aac block

Key Features

⦁ Lightweight autoclaved concrete block.
⦁ Reduces structural cost.
⦁ Quicken construction upto 30%.
⦁ Reduces foundation load of the building upto 30 %.
⦁ Steel and Cement saving by 18% & 12% respectively.
⦁ Exceptional thermal and acoustic insulation.
⦁ Green building product.

What are AAC blocks?

Blocks made of autoclaved aerated concrete (AAC) are strong and lightweight construction materials. Johan Axel Eriksson, a Swedish architect and inventor first conceived of and developed AAC blocks in 1924. AAC blocks are renowned for its ability to withstand fire, heat, and sound. These building materials are often lightweight, weighing just about 30% as much as the more popular red clay bricks, with air making up around 80–85% of their capacity.

How are they made?

AAC blocks are often made with materials including lime, cement, sand, water, gypsum, fly ash, and calcium oxide (commonly known as quicklime). Towards the end of the process, aluminum powder chemically combines with them, causing hydrogen gas to release into the atmosphere. AAC blocks have a distinctive honeycomb structure, are lightweight, and have additional insulating qualities as a result of this chemical reaction.
These are then cured in an autoclave (exposed to high heat and pressure) after undergoing the appropriate moulding and mixing, which gives them the desired strength and durability.

What are the advantages of using AAC Blocks?

AAC blocks are typically nine times larger than standard clay bricks. This leads to better construction efficiency and quality, as well as a significant decrease in expenses at the site for things like plaster and mortar. Best-in-class thermal insulation is significant because it lowers the cost of heating, ventilation, and air conditioning (HVAC).

AAC material is frequently utilized in the construction of residential buildings, healthcare facilities, schools, hotels, and other industrial and commercial structures due to its high standards for workability and flexibility.

Physical Properties

DENSITY IN OVENDRY CONDITION	COMPRESSIVE STRENGTH, Min	COMPRESSIVE STRENGTH, Min	THERMALCONDUCTIVITY IN AIR DRY CONDITION
kg/m3	N/mm2 (grade-1)	N/mm3 (grade-2)	W/m.k
451 to 550	2.0	1.5	0.21
551 to 656*	4.0	3.0	0.24
651 to 750	5.0	4.0	0.30
751 to 850	6.0	5.0	0.37
851 to 1000	7.0	6.0	0.42

For ready reference refer to the link below.

Technical Specifications

Property	Unit	Value
Face Size##	mm	600×200/ 600×240/ 625×240/ 650×250
Thickness*	mm	75 \| 100 \| 125 \| 150 \| 200 \| 230
Dry Weight	Kg	5.25 \| 7 \| 8.75 \| 10.5 \| 14 \| 16.10
Compressive Strength** (min)	N/mm2	3
Normal Dry Density	Kg/m3	551-600
Thermal Conductivity	W/m-k	0.15
Sound Reduction***	db	37-42
Fire Resistance-load Bearing (200mm Thickness)	Hrs	4
Non Load Bearing (100mm thickness)	Hrs	4#