矿渣基地聚物固化黄土干湿耐久性机理研究

doi:10.16552/j.cnki.issn1001-1625.2024.1541

摘要/Abstract

摘要： 为解决黄土遇水湿陷性强及传统水泥固化剂存在的高碳排放问题,采用水玻璃激发粒化高炉矿渣粉固化黄土。通过无侧限抗压试验、扫描电子显微镜测试和压汞试验,评估地聚物作为环保固化剂替代水泥的可行性。结果表明:最优条件(碱掺量1.5%(质量分数)、养护龄期28 d)下,地聚物固化黄土的抗压强度显著高于水泥固化黄土;地聚物固化黄土和水泥固化黄土的抗压强度随干湿循环次数增加呈先上升后下降的趋势;经干湿循环后,不同固化黄土试样的累积质量损失率均小于20%;不同固化黄土试样的表面裂隙率均随干湿循环次数的增加而升高;在干湿循环作用下,地聚物固化黄土内部因二次聚合反应生成了更多胶凝产物,抗压强度提高。本研究结果可为地聚物固化黄土在实际工程中的应用提供理论参考。

关键词: 岩土工程, 粒化高炉矿渣粉, 水玻璃, 干湿循环, 微观结构

Abstract: In order to solve the problems of high wet subsidence of loess in contact with water and high carbon emission of traditional cement curing agent, sodium silicate excitation granulated blast furnace slag powder was used to cure loess. The feasibility of geopolymer as an environmentally friendly curing agent to replace cement was evaluated by unconfined compressive test, scanning electron microscope and mercury-in-pressure test. The results show that the compressive strength of geopolymer-cured loess is significantly higher than that of cement-cured loess under the optimal conditions (alkali dosing of 1.5% (mass fraction), curing age of 28 d). The compressive strength of geopolymer-cured loess and cement-cured loess tend to increase and then decrease with the number of dry and wet cycles. The cumulative mass loss of the different cured loess samples after the dry and wet cycles is less than 20%. The surface fissure rate of the different cured loess samples increases with the increase in the number of dry and wet cycles. Under the action of dry and wet cycles, the geopolymer-cured loess generates more cementation products due to the secondary polymerization reaction, which improves the compressive strength. The results of this study can provide theoretical reference for the application of geopolymer-cured loess in practical engineering.

Key words: geotechnical engineering, granulated blast furnace slag powder, sodium silicate, dry and wet cycle, microstructure

中图分类号:

TU444

刘敏辉, 刘安龙, 张晓波, 马晓武, 张皓, 贺文昊, 李璐. 矿渣基地聚物固化黄土干湿耐久性机理研究[J]. 硅酸盐通报, 2025, 44(6): 2210-2221.

LIU Minhui, LIU Anlong, ZHANG Xiaobo, MA Xiaowu, ZHANG Hao, HE Wenhao, LI Lu. Mechanism of Dry and Wet Durability of Slag-Based Geopolymer-Cured Loess[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2210-2221.

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