Abstract
Municipal Solid waste incineration bottom ash(MSWI BA) is a silicon-calcium-aluminum oxide obtained by high-temperature calcining of municipal waste. Its appearance is similar to natural sand, and its chemical composition is similar to cement clinker. It can be used as concrete fine aggregate replace natural sand in a small amount. This paper tested the physical and chemical properties of MSWI BA, and obtained the compressive strength and microscopic pore structure parameters through experiments of 5 water-binder ratios, 3 sand replacement ratios, and 2 curing ages of municipal solid waste incineration MSWI BA concrete, and analyzed the relationship between pore structure and mechanical properties. The results show that the compressive strength of MSWI BA replacement sand concrete decreases with the increase of air content, bubble chord length and bubble spacing coefficient, and increases with the increase of bubble specific area. The fractal dimension of bubble distribution of MSWI BA replacement sand concrete is between 1.833∼2.259, and that of ordinary concrete is between 2.138∼2.495. The compressive strength increases with the increase of the fractal dimension of bubble distribution.
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