Using wood fiber waste, rice husk ash, and limestone powder waste as cement replacement materials for lightweight concrete blocks
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: Dumping or removing of industrial waste is a great concern for environment. So the usage of ash on replacement of cement increase the compressive strength. In these days the Rice Husk Ash, Fly Ash plays vital role in increasing the compressive strength of concrete. In this investigation , the cubes were made by approximate replacement of 15%,20%,25% by weight of cement. The workability and durability was increased as compared with ordinary Portland cement concrete. From our results as 15% of replacement of Rice Husk Ash by weight of cement yields higher compressive strength as compared to ordinary Portland cement. By 20% of replacement of Rice Husk Ash by weight of cement yields lower compressive strength as compared to ordinary Portland cement. By 25% replacement of Rice Husk by weight of cement yields higher compressive strength at 7 days & 14 days and decrease the compressive strength at 28 days.
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Abstract Cement is one of the important materials in concrete mixture and use for building construction. High demand for cement usage due to the rapid development of construction in the country needs to be addressed. The objective of this study is to identify the workability and compressive strength of concrete at different level of replacement of cement. Cement was replaced with durian pectin and RHA by weight at 10%, 15% and 20%. Compressive strength and water absorption test were carried out on hardened 150mm x 150mm x 150mm concrete cubes after 7, 14 and 28 days of curing. The results revealed that the compressive strengths reduced as the percentage durian pectin and RHA increased in same ratio 5:5, 7.5:7.5 and 10:10. The sample consist of 5% of durian pectin and 5% of RHA is the optimum ratio replacement of cement in concrete with highest compressive strength 27.5 N/mm 2 , medium workability and water absorption 6%.
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Abstract Raw rice husk is an abundantly available waste material in Indonesia as one of rice producing countries. Due to rice husk is light in weight and convex in shape, this paper presents a preliminary application of raw rice husk as natural aggregate in order to make lightweight concrete blocks. Concrete specimens contained Portland Cement, filler, and raw rice husk, in which the mix proportion was in volumetric ratio, i.e 1.25 cement and 2.75 filler constantly, whereas dosage of rice husk varied from 8.5 to 10. The production of the concrete block was by mixing the ingredients together and then the mixture was casted and compacted on moulds by hand manually. Series laboratory experiments were accomplished to analyse the compressive strength and density. For this, four groups of mixes were prepared. The results have shown that the higher proportion of rice husk is the lower its compressive strength and the lighter its density. At proportion of 1,25 cement: 2,75 fillers: 8,5 raw rice husks, the compressive strength is 26.64 kg/cm 2 and this satisfies the minimum standard (25 kg/cm 2 ). Unfortunately, the density is 1,536.73 kg/m 3 and it is higher than the maximum standard of 1,400 kg/m 3 . Thus, it is important to research further by making and testing some improved specimens with more cement, more rice husk, and less filler to fulfil strength and density.
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This study investigates the effectiveness of rice husk ash (RHA) as a partial or full replacement of cement in manufacturing of concrete. C20 grade concrete was chosen for this study and different mixes of concrete with replacement of ordinary portland cement with rice husk ash at different substitution levels (10%, 20%, 30% and 40%) were tried. The performance of the new composite was adjudged by carrying out fresh (workability), mechanical (compressive strength and split tensile strength) and durability (water absorption, water desorption and sorptivity) tests. The experimental results at fresh state of concrete revealed that, due to the higher surface area of RHA, workability of concrete slightly decreases compared to controlled concrete. At hardened state of concrete, the mechanical property test results revealed that the new composite with 10% of RHA as a partial replacement of cement has a better strength compared to the controlled concrete which is related to the pozzolanic nature of the rice husk ash. From durability perspective, the new composite showed a better resistance to water absorption, desorption and sorptivity with inclusion of rice husk ash upto 20% as partial replacement of cement. Hence, it can be concluded that rice husk ash can be used as a partial replacement of ordinary portland cement in manufacturing of concrete. The utilization of rice husk ash by the construction industry in Ethiopia will not only help in safe disposal of the waste but also will be a sustainable approach for construction in Ethiopia.
