Stabilization of Cr(III) wastes by C3S and C3S hydrated matrix: comparison of two incorporation methods

被引：0
作者：
Yang Lv
Xiangguo Li
Geert De Schutter
Baoguo Ma
机构：
[1] Ghent University,Magnel Laboratory for Concrete Research, Department of Structural Engineering
[2] Wuhan University of Technology,State Key Laboratory of Silicate Materials for Architectures
来源：
Materials and Structures | 2016年 / 49卷
关键词：
C; S; Cr; Polymorph; Hydration; Stabilization;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
In the present study, the influence of Cr(III) on the properties of C3S and its stabilization in C3S hydrates was investigated by either direct incorporation as Cr2O3 during C3S preparation or introduced as nitrate salt during hydration. Levels of Cr used were from 0.1 to 3.0 wt% of C3S. The effect of Cr on the polymorph and hydration of C3S and its immobilization in the hydrates was detected by means of DTA/TG, XRD, isothermal calorimeter and ICP-AES, etc. When doped during sintering process, Cr caused a C3S polymorph transformation from T1 to T2 and led a decomposition of C3S into C2S and CaO resulting in high f-CaO content. Cr doping showed an obvious promotion effect on the hydration properties. The promotion effect decreased when the Cr addition increased to 3.0 wt%. When Cr was added as nitrate salt, Cr showed a retardation effect on the hydration of C3S due to the formation of Ca2Cr(OH)7·3H2O, which resulted in a high degree of Cr stabilization.
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页码：3109 / 3118
页数：9
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[1]  
Chen QY(2007)Characterisation of products of tricalcium silicate hydration in the presence of heavy metals J Hazard Mater 147 817-825
[2]  
Hills CD(2007)Investigation into the stabilization/solidification performance of Portland cement through cement clinker phases J Hazard Mater 139 238-243
[3]  
Tyrer M(2010)Managing trace elements in Portland cement. Part I Interactions between cement paste and heavy metals Cem Concrete Compos 32 563-570
[4]  
Slipper I(2009)Stabilization of chromium-bearing electroplating sludge with MSWI fly ash-based Friedel matrices J Hazard Mater 165 955-960
[5]  
Shen HG(2006)Overview of waste stabilization with cement Waste Manag 26 689-698
[6]  
Brough A(2007)Production of cement clinkers from municipal solid waste incineration (MSWI) fly ash Waste Manag 27 1178-1189
[7]  
Qiao XC(2008)Recycling MSWI bottom and fly ash as raw materials for Portland cement Waste Manag 28 1113-1118
[8]  
Poon CS(2010)Reuse of water purification sludge as raw material in cement production Cem Concr Compos 32 436-439
[9]  
Cheeseman CR(2011)Evaluation of spray-dried sludge from drinking water treatment plants as a prime material for clinker manufacture Cem Concr Compos 33 267-275
[10]  
Gineys N(2012)Preparation of alinite cement from municipal solid waste incineration fly ash Cem Concr Compos 34 322-327
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