Study of aluminum sulfate and anhydrite on cement hydration process

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• 作者：Jianguo Han ; Kejin Wang ; Yue Wang ; Jiyao Shi
• 关键词：Cement ; Aluminum sulfate ; Anhydrite ; Hydration ; AFt ; Amorphous AFm ; MS
• 刊名：Materials and Structures
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：49
• 期：4
• 页码：1105-1114
• 全文大小：1,420 KB
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• 作者单位：Jianguo Han (1) (2)
  Kejin Wang (2)
  Yue Wang (3)
  Jiyao Shi (3)
  
  1. Department of Civil Engineering, Tsinghua University, Beijing, 100084, China
  2. Department of Civil, Construction and Environmental Engineering, Iowa State University, Ames, IA, 50014, USA
  3. Technology Center of China Railway Tunnel Co., Ltd, Luoyang, 471000, China
  
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873

文摘

The influences of aluminum sulfate (AS) introduction and dosage on setting time, hydration heat evolution, hydration product type and pore structure of Portland cement were studied, and the influence of AS on concrete strength was investigated also. The results indicate that AS can effectively accelerate setting time of Portland cement and enhance concrete at early age (1 day) strength. AS can promote hydration process of calcium aluminate but inhibit that of calcium silicate. The effect of AS on hydration process becomes more significant along with the increased dosage; and the introduction of AS can promote the formation of AFt. The research results of this paper favor the opinion of the existence of AFt precursor; and the AFt precursor is amorphous AFm which could not be identified by XRD. With anhydrite as setting regulator, the amorphous AFm retention time is prolonged, and the endothermal peaks produced by amorphous AFm during DSC–MS measurement correspond to 80–160 and 830–910 °C, losing H₂O and SO₂ respectively.