| Aerated Autoclaved Concrete |
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Aerated autoclaved concrete (AAC) also known as '''porous concrete''', was first developed by a Swedish engineer between the years 1920 and 1932 . It has since been modified and refined to a highly Thermally Insulating material used for construction both internally and externally. One of the material's advantages is its practicable way of use on site, it can be Routed , sanded and cut to size by both Band Saw s and Hand Saw s. Even though regular Cement Mortar can be used, 98% of the buildings erected with AAC materials uses thin bed motar, which comes to deployment in a thickness of 1/8 inch. This varies on national Building Code s. It creates solid and compact building members. RAW MATERIALS and water to evolve Hydrogen , this creates gas bubbles up to 1/8 inch in diameter and this stimulates the raw product to foam up and double its volume. At the end of the foaming process, the hydrogen escapes to the atmosphere where it reacts with air to form water. The hydrogen which was contained in the bubbles is replaced by air. After the forms are opened, the material carries a certain structural stability. It is cut into blocks and panels by wire. However, to reach full structural integrity and strength, now the material needs to be Autoclave d. Only under the specific conditions of autoclaving can further chemical reactions for hardening the material take place. During the steam pressure hardening process, when the temperature reaches 374 ° Fahrenheit and the pressure reaches 12 Bars , quartz sand reacts with Calcium Hydroxide and evolves to Calcium Silica Hydrate which account for the material's physical strength properties. After the production process of autoclaving has ended the material is ready for use. Depending on its Density , up to 80% of the volume of the concrete is air. Density also accounts for the variable structural compression strength of AAC material, which can carry loads up to 1,200 PSI. Since 1980, there has been a worldwide increase in the use of AAC materials and new production plants are being built in the United States , Eastern Europe , China , Bahrain , India and Australia . AAC is increasingly used by developers, Architect s and home builders. EXTERNAL LINKS |
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