MAKING OF AERATED LIGHTWEIGHT CONCRETE USING ALUMINIUM POWDER

Abstract
The primary use of lightweight concrete is to reduce the dead load of a concrete structure which then allows the structural designer to reduce the size of columns, footing and other load bearing elements. So the marginally higher cost of the lightweight concrete is offset by the size reduction of structural elements, less reinforcing steel and reduced volume of concrete, thus resulting in lower overall cost.
Lightweight concrete can also be used for fire protection, where they can shield structural steel from fire. They are also used as an insulating block due to the cellular structure.
Lightweight concrete can be used to construct extremely large cantilevers, as the member can be narrower due to the decreased dead load. Using concrete of a lower density results in a lower dead load and can result in savings due to smaller member sizes. Occasionally this can allow construction on ground with a low load-bearing capacity.
The porosity of lightweight aggregate provides a source of water for internal curing of the concrete that provides continued enhancement of concrete strength and durability, but this does not prevent the need for external curing.
Structural light-weight concrete has been used for bridge decks, piers and beams, slabs and wall elements in concrete and steel buildings, parking structures, tilt-up walls, topping slabs and composite slabs on metal decking.
In this research aerated lightweight concrete was designed with the use of aluminium powder which is our foaming addative, reducing dead weight of structures and to obtain a more economical structure due to increase in volume of the concrete.

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