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《Journal of South China University of Technology(Natural Science Edition)》 2016-06
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Effect of Calcium Sulfate on Early Hydration of Calcium Aluminate Cement-Based Blends

XU Ling-lin;WANG Pei-ming;YANG Xiao-jie;Horst-Michael LUDWIG;Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education,Tongji University;F.A.Finger-Institute for Building Materials Science,Bauhaus-Universitt Weimar;  
This paper deals with the heat release and paste microstructure during the early hydration of calcium aluminate cement-Portland cement-calcium sulfate( anhydrite or α-hemihydrate) blends by means of calorimetry,Xray diffraction,environmental scanning electronic microscopy and mercury intrusion porosimetry. The results show that( 1) when calcium sulfate is blended with the binder,the early hydration accelerates and is dominated by the formation of ettringite as well as the corresponding transition into hydrated mono-sulphate;( 2) in the first 30 minutes of hydration,short and coarse ettringite in a length of about 1 μm forms in the matrix,which leads to the occurrence of the first heat evolution peak;( 3) in the following 8 hours,another two obvious heat evolution peaks occur,one resulting from the dissolution of calcium aluminates and anhydrite as well as the formation of etttingite in the paste with anhydrite,the other resulting from the growth of etttingite and the formation of mono-sulphate;( 4) for the paste with α-hemihydrate,both of these two peaks are attributed to the formation and growth of etttingite;and( 5) thanks to its rapider dissolution than anhydrite,α-hemihydrate matches well with the dissolution of calcium aluminate,so that the paste with α-hemihydrate contains more ettringite and exhibits lower porosity.
【Fund】: 国家自然科学基金资助项目(51402216;51308406);; 硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金资助项目(SYSJJ2014-10);; 国家“十二五”科技支撑计划项目(2012BA20B02)~~
【CateGory Index】: TU528
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 XU Linglin;WANG Peiming;Geert DE SCHUTTER;WU Guangming;School of Materials Science and Engineering, Tongji University;Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University;Magnel Laboratory for Concrete Research, Faculty of Engineering, Ghent University, Belgium;;Effect of Calcium Aluminate Cement Variety on the Hydration of Portland Cement in Blended System[J];Journal of Wuhan University of Technology(Materials Science Edition);2014-04
【Co-citations】
Chinese Journal Full-text Database 1 Hits
1 XU Ling-lin;WANG Pei-ming;YANG Xiao-jie;Horst-Michael LUDWIG;Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education,Tongji University;F.A.Finger-Institute for Building Materials Science,Bauhaus-Universitt Weimar;;Effect of Calcium Sulfate on Early Hydration of Calcium Aluminate Cement-Based Blends[J];华南理工大学学报(自然科学版);2016-06
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