Influence of cement paste containing municipal solid waste bottom ash on the strength behavior of concrete
Effects of metakoalin on municipal solid waste incineration (Mswi) bottom ash-cement composite
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Publication
Cement in construction has become a vital requirement to build up the buildings, which may increase the expenses in construction. Materials that have the potential to replace cement would be proposing. This study used municipal solid waste incineration bottom ash (MSWIBA) as a partial replacement for cement. MSWIBA used in this study was a by-product from the incineration process and had compound content that was almost the same as cement. The treated bottom ash in the range of 0 to 30% and 10% of untreated bottom ash mixture use in this study. Mechanical and physical properties of concrete analysed with a few tests such as slump test, water absorption test, compressive strength test, heat exposure test and residual strength test after heating has proceeded. The workability of fresh concrete was measured by performing a slump test. Based on the compressive strength result, the 10% substitution of treated bottom ash was achieved the highest strength in testing in 7 and 28 days. Meantime, the control concrete obtained the best thermal insulator because of a smaller number of cracks on the surface of the concrete than that bottom ash concrete surface. After heated, the concrete was tested on compressive strength again to investigate the residual compressive strength. The highest residual surpasses gained by 10% bottom ash (treated) as a partial substitution in cement. Based on the overall test carried out, 10% of bottom ash replacement as cement is the optimum amount of bottom ash required to surpass the strength of the control sample.
Publication
Municipal solid waste incinerators (MSWI) produce by products which can be classified as bottom and fly ashes. The bottom ash (BA) accounts for 85-90% of solid product resulting from municipal solid waste combustion. The objective of this study was to assess the feasibility of municipal solid waste incineration bottom ash as a supplementary cementations material for the preparation of blended cement. The used of bottom ash as a research material is because of substances contained in bottom ash which is almost same with cement. X-Ray Fluorescence (XRF) spectroscopy analysis was used to determine chemical compositions of the BA and metakoalin (MK) used in this study. Five series of concrete mix design had been examined which contained different percentage of bottom ash and metakaolin as partial replacement for cement in concrete mixes by volume. A few test such as workability, water absorption, and compression test were carried out to investigate properties of grade 20 concrete incorporating bottom ash and metakaolin. The concrete cubes were tested at age of 7 and 28 days to study the development its compressive strength. Concrete mix design with 10% BA and 10% MK shows the highest strength of 32.9 MPa and surpassed strength 20 MPa. Bottom ash was found to have some reactivity, but without greatly affecting the hydration process of Ordinary Portland cement (OPC) at 10% replacement with 10% metakaolin is required to be used in the production of concrete in order to improve strength.