Recycling municipal incinerator fly- and scrubber-ash into fused slag for the substantial replacement of cement in cement-mortars |
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| Authors: | Tzen-Chin Lee Ming-Kang Rao |
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| Institution: | 1. Eindhoven University of Technology, Department of the Built Environment, Eindhoven, The Netherlands;2. Van Gansewinkel Minerals, Eindhoven, The Netherlands;3. ECN, Petten, The Netherlands;4. ASCEM, Rheden, The Netherlands;5. LBPSIGHT, Nieuwegein, The Netherlands;1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, P.R. China;2. Key Laboratory of Polymeric Materials & Application Technology of Hunan Province, Key Laboratory of Advanced Functional Polymeric Materials of College of Hunan Province, and Key Lab of Environment-Friendly Chemistry and Application in Ministry of Education, Xiangtan University, Xiangtan 411105, Hunan Province, P.R. China;1. Scientific Research Centre Bistra Ptuj, Slovenski trg 6, SI-2250, Ptuj, Slovenia;2. Local Energy Agency Spodnje Podravje, Pre?ernova ulica 18, SI-2250, Ptuj, Slovenia;3. Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova ulica 17, SI-2000, Maribor, Slovenia;1. School of Civil and Environmental Engineering, Harbin Institute of Technology, Shenzhen 518055, China;2. School of Urban Construction, Yangtze University, Jingzhou 434023, China;3. College of Civil Engineering, Huaqiao University, Xiamen 361021, China |
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| Abstract: | Fly- and scrubber-ash (weight ratio of approximately 1:3) from municipal solid waste incinerators (MSWI) are a major land-fill disposal problem due to their leaching of heavy metals. We uniformly mixed both types of ash with optimal amounts of waste glass frit, which was then melted into a glassy slag. The glassy slag was then pulverized to a particle size smaller than 38 μm for use as a cement substitute (20–40% of total cement) and blended with sand and cement to produce slag-blended cement-mortar (SCM) specimens. The toxicity characteristics of the leaching procedure tests on the pulverized slag samples revealed that the amount of leached heavy metals was far below regulatory thresholds. The compressive strength of the 28-day cured SCM specimens was comparable to that of ordinary Portland cement mortars, while the compressive strength of specimens cured for 60 or 90 days were 3–11% greater. The observed enhanced strength is achieved by Pozzolanic reaction. Preliminary evaluation shows that the combination of MSWI fly- and scrubber-ash with waste glass yields a cost effective and environmentally friendly cement replacement in cement-mortars. |
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