Polymorph Transformation of Tricalcium Silicate Doped with Heavy Metal  

作　　者：吕阳 李相国 MA Baoguo De SCHUTTER Geert 

机构地区：[1]Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, Technologiepark-Zwijinaarde 904, Ghent 9052, Belgium [2]State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2016年第4期883-890,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(51002110);the Fundamental Research Funds for the Central Universities(2012-IV-025);the State Scholarship Program of China Scholarship Council

摘　　要：The aim of the present study was to investigate the influence of heavy metals on the polymorph transformation of tricalcium silicate.Heavy metal（0.1wt% to 3.0wt%） of Cr,Zn,Cu,Ni and Pb（in oxides form） was added into the raw mixtures and then sintered together three times at 1450 ℃ for 2 h.The f-CaO content of doped C3S was determined by the glycerol-ethanol method,and their polymorph transformation was investigated by means of XRD and FTIR.Thermal analysis（DTA/DTG） was conducted to determine the reaction temperatures and mass losses during the sintering process of raw mixtures.The concentration of heavy metal in C3S after sintering was determined by ICP-AES.The experimental results indicate that heavy metal doping contributes to a higher symmetry of C3S except for Pb.Addition of up to 3.0wt%,Cr will lead to a decomposition of C3S into C2S and CaO;Zn will cause a transformation from T1 to M2 polymorph,and then to R polymorph;Cu and Ni cause a gradual transformation from T1 to T2 and then to M1 and/or M2 polymorph.During the sintering process,all the Pb releases into atmosphere because of evaporation.The aim of the present study was to investigate the influence of heavy metals on the polymorph transformation of tricalcium silicate.Heavy metal（0.1wt% to 3.0wt%） of Cr,Zn,Cu,Ni and Pb（in oxides form） was added into the raw mixtures and then sintered together three times at 1450 ℃ for 2 h.The f-CaO content of doped C3S was determined by the glycerol-ethanol method,and their polymorph transformation was investigated by means of XRD and FTIR.Thermal analysis（DTA/DTG） was conducted to determine the reaction temperatures and mass losses during the sintering process of raw mixtures.The concentration of heavy metal in C3S after sintering was determined by ICP-AES.The experimental results indicate that heavy metal doping contributes to a higher symmetry of C3S except for Pb.Addition of up to 3.0wt%,Cr will lead to a decomposition of C3S into C2S and CaO;Zn will cause a transformation from T1 to M2 polymorph,and then to R polymorph;Cu and Ni cause a gradual transformation from T1 to T2 and then to M1 and/or M2 polymorph.During the sintering process,all the Pb releases into atmosphere because of evaporation.

关 键 词：Transformation sintering evaporation doping mixtures sintered silicate glycerol ethanol attributed 

分 类 号：TQ132.32[化学工程—无机化工]