期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 266, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2020.120890
关键词
Municipal solid waste incineration; Incineration bottom ash; Supplementary cementitious material; Waste reuse; Dry-cast concrete
资金
- Natural Science and Engineering Research Council (NSERC) of Canada
- Emerald Energy from Waste (EFW) incinerator in Brampton, Ontario, Canada
This study evaluates the feasibility of using MSWI-BA as a partial replacement for cement in dry-cast concrete, showing that BA concrete has higher strength and durability compared to ordinary Portland cement concrete. Additionally, the addition of BA in dry-cast concrete improves resistance to freeze-thaw damage.
This study evaluates the feasibility of partially replacing Portland cement in concrete with bottom ash (BA) from municipal solid waste incineration (MSWI). The challenge with this ash lies in its susceptibility to react expansively in alkaline conditions, leading to cracking when used in conventional high-slump concrete. This expansive behavior was confirmed to be the result of the dissolution of the ash's aluminum metal content and consequent formation of hydrogen gas. The aim of this study was to explore the suitability of BA as a cementitious additive in zero-slump dry-cast concrete instead. The premise was that dry-cast could better diffuse the generated gas and avoid internal pressure build-up. Results from isothermal calorimetry and thermal gravimetric analysis (TGA) clearly correlate enhancements in early-age cement hydration and pozzolanic reactivity. Scanning electron microscope (SEM) images revealed voids channels and larger aggregation formation in the BA applied concrete paste. Dry-cast concrete containing 20% BA replacement of cement exhibited higher strengths than ordinary Portland cement (OPC) reference samples at every test age up to 90 days, with the ultimate strength of BA concrete being 18% higher than that of OPC concrete. The addition of BA also improved resistance to freeze-thaw damage. The study found that MSWI-BA can impart enhancements to dry-cast concrete, qualifying it as a potentially suitable supplementary cementitious material. Use of this otherwise landfilled ash as raw feedstock in concrete-making demonstrates a greener approach to building - scoring favorably in environmental performance for being relevant to resource conservation, landfill diversion, and waste-recycling. (C) 2020 Elsevier Ltd. All rights reserved.
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