无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (3): 98-103.doi: 10.19964/j.issn.1006-4990.2022-0269

• 环境·健康·安全 • 上一篇    下一篇

α-半水石膏对水泥砂浆性能的影响与水化机理研究

李鹏1(), 王立坤2, 孟秋燕3()   

  1. 1.河北地质大学华信学院, 河北 石家庄 056000
    2.韩国加图立大学, 韩国 富川 14543
    3.河北工程技术学院土木工程学院, 河北 石家庄 050000
  • 收稿日期:2022-06-13 出版日期:2023-03-10 发布日期:2023-03-17
  • 通讯作者: 孟秋燕(1987— ),女,硕士,讲师,研究方向为土木工程材料。E-mail:2327767275@qq.com
  • 作者简介:李鹏(1981— ),女,硕士,副教授,研究方向为建筑材料与工程管理;E-mail:he56653938@163.com
  • 基金资助:
    国家自然科学基金(42172248)

Study on effect of α-hemihydrate gypsum on performance of cement mortar and its hydration mechanism

LI Peng1(), WANG Likun2, MENG Qiuyan3()   

  1. 1. Huaxin College,Hebei University of Geosciences,Shijiazhuang 056000,China
    2. Cato University,Bucheon 14543,Korea
    3. College of Civil Engineering,Hebei University of Engineering and Technology,Shijiazhuang 050000,China
  • Received:2022-06-13 Online:2023-03-10 Published:2023-03-17

摘要:

为了提高注浆用水泥砂浆的性能,采用α-半水石膏取代部分水泥进行材料改性,分析了α-半水石膏与尾砂含量对水泥砂浆坍落度、收缩率、强度与耐久性等的影响,依据微观实验和矿物成分分析结果对水泥砂浆的水化机理进行了分析。结果发现:采用α-半水石膏取代部分水泥有利于提高水泥砂浆的流动性,并降低其干燥收缩率;当α-半水石膏取代率为15%时,水泥砂浆的和易性、强度和耐久性均得到了显著改良;α-半水石膏具有化学活性,可以促进胶凝材料的二次水化反应,进而增加水泥砂浆的密实度。该研究对制备绿色环保、高性能的注浆水泥砂浆具有重要的参考作用。

关键词: 水泥砂浆, α-半水石膏, 改性, 微观结构

Abstract:

In order to improve the performance of cement mortar for grouting,α-hemihydrate gypsum was used to replace part of cement for material modification.The effects of α-phosphogypsum content and tailings content on slump,shrinkage,strength,and durability were analyzed.The hydration mechanism of cemental slurry was studied according to the microscopic experiment and mineral composition results.The results showed that using α-phosphogypsum to replace part of cement was beneficial to improve the workability index of cement mortar and reduce the drying shrinkage rate.When the replacement ratio was 15%,the workability,strength and durability of the slurry were significantly improved.The chemical activity of α-phosphogypsum could promote the secondary hydration of the cementitious material and increase the compactness of the filling slurry.This study had important reference function for the preparation of a high-performance composite cement materials.

Key words: cement mortar, α-hemihydrate gypsum, modification, microstructure

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