AAC is made purely from natural raw materials, practically inexhaustible in nature – sand, lime, gypsum, cement and water- using an aerating agent and is hardened with vapor. This makes the product ecologically friendly, high strength, lightweight and with thermal properties.
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).
The mixing results in a chemical reaction 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 by steel wires.
The final phase in the production process is steam pressure curing in autoclaves for up to 12 hours. AAC blocks & panels are removed from the autoclave, packaged and sent to the finished product storage. AAC reinforced elements, such as slab panels and wall panels contain steel reinforcement mesh that is treated for corrosion with a water based acrylic, and then placed in the mold before the slurry is added. The manufacturing process is then the same as described above for unreinforced elements.
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The European Autoclaved Aerated Concrete Association (EAACA) elected a new president as its 57th general meeting. Outgoing president Jos Cox has long been the face