期刊
WASTE MANAGEMENT
卷 105, 期 -, 页码 425-432出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2020.02.017
关键词
MSWIFA; Pretreatment; Cement-stabilized soil; Synergistic effect; Unconfined compressive strength
资金
- National Natural Science Foundation of China [51508109]
- Guangdong Nature Science Fund Projects [2016A030313692, 2017A030310244]
In this study, the feasibility of using municipal solid waste incineration fly ash (MSWIFA) as additive for the strengthening of pretreated cement-stabilized soil was evaluated. Results indicated that the leaching concentrations of chromium and lead in MSWIFA after the water washing process and addition of 4% ferrous sulphate were reduced by 67% and 89%, respectively, which was lower than the limit value of Identification standard for hazardous waste (GB 5085.3-2007). After pretreatment, MSWIFA samples with ratios of 5% and 10% were blended into cement-stabilized soil with ordinary Portland cement (OPC) content of 10%, 15% and 20%. The unconfined compressive strength (UCS), internal friction angle and cohesion of the cement-stabilized soil increased with OPC and pretreated MSWIFA (PFA) content. The same effect was observed on UCS after the addition of 10% PFA as replacement of 5% OPC. In the subsequent X-ray powder diffraction test, scanning electron microscopy and leaching tests, the leaching concentrations of heavy metals in cement-stabilized soil became far lower than the limit value under the synergistic effects of the physical encapsulation of hydration products and stabilization of chemical agents. The incorporation of PFA as a Supplementary material can effectively accelerate the formation of hydration products and can thus provide cleaner options for foundation reinforcement. (C) 2020 Elsevier Ltd. All rights reserved.
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