Light Weight Building Blocks using Industrial Waste

AAC was invented in mid-1923 in Sweden. It is also known as Autoclaved Cellular Concrete (ACC) or Autoclaved Lightweight Concrete (ALC). Production process of AAC is fairly simple. It is made with made with a mixture of fly ash, lime, cement, gypsum, an aeration agent and water. Aeration process, imparts it a cellular light-weight structure. AAC products are precast in various sizes and provide structure, insulation, and fire and mold resistance. Autoclaved Aerated Concrete (AAC) blocks in construction industry in India offers interesting proposition for various segments in the society. For a project developer it means faster and lower cost construction. For environmentally conscious it means eco-friendly products and for those who occupy buildings built with AAC blocks it means better safety and lower energy costs for cooling or heating. Primary raw material for AAC is fly ash. Thousands of tonnes of fly ash is generated by thermal power plants everyday and its disposal is a cause of concern. Moreover, using fly ash does not harm the environment at all. In fact using fly ash takes care of issues related to disposal of fly ash. Present study is based on utilization of industrial waste in preparation of building blocks. Therefore by using fly ash to produce AAC products provides a sustainable, economic and environment friendly option. At the end it all translates to a better world for future generations.