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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共 85 条
[11]  
Aouad G(1997)An NMR, XRD and EDS study of solidification/stabilization of chromium with Portland cement and C J Hazard Mater 56 21-34
[12]  
Damidot D(2011)S J Hazard Mater 191 296-305
[13]  
Qian GR(1998)Chromium behavior during cement-production processes: a clinkerization, hydration, and leaching study J Hazard Mater 60 1-28
[14]  
Yang XY(1999)Containment mechanism of trivalent chromium in tricalcium silicate Cem Concr Res 29 545-552
[15]  
Dong SX(1967)Influence of Cr, Ni and Zn on the properties of pure clinker phases. Part I. C J Am Ceram Soc 50 609-619
[16]  
Zhou JZ(1972)S J Am Ceram Soc 55 309-312
[17]  
Sun Y(1963)Polymorphism of tricalcium silicate and its solid solutions Zement-Klak-Gips 16 370-375
[18]  
Xu YF(1963)Structure and reactivity of chromium-doped tricalcium silicate Prikladnoi Khimii 36 2642-2647
[19]  
Liu Q(2012)Chemical and structural investigations on the solid solutions of tricalcium silicate Adv Cem Res 2496 359-364
[20]  
Batchelor B(2000)Chromalite in Portland cement clinker. translation from: Zhurnal Cem Concr Res 30 1361-1365
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