水溶蚀作用下水泥-水玻璃双液浆力学性能衰减机理研究

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3470-3478.

水溶蚀作用下水泥-水玻璃双液浆力学性能衰减机理研究

崔佳¹, 陈俊伟², 夏中升^3,4, 沙建芳^3,4, 刘建忠^3,4, 韩方玉^3,4, 郭飞^3,4

1.江苏省交通工程建设局,南京 210004;
2.中铁第四勘察设计院集团有限公司,武汉 430063;
3.江苏苏博特新材料股份有限公司,南京 211103;
4.高性能土木工程材料国家重点实验室,南京 211103

收稿日期:2023-06-08 修订日期:2023-07-26 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 夏中升,工程师。E-mail:xiazhongsheng@cnjsjk.cn
作者简介:崔佳(1977—),男,高级工程师。主要从事盾构隧道、高速公路的施工技术研究工作。E-mail:15039606@qq.com
基金资助:
国家自然科学基金面上项目(51978318);国家自然科学基金青年科学基金(52008191)

Mechanical Property Attenuation Mechanism of Cement-Sodium Silicate Double Liquid Slurry under Water Corrosion

CUI Jia¹, CHEN Junwei², XIA Zhongsheng^3,4, SHA Jianfang^3,4, LIU Jianzhong^3,4, HAN Fangyu^3,4, GUO Fei^3,4

1. Jiangsu Transportation Engineering Construction Bureau, Nanjing 210004, China;
2. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, China;
3. Jiangsu Sobute New Materials Co., Ltd., Nanjing 211103, China;
4. State Key Laboratory of High Performance Civil Engineering Materials, Nanjing 211103, China

Received:2023-06-08 Revised:2023-07-26 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 双液浆在富水环境中长期服役极易受到水溶蚀作用而力学性能大幅衰减。本文研究了配合比参数、养护制度对双液浆力学性能的影响,并结合多种微观分析手段,揭示了富水环境下双液浆性能衰减的作用机制。结果表明:10%、15%(质量分数)低含水率砂层中养护有利于早期强度发展,但后期强度逐渐衰减,而25%(质量分数)高含水率砂层中试块早期强度相比15%(质量分数)含水率砂层中试块降低了23.5%,但后期水溶蚀作用被大幅削弱,220 d抗压强度较90 d增加了15%;标准养护条件加速双液浆力学性能的劣化,试块强度分别较水中养护、绝湿养护降低了80.6%和91.0%;双液浆力学性能发展主要受水化反应及水溶蚀作用控制,早期阶段由水化反应主导,后期阶段由水溶蚀作用主导,力学性能的演变本质是两种效应相互叠加的结果;在富水环境中长期养护,基体外侧水化产物不断向外迁移溶出,在试块外层形成多孔结构包覆层,并成为内部结构中钠、硅酸根离子及水化产物的迁移通道,导致力学性能持续劣化。

关键词: 盾构隧道, 同步注浆, 水泥-水玻璃, 双液浆, 水溶蚀, 水化产物

Abstract: After long-term service in rich water environment, the mechanical properties of double liquid slurry are easily degraded by water corrosion. The variation law of the mechanical property attenuation of cement-sodium silicate double liquid slurry under the mixing ratio parameters and curing system was studied. Combined with various microscopic analysis methods, the mechanism of the mechanical property attenuation of cement-sodium silicate double liquid slurry under rich water environment was analyzed from the aspects of mineral composition and microstructure evolution. The results show that, curing in the low water content sand layer of 10%, 15% (mass fraction) are beneficial to the early strength development, but the strength gradually decreases in the later stage. The early strength of the test block in the 25% (mass fraction) high water content sand layer decreases by 23.5% compared to the 15% (mass fraction) water content sand layer, but the water corrosion effect is significantly weakened in the later stage, and the compressive strength at 220 d increases by 15% compared to 90 d. The standard curing conditions accelerate the deterioration of the mechanical properties of double liquid slurry, and the strength of the test block is 80.6% and 91.0% lower than that of water curing and sealed curing, respectively. The development of the mechanical properties is mainly controlled by hydration reaction and water corrosion. In the early stage, hydration reaction dominates, and in the later stage, water corrosion dominates. The development of the mechanical properties is essentially the effect of superposition of the two effects. The double liquid slurry material system is maintained in the rich water environment for a long time, and the hydration products on the outside of the matrix are constantly migrating and dissolving out. The outer layer of the test block forms a porous structure coating layer with a certain thickness, and becomes a migration channel for sodium ions, silicate ions and hydration products in the internal structure, which leads to continuous deterioration of the mechanical properties of the matrix.

Key words: shield tunneling, simultaneous grouting, cement-sodium silicate, double liquid slurry, water corrosion, hydration product

中图分类号:

TU528

崔佳, 陈俊伟, 夏中升, 沙建芳, 刘建忠, 韩方玉, 郭飞. 水溶蚀作用下水泥-水玻璃双液浆力学性能衰减机理研究[J]. 硅酸盐通报, 2023, 42(10): 3470-3478.

CUI Jia, CHEN Junwei, XIA Zhongsheng, SHA Jianfang, LIU Jianzhong, HAN Fangyu, GUO Fei. Mechanical Property Attenuation Mechanism of Cement-Sodium Silicate Double Liquid Slurry under Water Corrosion[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3470-3478.

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