过硫磷石膏矿渣水泥性能调控研究进展

doi:10.16552/j.cnki.issn1001-1625.2024.1607

摘要/Abstract

摘要： 过硫磷石膏矿渣水泥(PESSC)是一种具有低水化热、高体积稳定性、强抗硫酸盐侵蚀能力的新型免煅烧胶凝材料。由于磷石膏内部杂质的持续释放及PESSC特殊的低碱度高硫酸盐水化环境,PESSC基体存在凝结硬化慢、抗碳化能力差、长期性能不稳定等问题,从而限制了其应用。现阶段,亟需寻求可有效调节PESSC水化环境、促进高稳定水化相生成、优化基体微结构的途径,并形成系统的PESSC设计理论与性能调控方法。本工作从PESSC的基本组成及物化特性出发,围绕磷石膏中杂质溶出对石膏结晶、PESSC水化硬化的影响,碱-硫酸盐复合激发矿粉水化机制及其对性能发展的影响,全面探讨了通过磷石膏预处理加速凝结、碱激发调控水化环境推动持续反应、多组分协同水化优化长期性能、改性剂调控稳定水化相生成以提高基体耐久性能的可行性,旨在为发展PESSC体系新理论、新方法提供理论指导。

关键词: 过硫磷石膏矿渣水泥, 活性掺合料, 组成设计, 凝结硬化, 杂质固化, 碱激发

Abstract: Phosphogypsum-based excess-sulphate slag cement (PESSC), as a non-calcined cementitious material, offers benefits such as minimal heat release, great volumetric stability, and significant resistance to sulphate erosion. Nonetheless, its application is constrained by prolonged setting periods, inadequate carbonation resistance, and poor stability of long-term performance due to the persistent release of impurity derived from phosphogypsum, as well as the sulphate-rich and low alkalinity hydration environment. Recently, effective strategies are needed to regulate the hydration environment of PESSC, enhance the formation of highly stable hydrates, optimise the microstructure of matrix, and provide systematic design theories and performance regulation methodologies. This study focuses on the impact of impurity release on gypsum crystallisation and the hydration hardening of PESSC, as well as the mechanisms and performance advancements of alkali and sulphate-activated slag, bases on the fundamental physical and chemical features of the raw components. A comprehensive discussion is presented on the feasibility of accelerating condensation through phosphogypsum pretreatment, promoting sustainable reactions by adding appropriate alkali-activators to regulate the hydration environment, enhancing the long-term performance and durability of PESSC by synergizing multiple components, and generating stable hydrates by incorporating modifiers. This work seeks to offer theoretical and technological support for the development of new theories and methodologies for PESSC design and large-scale applications.

Key words: phosphogypsum-based excess-sulphate slag cement, active admixture, component design, concretion and hardening, impurity solidification, alkali activation

中图分类号:

TQ172.4

王紫嫣, 孙涛, 欧阳高尚. 过硫磷石膏矿渣水泥性能调控研究进展[J]. 硅酸盐通报, 2025, 44(4): 1208-1226.

WANG Ziyan, SUN Tao, OUYANG Gaoshang. Review on Performance Regulation of Phosphogypsum-Based Excess-Sulphate Slag Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1208-1226.

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