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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (7): 2215-2225.DOI: 10.16552/j.cnki.issn1001-1625.2025.1297

• 水泥混凝土 •    下一篇

超硫酸盐水泥的化学收缩特性研究

张雪梅1(), 靳晴晴1, 常硕1, 王露1, 李照祺2, 张兴照2, 刘数华1()   

  1. 1.武汉大学水资源工程与调度全国重点实验室,武汉 430072
    2.中铁建设集团有限公司,北京 100040
  • 收稿日期:2025-12-25 修订日期:2026-02-27 出版日期:2026-07-15 发布日期:2026-08-13
  • 通信作者: 刘数华,博士,教授。E-mail:shliu@whu.edu.cn
  • 作者简介:张雪梅(2001—),女,博士研究生。主要从事水工材料方面的研究。E-mail:zhangxuemei6312@whu.edu.cn
  • 基金资助:
    中铁建设集团有限公司科研计划课题(25-24c)

Chemical Shrinkage Characteristics of Supersulfated Cement

ZHANG Xuemei1(), JIN Qingqing1, CHANG Shuo1, WANG Lu1, LI Zhaoqi2, ZHANG Xingzhao2, LIU Shuhua1()   

  1. 1.State Key Laboratory of Water Resources Engineering and Management,Wuhan University,Wuhan 430072,China
    2.China Railway Construction Group Co.,Ltd.,Beijing 100040,China
  • Received:2025-12-25 Revised:2026-02-27 Published:2026-07-15 Online:2026-08-13

摘要:

化学收缩引起的体积变形,易导致材料开裂,破坏结构完整性。超硫酸盐水泥作为一种新型低碳胶凝材料,其水化过程、化学收缩特性与传统硅酸盐水泥具有显著差异。本文采用粒化高炉矿渣、磷石膏及水泥熟料制备磷石膏超硫酸盐水泥(SSC),探索磷石膏改性、磷石膏掺量、熟料掺量和水胶比对SSC化学收缩的影响,并结合微观测试表征探讨影响机理。结果表明,在7 d龄期时,SSC体系化学收缩值约为0.046 mL/g,大约占普通硅酸盐水泥(OPC)的77%,煅烧磷石膏超硫酸盐水泥(CSSC)的化学收缩值较SSC降低了17.39%,而石灰中和磷石膏超硫酸盐水泥(NSSC)的化学收缩值较SSC体系增加了65.21%。随着磷石膏掺量的增加,SSC化学收缩增加,磷石膏掺量为13%(质量分数,下同)时,化学收缩最小。随熟料掺量的增加,SSC的化学收缩值先减小后增大。当熟料掺量为5%(质量分数)时,化学收缩值最小。对于SSC体系,随着水胶比的增加,化学收缩值降低。而15%磷石膏与5%熟料的协同作用,可以实现钙矾石生成量与水化硅酸钙(C-S-H)凝胶结构的最佳匹配,达到化学收缩调控最优值。

关键词: 超硫酸盐水泥, 化学收缩, 机理, 磷石膏改性, 磷石膏掺量, 熟料掺量

Abstract:

Volume deformation caused by chemical shrinkage readily leads to material cracking, compromising structural integrity. As a novel low-carbon cementitious material, supersulfated cement exhibits significant differences in its hydration process and chemical shrinkage characteristics compared to traditional Portland cement. This study employed granulated blast furnace slag, phosphogypsum and cement clinker to prepare phosphogypsum-based supersulfated cement (SSC), investigating the effects of phosphogypsum modification, phosphogypsum content, clinker content and water-binder ratio on SSC chemical shrinkage. The influence mechanisms were explored through microscopic testing characterisation. The results indicate that the chemical shrinkage value of SSC is approximately 0.046 mL/g at 7 d, accounting for roughly 77% of ordinary Portland cement (OPC). Calcined phosphogypsum-based supersulfated cement (CSSC) exhibits a 17.39% reduction in chemical shrinkage value compared to SSC, while lime-neutralized phosphogypsum-based supersulfated cement (NSSC) shows the 65.21% increase in chemical shrinkage value relative to SSC. With increasing phosphogypsum content, the chemical shrinkage of SSC increases, reaching its minimum at 13% (mass fraction, the same below) phosphogypsum content. As the clinker content increases, the chemical shrinkage value of SSC initially decreases and then increases. The chemical shrinkage value is minimal at a 5% (mass fraction) clinker content. For SSC, chemical shrinkage value decreases with increasing water-binder ratio. The synergistic effect of 15% phosphogypsum and 5% clinker achieves optimal matching between ettringite formation and calcium silicate hydrate (C-S-H) gel structure, thereby attaining the optimum value for chemical shrinkage control.

Key words: supersulfated cement, chemical shrinkage, mechanism, phosphogypsum modification, phosphogypsum content, clinker content

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