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硅酸盐通报 ›› 2017, Vol. 36 ›› Issue (8): 2673-2677.

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磷石膏-水泥-矿粉复合材料的性能研究

贺行洋;代飞;苏英;王迎斌;王庭苇   

  1. 湖北工业大学土木建筑与环境学院,武汉,430068
  • 出版日期:2017-08-15 发布日期:2021-01-18
  • 基金资助:
    国家自然科学基金(51372076)%湖北省科技支撑计划项目(2014BCB027)

Properties of Phosphogypsum-Portland Cement-Slag Composites

HE Xing-yang;DAI Fei;SU Ying;WANG Ying-bin;WANG Ting-wei   

  • Online:2017-08-15 Published:2021-01-18

摘要: 磷β半水石膏中掺入不同质量分数的水泥和矿粉,组成磷石膏-水泥-矿粉复合材料,主要研究了其耐水性能和体积稳定性,并且采用X射线衍射、扫描电子显微镜等技术分析硬化体的水化产物.结果表明:当水泥和矿粉的掺量分别为5%和25%的时候,其28d的软化系数为0.85,同时体积稳定性好.水泥和矿粉水化过程中,生成的主要产物水化硅酸钙(C-S-H)和钙矾石(AFt)会包裹磷石膏晶体,填充在硬化体的空隙之中,并且二水石膏晶体形貌由交错排列的短粗状变为板状.

关键词: 磷β半水石膏;水泥;矿粉;耐水性能

Abstract: Water resistance and volume stability of Phosphogypsum-Portland Cement-Slag Composites were studied. The hydration products were characterized by X-ray diffraction and microstructure. The results indicate that addition of portland cement and slag are 5% and 25% respectively, softening coefficient were enhanced to 0.85 at the age of 28 d and volume stability of hardened composites are well optimized. The main hydration products of Phosphogypsum-Portland Cement-Slag Composites are hydrated calcium silicate and ettringite, which filled in the phosphogypsum crystals and hardened body, and the crystal morphology of dihydrate gypsum change from short prismatic to acicular crystal.

Key words: β semi-water phosphogypsum;cement;slag;water resistance

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