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Granite cutting waste is becoming a serious concern as the amount of waste produced is reaching monstrous proportions, thus making it virtually impossible to ensure proper disposal. The large volume of waste generated is dumped on to the dumping grounds nearby factory location. This unattended waste poses serious environmental and health threats and is an alarming call to seek out methods of production which may utilize this waste and thus lead to a cleaner environment. The research study aims at assessing the durability characteristics of the concrete incorporating this waste as a partial replacement for fine aggregate. The aim of the paper is to present a comprehensive, detailed and systematic picture of performance of the concrete thus obtained under adverse exposure conditions in terms of response to carbonation attack, sulphate attack, chloride ion penetration, acid attack and elevated temperature with variable w/c ratios. The test results clearly showed that modified granite cutting waste substituted concrete exhibits enhanced resistance to carbonation, chloride ion penetration, acid attack and exposure to elevated temperature at optimum granite cutting waste replacement of 25%. No loss in weight was observed at all durations of exposure to MgSO 4 solution. The specimen with 25% granite cutting waste replacement exhibited greater intensity and peak area for hydration products namely C–S–H and ettringite as compared to the control specimen. [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]