期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 205, 期 -, 页码 368-376出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.01.104
关键词
MSWI bottom ash sludge (MSWI-BAS); Lightweight aggregates (LWA); Oxides; Influence mechanism
资金
- National Key R&D Program, China [2018YFD1101000]
For the utilization of municipal solid waste incineration bottom ash sludge (MSWI-BAS), the production of lightweight aggregates (LWA) was carried out using it as raw materials. SiO2, Al2O3 and CaO were the major oxides in MSWI-BAS, so their effect on characteristics of LWA was investigated to optimize the process. Results showed that the increase in SiO2 content from 25% to 40% caused the good growth of the structure with Si and O as the skeleton, leading to LWA with increased compressive strength and particle density from 0.5 to 6.18 MPa and from 755 to 1268 kg/m(3) respectively, and reduced 1 h water absorption from 50% to 14%. Lower strength LWA with more pores and amorphous phases were obtained at 20% <= Al2O3 <= 30% because excessive Al2O3 inhibited the crystallization inside the products. Dramatic changes occurred when CaO increased from 21% to 22% with compressive strength and particle density from 8.82 to 2.02 MPa and from 1300 to 862 kg/m(3) respectively, and 1 h water absorption from 4% to 36%, indicating that more CO2 was produced. This attempt to utilize MSWI-BAS can produce high-performance LWA that meets the sustainability philosophy and reduces the cost of waste treatment and lightweight aggregates production. (C) 2019 Elsevier Ltd. All rights reserved.
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