The increase in rate of construction increases the rate demand of Portland cement now a days. Due to urbanization it is estimated that the production of cement increase up to 200 million ton in 2015. Being development of nation on one side, the side effect grows in form of global warming. Increased rate of industrialization leads to Production of toxic gases like CO, CO2, and other hazardous gases leads to ozone depletion which is main cause of global warming & a threat to environment. CO2 gas contributes in relation to 63.33% of global warming. The factories which manufacture cement are responsible for a quantity of the CO2 gas production because the production of one ton of Portland cement emits around one ton of CO2 into the ambiance. To eliminate the main cause of global threat (CO2), the new idea came in to existence i.e. use of substitute materials in construction industry. For this purpose, the uses of industrial dissipate products and agricultural by products are very beneficial. These industrial dissipate and agricultural by products such as Silica Fume, Rice Husk Ash, Slag, and Fly Ash etc, are capable of used as cementing materials due to their pozzolanic behavior, these products require large tract of lands for dumping. Great amount of dissipate achieve as by products from several of the industries can be the main sources of such alternate materials. The world rice crop is estimated at 596 million tons per year and India is second major producer of rice in the world with yearly production of 146 million tons per year.The RICE HUSK ASH (RHA) can be utilize as a substitute material as replacement for ordinary Portland cement. This technology may possibly decrease the CO2 discharge to the environment caused by the cement industries.In the present study, a possibility has completed to use of Rice Husk Ash as an admixture to substitute of Portland cement in concrete, and an effort has been made to explore the strength parameter of concrete. For control concrete, IS method of mix design has taken on and considering this a basis, mix design for replacement technique has been finished. Five dissimilar replacement levels 5%, 7.5%, 10%, 12.5% and 15% are selected for the study concern to replacement method with range of curing stage starting from 7 days and 28 days are considered in the present study. The water/cement ratio used in this study is 0.40.The all results were compared to concrete without RHA. The compressive, split tensile and flexural strength were compared with those concrete without RHA. The results show that the rice husk ash gives the good performance on compressive, split tensile and flexural strength at the age of 28 days of curing. The results were evaluated with the concrete without RHA. The saturated water absorption results shows that the percentage of water absorption of concrete with containing 7.5- 12.5% replacement of cement by RHA is decrease as compare to concrete without containing RHA.
rice husk, compressive strength, flexural strength, workability
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