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231223s2011 xx |||||o 00| ||eng c |
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|a 10.1016/j.wasman.2010.05.015
|2 doi
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|a pubmed25n0665.xml
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|a (DE-627)NLM199401950
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|a (NLM)20609574
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Zheng, Lei
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Immobilization of MSWI fly ash through geopolymerization
|b effects of water-wash
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 29.03.2011
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2010 Elsevier Ltd. All rights reserved.
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|a The present research explored the role played by water-wash on geopolymerization for the immobilization and solidification of municipal solid waste incineration (MSWI) fly ash. The water-wash pretreatment substantially promoted the early strength of geopolymer and resulted in a higher ultimate strength compared to the counterpart without water-wash. XRD pattern of water-washed fly ash (WFA) revealed that NaCl and KCl were nearly eliminated in the WFA. Aside from geopolymer, ettringite (Ca(6)Al(2)(SO(4))(3)(OH)(12)·26H(2)O) was formed in MSWI fly ash-based geopolymer (Geo-FA). Meanwhile, calcium aluminate hydrate (Ca(2)Al(OH)(7)·3H(2)O), not ettringite, appeared in geopolymer that was synthesized with water-washed fly ash (Geo-WFA). Leached Geo-WFA (Geo-WFA-L) did not exhibit any signs of deterioration, while there was visual cracking on the surface of leached Geo-FA (Geo-FA-L). The crack may be caused by the migration of K(+), Na(+), and Cl(-) ions outside Geo-FA and the negative effect from crystallization of expansive compounds can not be excluded. Furthermore, transformation of calcium aluminate hydrate in Geo-WFA to ettringite in Geo-WFA-L allowed the reduction of the pore size of the specimen. IR spectrums suggested that Geo-WFA can supply more stable chemical encapsulation for heavy metals. Static monolithic leaching tests were conducted for geopolymers to estimate the immobilization efficiency. Heavy metal leaching was elucidated using the first-order reaction/diffusion model. Combined with the results from compressive strength and microstructure of samples, the effects of water-wash on immobilization were inferred in this study
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Aluminum Compounds
|2 NLM
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|a Calcium Compounds
|2 NLM
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|a Coal Ash
|2 NLM
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|a Metals, Heavy
|2 NLM
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|a Minerals
|2 NLM
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|a Particulate Matter
|2 NLM
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|a Water Pollutants, Chemical
|2 NLM
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| 650 |
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|a ettringite
|2 NLM
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|a Water
|2 NLM
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|a 059QF0KO0R
|2 NLM
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|a calcium aluminate
|2 NLM
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|a 12042-78-3
|2 NLM
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|a Carbon
|2 NLM
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|a 7440-44-0
|2 NLM
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| 700 |
1 |
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|a Wang, Chengwen
|e verfasserin
|4 aut
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1 |
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|a Wang, Wei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Shi, Yunchun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Gao, Xingbao
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Waste management (New York, N.Y.)
|d 1999
|g 31(2011), 2 vom: 15. Feb., Seite 311-7
|w (DE-627)NLM098197061
|x 1879-2456
|7 nnns
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| 773 |
1 |
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|g volume:31
|g year:2011
|g number:2
|g day:15
|g month:02
|g pages:311-7
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| 856 |
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|u http://dx.doi.org/10.1016/j.wasman.2010.05.015
|3 Volltext
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|a AR
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|d 31
|j 2011
|e 2
|b 15
|c 02
|h 311-7
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