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To Study Strength Characteristics of Concrete with Rice Husk Ash
Background/Objective: The research was carried out to study the mechanical properties of concrete by partial replacement of cement with rice husk ash. The M40 grade of concrete was used to examine compressive strength, split tensile strength and flexure strength after 7 days and 28 days of curing. The cement is to be replaced (by weight) with rice husk ash by 5%, 10%, 15% and 20% to get optimized results. Methods/Statistical Analysis: In this research work, emphasis was made on examining the optimized quantity of RHA used as replacement with cement (by weight) by the medium of experimental investigation. Findings: As per results, Compressive strength for 5% replacement i.e. M-RHA5 increased by 2.1% as compared with control mix and for 10% replacement i.e. M-RHA10 decreased by 1.4 % as compared with control mix and it decreases for M-RHA15 and M-RHA20 mixes by 14.6% and 28.8% respectively i.e. compressive strength increases up to 10% for rice husk ash replacement with cement for M40 grade of concrete. Similarly split tensile strength also increases after 5% replacement for M-RHA5 i.e. increased by 3.9 % and after 10% replacement it decrease by 17.5 % and further decreasing for 15% and 20 % replacement by 19.3% and 31.7 % respectively as compared with RHA. There is no significant effect on split tensile strength as only 5% replacement is coming optimum. Flexural strength is optimized for different percentage of RHA and compared with control mix, i.e. it is increased by 10.9% for M-RHA5 mix and then start decreasing for M-RHA10 by 3% as compared with control mix. So for compressive strength M-RHA10 is optimum and split tensile strength and for flexural strength optimum content for RHA in cement 5% i.e. M-RHA5. Application/ Improvement: As RHA has significant role in increase of compressive strength as compared with split tensile strength and flexure strength. Cement replacement with RHA will help to reduce cost of construction.
Cement replacement, Mechanical Properties, Rice Husk Ash (RHA).
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