– The Use of Rice Husk Powder in Composites Cement System –
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High cost of cement has caused serious impact on housing delivery due to increase in energy costs and high demand which attracted many research interests in sourcing other alternatives cheaper materials. The use of rice husk powder in composites cement system was investigated.
Compressive strength of the various mix proportions at 28 days were determined using standard compressive strengths testing machine. The hydration products of the high percentage replacement composite cement pastes were identified by x-ray diffraction analysis and compared with those made from 100% ordinary Portland cement pastes.
Results indicate that only lower percentage replacement level such as 5% and10% rice husk powder contained the required amounts of silica which aided the hydration process producing samples with compressive strengths of 19.72N/mm2 and11.57N/mm2when compared with control sample with 33.33N/mm2.
However, result of the x-ray diffraction analysis showed that the observed hydration products were mostly as expected due to the high replacement levels but the degree to which crystal phases were identified in one of the samples was unusual.
Portland cement is the essential binding agent in cement composite systems, which in turn is the most commonly used construction material worldwide due to its many advantages including lower relative price, durability and other properties. (Escalante and Sharp,2004).
Its cost is increasing due to the increase in energy cost and high demand of the product.
However, to meet this demand other alternative cheaper materials are being sourced. (Escalante and Sharp,2004 ).
Materials of natural origin such as volcanic ash (VA) or industrial by product, like granulated blast furnace slag (GBFS) and pulverized fuel ash (PFA) have been widely used as partial replacement of Portland cement in concrete construction (Escalante and Sharp, 2004).
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