Bond strength of autoclaved aerated concrete manufactured using partial replacement of flyash with fibers – A review

Autoclaved aerated concrete is widely attracted because of its excellent environmentally friendly characteristics and thermal insulation property. Autoclaved lightweight concrete (ALC), autoclaved cellular concrete (ACC), cellular concrete, autoclaved concrete, porous concrete, Ytong, hebel block, aircrete, and thermalite are some of the other names for AAC. AAC is a cent percent green construction material that has been used to construct the highest rated green structure. It consumes the least amount of energy and material per cubic meter of product, making it the most energy and resource efficient. Unlike brick manufacturing, which wastes valuable agricultural soil, AAC uses fly ash as the most beneficial answer to the country's fly-ash use problem. AAC's unrivalled strength-to-weight ratio, which is even higher than M150 concrete and greatly exceeds Indian building code standards, is achieved by a high-pressure steam-curing autoclaving process. In this article physical, mechanical and microstructural properties of AAC on replacing fly ash with various additives are studied. Comparison of properties for AAC manufactured using different additives were made and explained. AAC is a versatile building material. Fiber reinforced aerated concrete (FRAC) is a form of light weight aerated concrete which consist of internal reinforcement with small polymer fibers. Numerous materials such as basalt, rice husk, granite, graphite, zeolite, municipal solid waste, iron ore tailings, silica fume were used as fibers and incorporated (especially organic and industrial wastes) in manufacturing process of AAC. The mechanical (drying shrinkage), physical (compressive strength, flexural strength, thermal insulation, modulus of elasticity) and microstructural analysis (XRD, SEM) were done for different fiber incorporated AAC and results were studied an d compared. Above study indicates that all the properties depend on main factors such as condition during autoclaving process. Thus by the use of autoclaving, various industrial wastes, industrial byproducts and organic wastes are used in manufacturing AAC leads to reduction in wastes and widening the application of AAC.