Extensive growth in the developing countries due to infrastructure development\nis resulting into massive consumption of concrete thereby increasing the\ndemand on concrete materials. Quite large amounts of fine aggregates are required\nfor concrete in developing countries thus shortages of quality river\nsand is putting pressure on availability of fine aggregates. To fulfill the high\ndemand of fine aggregates, a search for alternative materials is in process.\nStone crushing and processing industry is a large industry which generates\nlarge amounts of stone dust and slurry which is a waste produced from this\nprocess. Tons of such waste generated has no useful purpose except as landfill\nmaterial. Some preliminary studies have been conducted into use of marble/\nlimestone waste for use in concrete [1] [2]. This study aims at using stone dust\nas partial replacement of sand in concrete to observe its effects on workability\nand other mechanical properties. This would result in useful consumption of\nthis waste product thereby eliminating environmental issues related to its\ndisposal. Partial replacement of 10% and 20% sand replacement with stone\ndust is carried out with the use of self-compacting concrete with blended cement.\nBlended cement used contains 50% rice husk ash and 50% Portland\ncement. Such high strength SCC with blended cement containing 50% rice\nhusk ash and 50% Portland cement has already been tested to provide better\nquality concrete [3]. Wide ranging investigations covering most aspects of\nmechanical behavior and permeability were carried out for various mixes for\ncompressive strengths of 60 MPa & 80 MPa. Compressive strengths of high\nstrength SCC with blended cements and 10% and 20% replacement of sand\nwith stone dust for 60 MPa and 80 MPa were observed to be higher by about\n10% to 13% than the control specimen. Higher elastic moduli and reduced\npermeability were observed along with better sulphate and acid resistance.Better strengths and improved durability of such high strength SCC make it a\nmore acceptable material for major construction projects thereby reducing the\nburden on environment and use of such waste product for a useful purpose\npromoting sustainable construction.
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