磷石膏对矿渣-水泥胶凝体系固化软黏土力学性能及抗渗性能的影响机制

doi:10.16552/j.cnki.issn1001-1625.2025.0541

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (12): 4480-4491.DOI: 10.16552/j.cnki.issn1001-1625.2025.0541

磷石膏对矿渣-水泥胶凝体系固化软黏土力学性能及抗渗性能的影响机制

孙涛^1,2, 刘越^1,3, 王紫嫣^1,3, 欧阳高尚^1,3, 钦庭轩^1,3

1.武汉理工大学硅酸盐科学与先进建材国家重点实验室,武汉 430070;
2.中山市武汉理工大学先进工程技术研究院,中山 528437;
3.武汉理工大学材料科学与工程学院,武汉 430070

收稿日期:2025-05-29 修订日期:2025-07-10 出版日期:2025-12-15 发布日期:2025-12-30
作者简介:孙涛(1980—),男,博士,研究员。主要从事软土固化领域的研究。E-mail:sunt@whut.edu.cn
基金资助:
国家自然科学基金面上项目(52378261)

Influence Mechanism of Phosphogypsum on Mechanical Properties and Impermeability of Soft Clay Solidified with Slag-Cement Cementitious System

SUN Tao^1,2, LIU Yue^1,3, WANG Ziyan^1,3, OUYANG Gaoshang^1,3, QIN Tingxuan^1,3

1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;
2. Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City, Zhongshan 528437, China;
3. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;

Received:2025-05-29 Revised:2025-07-10 Published:2025-12-15 Online:2025-12-30

摘要/Abstract

摘要： 软黏土含水率高、塑性大且强度极低,极易引发地基失稳和沉降等工程危害。本研究以磷石膏、矿渣和普通硅酸盐水泥复合组成的固化剂对软黏土进行了固化处理,磷石膏逐步等量替换固化剂中的惰性石粉,单变量研究了磷石膏在体系中的作用。首先,基于pH试验、X射线衍射试验、扫描电子显微镜试验和热重试验研究了固化土的微观结构演化从而得出固化机制。其次,通过无侧限抗压强度试验、直剪试验和渗透试验研究了固化剂中磷石膏质量占比对固化土力学性能及抗渗性能的作用规律。结果表明,固化剂的主要水化产物为水化硅(铝)酸钙(C-(A)-S-H)凝胶和钙矾石,磷石膏通过对矿粉的硫酸盐激发作用提高了固化剂的水化程度,促进了体系内钙矾石的生成,凝胶的胶结作用和钙矾石的膨胀填充作用共同提高了固化软土的力学性能和抗渗性能。随着固化剂中磷石膏质量占比逐步提升,固化土的无侧限抗压强度、抗剪强度均显著增强,最优配比条件下满足通常软土地基加固验收标准,渗透系数降低一个数量级(10^-7降低至10^-8)。

关键词: 软黏土, 磷石膏基土体固化剂, 力学性能, 抗渗性能, 固化机制

Abstract: Soft clay has a high moisture content, high plasticity and extremely low strength, which can easily cause engineering hazards such as foundation instability and settlement. This study used a stabilizer composed of phosphogypsum, slag and ordinary Portland cement to solidify high moisture content soft clay. By gradually replacing the inert stone powder in the soil stabilizer with equal amounts of phosphogypsum, a univariate study of phosphogypsum was conducted to investigate its role in the system. Firstly, the microstructure evolution of solidified soil was studied based on pH test, X-ray diffraction test, scanning electron microscopy test and thermogravimetric test to determine the solidification mechanism. Secondly, the effect of phosphogypsum mass proportion in the stabilizer on the mechanical properties and impermeability of the solidified soil was studied through unconfined compressive strength test, direct shear test and permeability test. The results show that the main hydration products of the stabilizer are calcium (alumino) silicate hydrate (C-(A)-S-H) gel and ettringite. Phosphogypsum increases the hydration degree of the stabilizer and promotes the formation of ettringite in the system by stimulating the sulfate excitation effect on slag. The cementation of gel and the expansion and filling of ettringite jointly improve the mechanical properties and impermeability of solidified soft soil. With the gradual increase in the mass proportion of phosphogypsum in the stabilizer, the unconfined compressive strength and shear strength of the solidified soil are significantly enhanced. Under the optimal ratio conditions, it meets the usual acceptance criteria for soft soil foundation reinforcement, and the permeability coefficient is decreased by an order of magnitude (from 10^-7 to 10^-8).

Key words: soft clay, phosphogypsum based soil stabilizer, mechanical property, impermeability, solidification mechanism

中图分类号:

TU447

孙涛, 刘越, 王紫嫣, 欧阳高尚, 钦庭轩. 磷石膏对矿渣-水泥胶凝体系固化软黏土力学性能及抗渗性能的影响机制[J]. 硅酸盐通报, 2025, 44(12): 4480-4491.

SUN Tao, LIU Yue, WANG Ziyan, OUYANG Gaoshang, QIN Tingxuan. Influence Mechanism of Phosphogypsum on Mechanical Properties and Impermeability of Soft Clay Solidified with Slag-Cement Cementitious System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(12): 4480-4491.

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磷石膏对矿渣-水泥胶凝体系固化软黏土力学性能及抗渗性能的影响机制

Influence Mechanism of Phosphogypsum on Mechanical Properties and Impermeability of Soft Clay Solidified with Slag-Cement Cementitious System

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