistant

Depending upon the thickness of the Autoclaved Aerated Concrete (AAC) Blocks, they offer fire resistance from 2 hours up to 6 hours. These blocks are highly suitable for the areas where fire safety is of great priority.

Pest Resistant

Autoclaved Aerated Concrete (AAC) Block consist of the inorganic material in its constitution that helps preventing/avoiding termites, damages or losses.

Sound Proof

The porous structure of the AAC blocks results into enhanced sound absorption. The Sound Transmission Class (STC) rating of the AAC blocks up to 45 db. Thus, AAC blocks have been the most ideal material for the construction of walls in auditorium, hotels, hospitals, studios, etc.

Earthquake Resistant

The light weight property of the AAC blocks results into higher steadiness of the AAC blocks in the structure of the buildings. As the impact of the earthquake is directly proportional to the weight of the building, the building constructed using AAC blocks are more reliable and safer.

Faster Construction

As the AAC block is very easy to handle, manipulate and use ordinary tools for cutting the wood such as the drill, band saws, etc. could be easily used to cut and align the AAC. Moreover, the AAC blocks come with larger sizes and fewer joints. This ultimately results in faster construction work as the installation time is significantly reduced due to fewer amounts of blocks and the masonry amount involved is also lowered resulting into reduced time-to-finish.

Long Lasting

AAC blocks are highly superior in terms of the strength. Higher level of strength of these blocks gives higher stability to the structure of the building. AAC is manufactured from non-biodegradable materials, which neither rot nor attract mould, keeping interiors clean and durable.

Comparison of AAC Block, Clay Brick, CLC Brick

S.No	Parameter	AAC Blocks	Red Clay Bricks	CLC Blocks
1	Raw Materials	Cement, fly ash, water and Air entraining agents	Locally avaiable clay	Cement, lime, specially grinded sand, foam
2	Size	400-600mm X 200mm X 150mm – 300mm	225mm X 75mm X 100/150mm	400-600 x 200 x 100/150/200 mm
3	Variation Size	1.5 mm (+/-)	5 mm (+/-)	5 mm (+/-)
4	Compressive Strength (As per IS codes)	3-4 N/mm2	3.5 N/mm2	2 -2.5 kg/cm2
5	Dry Density (As per IS codes)	550-650 kg/m3 Its one-third of the weight of clay brick which makes it easy to lift and transport	1800 kg/m3	800 kg/m3
6	Cost Benefit	For high rise buildings there will be reduction of Dead weight which leads to saving in Concrete and steel quantities.	As easily available in local market hence it is beneficiary for low rise structure.	For high rise buildings there will be reduction of Dead weight which leads to saving in Concrete and steel quantities.
7	Fire Resistance (8″ Wall)	Upto 4 Hours	Around 2 Hours	Upto 4 Hours
8	Quality of End Product	Factory made product. So the quality of end product is consistent and good	Locally made product. Quality depends on various parameters like quality of raw materials used, process of manufacture etc.,	The quality of the end product depends on the foam used and degree of quality control
9	Sound Insulation	Better Sound absoprtion/insulation as compared to bricks	Normal	Better Sound absoprtion/insulation as compared to bricks
10	Energy Saving	Low thermal conductivity (0.24 Kw-M/C) helps in saving electricity costs 30% for heating and cooling of house	High thermal Conductivity (0.81 Kw-M/C). So no significant cost savings	Low thermal conductivity (0.32 Kw-M/C) helps in saving electricity costs 30% for heating and cooling of house
11	Environmental Friendliness	In AAC Block there is no top soil consumption and it emits very low Carbon dioxide as compare to Red clay bricks while manufacturing	One sq ft of carpet area with clay brick walling will consume 25.5 kg of top soil (approx). It actually damages environment	In CLC Block there is no top soil consumption and it emits very low Carbon dioxide as compare to Red clay bricks while manufacturing.
12	Internal and External Plaster	As these bricks have dimensional accuracy, the internal and extenal plaster thickness can be reduced	Requires thick plaster surface as there are variations in the dimensions	As these bricks have dimensional accuracy, the internal and external plaster thickness can be reduced
13	Finishing	excellent	Very bad	Not linear
14	Joining Process	Chemical mortars can be used for joining the brick. This reduces the material consumption of cement and also avoids curing process	Traditional mortar needs to be used and the brick work should be cured atleast for 7 days before plastering	Chemical mortars can be used for joining the brick. This reduces the material consumption of cement and also avoids curing process.
15	Availability	Factory setup cost is high.Not many factories, so availability is a concern.	Available locally in all cities and villages.	Factory setup cost is low as compared to AAC. Also takes long time to produce if steam curing is not used.Timely availability is a concern.
16	Thermal Insulator	AAC Blocks are very good thermal insulator if cooling is an major component of any building monthly expenses it will save cost for entire lifetime	It have low thermal insulation as compare to AAC and CLC Block	CLC Blocks are very good thermal insulator if cooling is an major component of any building monthly expenses it will save cost for entire lifetime
17	Tax Contribution	GST REFUNDABLE	No Tax Contribution	GST REFUNDABLE
18	Cylindrical Structures	For Cylindrical structure these blocks are not much useful	Cylindrical manholes or sewage chambers need small size of bricks so that the curvature can be formed hence Red clay bricks are useful	For Cylindrical structure these blocks are not much useful
19	Water Absorption	Absorb 12- 15% by total volume of AAC blocks	Absorb 17 -20% by total volume of red clay brick	Absorb 12-15% of water by total volume of Block
20	Range of Application	They are suitable for Non load bearing or RCC structure in partition wall	They are useful in both load bearing and non load bearing structure	They are suitable for Non load bearing or RCC structure in partition wall

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