AAC PRODUCT PROPERTIES AND SPECIFICATIONS

Chemistry of AAC Product

Autoclaved Aerated Concrete consists of the unique combination of Tobermorite 11A molecules and air pores. Tobermorite 11A is a molecule that, once created, cannot physically decompose through heat, rot, corrosion or other chemical process and thus is very durable.

AAC products are produced using a mix of generally abundant-available raw materials like sand, cement, lime and gypsum. The raw materials are mixed with water, a very small amount of aluminium powder is added, and poured in large moulds.

All in all, the combination of cement, lime, gypsum, sand and most importantly aluminium powder causes the mixer to expand considerably.

From beginning to the end, the simplified chemical reactions are as follows

Cao + H2O	=	Ca(OH)2 + 65.2 KJ/mol
3Ca(OH)2 + 2 Al + 6 H2O	=	Ca3(Al(OH)6)2 + 3H2
6SiO2 + 5Ca(OH)2	=	5CaO.6SiO2.5H2O

AAC block

Autoclaved Aerated Concrete or AAC blocks, is a steam-cured cementitious product manufactured from a mix of fly ash(Sand), cement, lime, gypsum and aluminium powder giving it its unique lightweight internal structure. Its attributes like its light weight nature, excellent thermal insulation, acoustic properties and energy efficiency make AAC an intelligent building solutions system.

As a revolutionary precast building material, AAC blocks offer a unique combination of high durability and strength, low weight, unprecedented build ability and superior ecological green features and is fast replacing ordinary red clay and fly ash bricks.AAC blocks is the preferred choice for all building applications and is used for all kinds of walls, be it external or internal, non-load bearing walls etc.

There are two types of AAC Block

Length x Height (mm)	Thickness (mm)	Quantity Per CM
600 x 200	50	156
	100	83
	150	56
	200	42
	225	37
	250	33
	300	28

Panel

Panels are a perfect solution to construct large scale commercial and industrial buildings. The AAC panel are With Increased load bearing capacity due to use of embedded steel reinforcement, the need of additional bond beams and staff columns can be eliminated. The AAC panels are large in size compared to traditional building materials and come customized according to building requirements which results in substantial reduction in construction time.

AAC panels of 3000mm are equivalent in area to approximately 93 standard bricks, making them faster to install than other masonry products.

Size specification

Width: 600mm

Length: 2400-6000mm

Thickness of 75-200mm per 25mm interval.

Propertiesn

Load bearing capacity: 5.0 – 6.5 kN/m^²

Dry density: 550 - 580 kg/m3

Working density: 780 – 820 kg/m3

Heat conductivity: 0.13 W/mK

Dry shrinkage < 0.09 %

Modulus of elasticity: 2190 KN/m2

Types of AAC Panel

AAC floor & roof slab

A floor area up to 40 ft2 can be easily installed with one crane lift utilizing. The panels have suitable reinforcement, AAC ROOF PANELS are intended for using in ceilings and roofs in dwellings as a load bearing and heat-proof element. By using AAC FLOOR PANELS which provides the load bearing capacity of the panels.

Wall panel

Reinforced AAC wall panels are internal non-load bearing partition panels. The steel reinforcement wires allow excellent dimensional accuracy. They are cured in a high pressure and temperature autoclave which renders high compressive strength to them. It is ideal for wall systems and sound barrier systems.

Different type of reinforcement in panels

Lintel

AAC Lintels are reinforced elements similar to panels. They are used as support over windows, doorways and other openings.

Lintels are available in standard block thickness of 100mm, 125mm, 150mm and 200m and lengths up to 2,700mm.

Refer to lintel table for standard sizes.

Lintels are also used as spreaders under the end supports of reinforced concrete beams to distribute high bearing stresses into the supporting AAC wall.

Window Opening Width (mm)	Lintel Length (mm)	Lintel Height (mm)	Lintel Thickness (mm)
900	1200	200	100,125,150,200
1200	>1600	200	100,125,150,200
1600	1900	200	100,125,150,200
1800	2100	300	100,125,150,200
2100	2700	300	100,125,150,200