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Microstructure and Strength of Alkali-Activated Bricks Containing Municipal Solid Waste Incineration (MSWI) Fly Ash Developed as Construction Materials

Author

Listed:
  • Peng Xu

    (State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Qingliang Zhao

    (State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Wei Qiu

    (State Key Laboratory of Urban Water Resources and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China)

  • Yan Xue

    (Harbin Institute of Technology Environment Group CO., LTD; Harbin 150028, China)

  • Na Li

    (School of Humanities, Social Sciences & Law, Harbin Institute of Technology, Harbin 150090, China)

Abstract

Alkali-activated materials (AAM) are widely applied in the field of building materials and civil engineering to substitute cement materials. This study used two types of municipal solid waste incineration fly ash (MSWI-FA): grate-firing fly ash (GFFA) and fluidized bed fly ash (FBFA) as brick raw materials. Various weight ratio of 20%, 30%, and 40% GFFA and FBFA were added to coal fly ash (CFA), GGBFs (Ground Granulated Blast-Furnace Slag), and an alkali-activating reagent to produce alkali-activated bricks. Microstructure and crystalline phase composition were observed to analyze their compressive strength, and a leaching test was used to prove the material’s safety for the environment. It can be seen from the results of this study that the alkali-activated bricks containing FBFA had higher compressive strength than those containing GFFA in the same amount. Considering the engineering properties, the alkali-activated bricks containing FBFA are more suitable to be used as building materials. The difference in the compressive strength resulted from the large amount of calcium compounds and chloride salts present in the GFFA. From SEM analysis, it was observed that there was a large number of pores in the microstructure. It was also found from the results of XRD that the bricks containing GFFA contained a large amount of chloride salt. From the results of the two leaching tests, it was found that the amounts of six heavy metals detected in the leachates of the bricks in this study met the corresponding regulation standards. This described MSWI-FA is suitable for use as alkali-activated material, and its products have potential to be commercially used in the future.

Suggested Citation

  • Peng Xu & Qingliang Zhao & Wei Qiu & Yan Xue & Na Li, 2019. "Microstructure and Strength of Alkali-Activated Bricks Containing Municipal Solid Waste Incineration (MSWI) Fly Ash Developed as Construction Materials," Sustainability, MDPI, vol. 11(5), pages 1-12, March.
    • Handle: RePEc:gam:jsusta:v:11:y:2019:i:5:p:1283-:d:209962
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    References listed on IDEAS

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    1. Charles H. K. Lam & Alvin W. M. Ip & John Patrick Barford & Gordon McKay, 2010. "Use of Incineration MSW Ash: A Review," Sustainability, MDPI, vol. 2(7), pages 1-26, July.
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    Cited by:

    1. Dezhi Zou & Xiaona Wang & Chuanfu Wu & Teng Li & Menglu Wang & Shu Liu & Qunhui Wang & Takayuki Shimaoka, 2020. "Dechlorination of Municipal Solid Waste Incineration Fly Ash by Leaching with Fermentation Liquid of Food Waste," Sustainability, MDPI, vol. 12(11), pages 1-11, May.
    2. Arif Ali Baig Moghal & Ateekh Ur Rehman & K Venkata Vydehi & Usama Umer, 2020. "Sustainable Perspective of Low-Lime Stabilized Fly Ashes for Geotechnical Applications: PROMETHEE-Based Optimization Approach," Sustainability, MDPI, vol. 12(16), pages 1-19, August.

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