Conventionally concrete is a mix of cement, sand and aggregate. There is a large variation in the strength of concrete due to variation in the strength of aggregates used. There is scarcity of natural sand due to heavy demand in growing construction activities which forces to find the suitable substitute. The cheapest and the easiest way of getting substitute for natural sand is by crushing natural stone to get artificial sand of desired size and grade which would be free from all impurities. This paper presents the feasibility of the usage of artificial sand obtained by crushing basalt over natural sand considering technical, environmental and commercial factors. For the purpose of experimentation concrete mixes are designed for M20, M30 and M40 grades by 100% replacement of natural sand to artificial sand. Compressive and flexural tests are conducted to study the strength of concrete using artificial sand and the results are compared with that of natural sand concrete.
<p>In India, conventional concrete is produced by using natural sand from river bed as fine aggregate. Dwindling sand resources poses the environmental problem and hence government restrictions on sand quarrying resulted in scarcity and significant increase in ist cost. This paper presents the performance study of artificial sand as fine aggregate for concrete by comparing ist basic mechanical properties with that of conventional concrete. Three matrices with compressive strength 20, 30 and 40 Mpa were designed and reinforced with crimpled steel fibers at dosage rate of volume fraction 0, 0.5, 1.0 and 1.5 percent. Sufficient numbers of specimens were prepared, cured and tested for compressive strength, flexural strength and split tensile strength at 7 and 28 days curing. The experimental results encourage the full replacement of natural sand by artificial sand. The promotional use of artificial sand will conserve the natural resources for the sustainable development of the concrete in construction industry.</p>
<p>In India, fly ash generation reached to 130 million tonne per year (mtpy) during 2006-07, leaving about 70 mtpy unutilised posing serious disposal problem. A substantial part of fly ash is disposed off in the form of slurry, called as pond ash occupying hundreds of hectors of land. Environmentally compatible disposal through utilisation of waste materials by appropriate technologies is of increasing importance and imposes interesting technical challenges. There is an extreme scarcity of natural sand to be used as fine aggregate in concrete. Hence it indicates urgent need of effective utilisation of pond ash and crusher stone waste and conserves the natural resources. This paper addresses the use of pond ash and crusher stone waste as fine aggregate by replacing natural sand with pond ash in 25%, 50% and 75% of the total fine aggregate with crusher stone waste. The feasibility of pond ash with crusher stone waste is studied by performing compressive strength, and also correlating it by performing NDT tests.</p>
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