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Title: Effect of Sandstone Quarry Dust on Properties of Concrete as Partial Replacement of Natural Sand
Authors: Singh, Jashanpreet
Siddique, Rafat (Guide)
Singh, Malkit (Guide)
Keywords: Quary Dust;Sandstone;Filling Effect;XRD;SEM
Issue Date: 24-Oct-2017
Abstract: Sources of good quality river sand are depleting very fast all around the world and excessive sand mining is giving rise to many environmental issues. The demand of sustainable growth of infrastructure in modern times is to find an alternative material for river sand that should not only satisfy the technical specification of fine aggregate, but it should also be abundantly available. Quarry dust is a by-product of stone crushing industry, which has a great potential to be used as a partial substitute for natural sand in concrete. The objective of the present study was to explore the possibility of utilization of sandstone quarry dust as a partial replacement of natural sand in concrete. Experimental tests were performed to evaluate workability, hardened properties, durability properties and characteristics of concrete with partial replacement of natural sand with sandstone quarry dust at replacement levels of 10%, 20%, 30%, 40% and 50%, and all properties were compared with conventional concrete containing 100% natural sand. The properties of concrete studied were workability, density, compressive strength, splitting tensile strength, water absorption, sorptivity, chloride-ion penetration and XRD & SEM analysis. Test results indicate that at constant w/c ratio, workability of concrete decreased with inclusion of sandstone quarry dust as partial replacement of natural sand in concrete. There was an significant improvement in compressive strength and splitting tensile strength of concrete containing sandstone quarry dust as compared to control concrete, with concrete containing 40% quarry dust showing maximum compressive and splitting tensile strength at 7, 28 and 90 days. A decrease in water absorption, sorptivity and chloride-ion permeability was observed in all concrete mixes containing sandstone quarry dust as partial replacement of natural sand in concrete as compared to control mix. XRD analysis at 28 and 90 days shows that sandstone quarry dust is mainly an inert material, which does not affect hydration process of cement. SEM analysis shows the progressive decrease in voids in quarry dust concrete mixes as the replacement of natural sand with sandstone quarry dust was increased, proving that the filling effect of sandstone quarry dust micro-fines was leading to dense microstructure of concrete, which can be regarded as the main reason behind the improvement in concrete properties.
Description: Master of Engineering -Structural Engineering
Appears in Collections:Masters Theses@CED

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