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AAC Introduction


Autoclaved Aerated Concrete (AAC) is a precast structural product made with cement, lime, water and sand that expands by adding aluminum powder.
 
It is an economical, sustainable, solid block that provides thermal and acoustic insulation as well as fire and termite resistance. AAC is available in a variety of forms, ranging from wall and roof panels to blocks and lintels.
 
To manufacture AAC, Portland cement is mixed with lime, silica sand, or recycled fly ash (a byproduct from coal-burning power plants), water, and aluminum powder or paste and poured into a mold. The reaction between aluminum and concrete causes microscopic hydrogen bubbles to form, expanding the concrete to about five times its original volume. After evaporation of the hydrogen, the now highly closed-cell, aerated concrete is cut to size and formed by steam-curing in a pressurized chamber (an autoclave). The result is a non-organic, non-toxic, airtight material that can be used for wall, floor, and roof panels, blocks, and lintels which according to the manufacturers, generate no pollutants or hazardous waste during the manufacturing process
 
AAC features include structural capacity, thermal, fire, and acoustical resistance properties. Because of the thermal mass of AAC and its ability to store and release energy over time, AAC may be beneficial in climates where outdoor temperature fluctuates over a 24-hour period from above to below the indoor temperature conditioned air set point.
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Main Parameters of Novotek AAC Plant

Description Item
Capacity (103M3/a) 10-45
Cake Size (m) 4-6 x 1.2/1.5 x 0.6
Cutting grade (mm) Horizontal: 10; Vertical: 5
Cutting accuracy (mm) ±2; ±1; ±1
Production cycle (min/mould) 4-6
Pre-curing time (hrs) 2.5-3
Autoclave time (hrs) 8-12
´╗┐Density (Kg/M3) 400-700´╗┐´╗┐


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