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Performance of structural concrete using Waste-to-Energy (WTE) combined ash.

Authors
  • Tian, Yixi1
  • Bourtsalas, A C Thanos2
  • Kawashima, Shiho3
  • Ma, Siwei4
  • Themelis, Nickolas J2
  • 1 Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA. Electronic address: [email protected]
  • 2 Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA.
  • 3 Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027, USA.
  • 4 Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027, USA; Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA.
Type
Published Article
Journal
Waste management (New York, N.Y.)
Publication Date
Sep 03, 2020
Volume
118
Pages
180–189
Identifiers
DOI: 10.1016/j.wasman.2020.08.016
PMID: 32892094
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

In the U.S., about 27 million metric tons of municipal solid waste are used as fuel in Waste-to-Energy (WTE) power plants, generating about seven million tons of mixed bottom ash and fly ash (combined ash) annually, which are disposed of in landfills after metal separation. This study assessed the effect of using combined ash as a substitute of mined stone aggregates on the mechanical properties and leachability of cement mortar and concrete. The as-received combined ash was separated into three fractions: fine (<2 mm), medium (2-9.5 mm), and coarse (9.5-25 mm). The substitution of up to 100% of stone aggregate by the coarse and medium fractions of combined ash produced concrete with compressive strength exceeding 28 MPa after 28 days of curing. Similar results were obtained when the fine combined ash was used as a sand substitute, at 10 wt%, in mortar. The concrete specimens were subjected to several days of curing and mechanical testing. The results were comparable to the properties of commercial concrete products. The mechanical test results were supplemented by XRD and SEM analysis, and leachability tests by EPA Method 1313 showed that the optimal concrete products effectively immobilized the heavy metals in the combined ash. Copyright © 2020 Elsevier Ltd. All rights reserved.

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