MHE International

Autoclaved Aerated Concrete - Production and Manufacturing Process

Autoclaved Aerated Concrete (AAC) is made from silica sand, lime, cement and water, to which an expanding agent is added. The AAC manufacturing process starts when the sand is ground to the required fineness in a ball mill. Raw materials are then automatically weighed and measured in the mixer along with water and an aluminum paste (the expanding agent). After mixing, the slurry is poured into metal molds in which the expanding agent reacts with the other elements. The mixing results in a chemical reaction that expands the mixture to form small, finely-dispersed air spaces. The molds are sent to a pre-curing room for several hours. Then the semi-solid material is transported to the cutting machine. The cutting machine cuts the molds, using steel wires, into the size required for the building elements. The products homogeneity combined with our high precision cutting technology, results in pieces with dimensional tolerances of 1/16”.The final phase in the production process is steam pressure curing in autoclaves for up to 12 hours. Block, panels and other AAC elements are removed from the autoclave, packaged and sent to the finished product storage. AAC reinforced elements, such as slab panels, wall panels, and lintels contain steel reinforcement mesh that is treated for corrosion with a water based acrylic, then placed in the mold before the slurry is added. The manufacturing process is then the same as described above for unreinforced elements.

Autoclaved Aerated Concrete - Production and Manufacturing Process

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