Partial Replacement of soil of Newai Reason as Sand in Construction Industry

Abstract

In our project we use saw dust as a waste material for partial replacement of sand in concrete for modifying its properties. In the concrete mixes sand was replaced at  0%, 10%, 20% 30%,40% & 50% by weight and effects of replacement on concrete is observed. Use of saw dust in concrete permits disposal of waste (saw dust) and make concrete light in weight. Concrete, cubes measuring 150 x 150 x 150 mm, beams of sizes 550 x 100 x 100 mm  were cast and their compressive, flexural strength and split tensile strength is evaluated respectively after 7, 14 and 28 days. Metakaolin is use as an admixture which possess cementious properties which provides good bonding between saw dust and ingredient of concrete

The importance of concrete as construction material is increasing every day. Sand as a primary fine aggregate possesses superior adhesion of components in concrete and provides strength. Since a large demand has been placed on building material industry especially in the last decade owing to the increasing population that causes a chronic shortage of building materials, the civil engineers have been challenged to convert the industrial wastes to useful building and construction materials. Our experimental research tries to implicate that sawdust-cement-gravel mix has an equal advantage like the standard mix of cement-sand-gravel. While casting the specimen for checking the compressive strength of concrete, it was observed that the concrete containing sawdust get compacted more efficiently than the normal concrete. Dry porous sawdust could absorb sufficient amount of water that could be an effective mean of internal curing and absorb the excess water in the mix and provide the water required for the hydration of the cement. Since sawdust is already waste , the construction cost will be reduced and also a solution to environmental pollution.