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The study investigated potentials of rice husk ash as a replacement for Ordinary Portland Cement in the production of Compressed Earth Block (CEB) with a view to reducing building construction cost and the embodied energy of the blocks in the context of Nigeria. Graded levels (i.e. 10, 20, 30 and 40%) of RHA replaced cement in the mix for CEB moulding. The results of X-ray diffraction showed that RHA contained 80% SiO2. Also, the results of the compressive strength, water absorption capacity, and bulk density testing indicated that low compressive strength, high water absorption capacity, and low bulk density exhibited by RHA-CEB make doubtful the suitability of RHA as a partial replacement for Ordinary Portland cement in the building construction in the wet regions. However, RHA could find useful application as a stabilizing agent in CEB rather than as a partial replacement of cement.
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The use of pozzolanic material from waste product as partial cement replacement in concrete contribute to reduce the environmental, economic problem through their waste and as well enhance the strength and properties of concrete. Rice husk ash (RHA) is one of the industrial waste that suitably used as a cement replacement due to its pozzolanic properties which can enhance the properties of concrete. In this study, the workability, compressive strength and water absorption of the concrete containg RHA is investigating. The chemical content of RHA also investigated by using X-ray Fluorescence Test (XRF). The different RHA percentage of 5%, 15% and 25% were used in this study with burning temperature 650°C. The concrete cube of size 100 mm x 100 mm x 100 mm were prepared and cured for 7, 14 and 28 days. Based on result, it was concluded that the optimum RHA replacement for cement in this report was 5 %, which provided the highest compressive strength at 28 days.
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The present study depicts on mechanical properties of concrete withSunflower Seed Husk Ash (SSHA) as partialreplacement of cement. Concrete made with Ordinary Portland Cement is the most widely used material in all thecountries. Hence the production of Ordinary Portland Cement is expensive and ecologically harmful. Cement industriesreleasing huge quantity of CO2which pollute the environment. Structural concrete can be produced using sunflower seedhusk ash to meet strength and other requirements. In this project work, various percentages of SSHA added with concreteandthe mechanical properties where studied. The effects of SSHA as partial replacement of cement on concrete propertieswas investigated. Concrete was produced by adding various amount of SSHA (2.5%, 5%, and 7.5%). From the literaturereview it has been noticed that the replacement of sunflower seed husk ash in concrete was very successful in reducing ofunit weight, compressive strength, splitting tensile strength and freezing-thawing resistance. But water absorption rate isincreased after 28 and 90 days. Based on experimental results its physical and mechanical properties show that concreteproduced with sunflower seed husk ash has great potential as a low cost lightweight building material.
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This paper emphasized the use of rice husk ash (RHA) and sugarcane bagasse ash (SBA) in improving concrete properties, and also their combined effects on workability, compressive strength, flexural strength, permeability and water absorption capacity. Thus, in this study, the water-to-cement ratio was kept constant (0.45), the binder materials content for conventional mix was kept constant at (350 kg/m3) and the partial replacement of cement with RHASBA used was 5%, 10%, 15%, 20%, 25%, and 30% by weight of cement. The maximum compressive strength was noted at a 5% replacement level of cement with RHASBA. The Results showed that the optimum replacement of cement with RHASBA in concrete was 5%, which was found to increase the compressive strength by 15%, flexural strength by 3.4%, lowered permeability by 50%, lowered sorptivity by 11.34% as compared with control concrete at 90 days of curing time. The micro-structural test results further established that RHA and SBA have a high content of SiO2 which enables them to be more reactive in concrete and also revealed that the presence of RHASBA depletes Ca(OH)2 crystals, converting it into CaH2O4Si (C-S-H gel) leading to the strengthening of bond within the concrete matrix.
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