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One of the most challenging problems of 21 st century is solid waste management and stone slurry is a prime shareholder in this waste. The paper aims at assessing the feasibility of utilizing the two different types of stone waste generated globally in huge quantities i.e., Granite cutting waste and marble slurry as a replacement for fine aggregate in concrete manufacturing. The paper reports the similarities and highlights the contrasting behaviour of GCW and MS concrete in terms of durability, compressive and flexure strength, abrasion, permeability and ultra-pulse velocity. The strength and durability of concrete is determined by a number of factors including the physical and chemical composition of constituent ingredients as well as the microstructure of ingredient particles. Explanations for the trends observed have been derived from microstructural studies using SEM and EDS test and also the inter-particle behaviour of the ingredients within concrete matrix . It was found that neglecting minor variations the optimum replacement percentage for GCW and MS concrete were 25% and 15% respectively. Abbreviation: GCW- Granite cutting waste; MS – Marble Slurry; w/c – water-cement ratio. [ABSTRACT FROM AUTHOR]

The excessive consumption of river sand as a construction material has led to its acute scarcity. Researchers across the globe have attempted to utilize waste of copper slag, rubber tyre, recycled glass, pond ash, foundry sand, plastic, stone etc. as a partial or complete substitute of river sand in concrete. The present study investigates the feasibility of using granite cutting waste (GCW) as a partial substitute of river sand in high strength concrete based on strength, durability & microstructural attributes. Eighteen concrete mixes were cast at 0.30, 0.35 and 0.40 water cement ratios (w/c) by substituting 0%, 10%, 25%, 40%, 55% and 70% river sand by GCW. The concrete mixes were tested for compressive, flexural strength, abrasive resistance, permeability, water absorption, carbonation, corrosion and microstructure; changes in morphology and hydration were also studied. Test results suggested that 25–40% river sand can be substituted by the GCW with a favourable influence on the investigated parameters. The optimum amount of GCW to be used in concrete depends significantly upon water-cement ratio of concrete. [ABSTRACT FROM AUTHOR]

Industrial by products such as granite cutting waste (GCW) are suspected to have a detrimental effect on environment. This paper emphasizes on a sustainable way of getting rid of GCW by using it as a partial replacement of natural fine aggregate (river sand) in conventional concrete. In this paper, strength and durability behaviour of concrete containing GCW is examined so as to determine its viability in concrete production. Concrete was prepared with GCW in 4 different proportions i.e. 10%, 20%, 30%, and 50% and various tests such as compressive strength, flexural strength, abrasion resistance and permeability test were performed and the experimental values were compared with the control mix. Microstructural studies of control mix (CM) and mixes with different percentages of GCW were also performed using SEM and XRD techniques to identify effect of incorporating GCW on performance of concrete with respect to C–S–H gel, silica and other hydration products, which has not been investigated in the past. Microstructural investigation helps in understanding the variation in strength of concrete with different percentages of GCW. Test results, SEM and XRD analysis of concrete mixes indicates that optimum replacement percentage of fine aggregate with GCW is about 30% as the performance of concrete is significantly improved at this replacement level. Hence, GCW can be used as a partial substitute of river sand and thereby reducing cost of concrete production. Optimal replacement of sand by GCW can open up new avenues in sustainable construction techniques and reduce the detrimental effect on environment due to waste disposal. [ABSTRACT FROM AUTHOR]