期刊
JOURNAL OF CLEANER PRODUCTION
卷 177, 期 -, 页码 775-781出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.12.267
关键词
Lightweight; Metakaolin; Geopolymer; Municipal solid waste; Incineration bottom ash; Gas-forming agent
资金
- Environment Technology Research Program (ETRP), National Environment Agency, Singapore [ETRP 1301 104]
- Republic of Singapore's National Research Foundation
In this study, incineration bottom ash is used as the gas-forming agent, to replace costly aluminum powder, in the production of lightweight aerated metakaolin geopolymer. Results show that gas generation capacity of incineration bottom ash is about 1/250 that of aluminum powder. Addition of incineration bottom ash remarkably increases the yield stress and viscosity of fresh pastes. As a result, incineration bottom ash aerated geopolymers possess smaller voids because higher yield stress of paste restricts expansion of gas bubble and higher viscosity of paste prevents bubble coalescence. The resulting incineration bottom ash aerated geopolymers show comparable properties to the control aluminum aerated geopolymers, with a density of as low as 860 kg/m(3) and corresponding compressive strength of 5.5 MPa and thermal conductivity of 0.33 W/m-K. Incineration bottom ash thus can be considered as alternative gas-forming agent for lightweight aerated geopolymer production. (C) 2018 Elsevier Ltd. All rights reserved.
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