Durability Study of Cement-Sodium Silicate Double Slurry Grout Consolidation Body under Accelerated Erosion by High Chloride Salts

doi:10.16552/j.cnki.issn1001-1625.2025.0184

Abstract

Abstract: As a grouting material for water plugging and reinforcement, the service performance and degradation mechanism of cement-sodium silicate (C-S) double slurry grout under high chloride salt erosion have not been studied systematically. In this paper, the effects of water-cement ratio (w/c) and water glass concentration on the workability of C-S double slurry grout, the mechanical properties, phase evolution and pore structure of C-S double slurry grout consolidation body (referred to as C-S consolidation body) under high chloride salt curing environment were studied by macroscopic and microscopic tests such as compressive strength, X-ray diffraction (XRD), scanning electron microscope (SEM) and mercury intrusion porosimetry (MIP). The results show that the chemical gelling time of C-S double slurry grout is shortened with the decrease of w/c and water glass concentration in a certain range, and the chemical gelling time is less than 35 s, which meets the demand of rapid water plugging. In the curing environment with chloride concentration greater than 15% (mass fraction), the compressive strength of C-S consolidation body with two optimal mix ratios (w/c of 0.6, water glass concentration of 34°Bé and w/c of 0.7, water glass concentration of 30°Bé) is higher than that of water curing environment before 56 d of curing. In addition, the C-S consolidation bodies of the two optimal mix ratios still show good resistance to chloride salt corrosion after 90 d of curing. Microscopic analysis shows that under high chloride salt concentration, the C-S consolidation body generates Friedel's salt (Fs) in the short-term, and the mechanical properties are improved. However, long-term erosion will lead to decalcification of hydrated calcium silicate (C-S-H) gel and decrease of mechanical properties.

Key words: cement-sodium silicate, double slurry grout, high chloride salt, mechanical property, pore structure, microstructure

CLC Number:

U459.5

WANG Qianqian, DAI Hang, WANG Lichuan, ZHANG Chunyu, LI Liping, WANG Haiyan, ZHANG Jingjing. Durability Study of Cement-Sodium Silicate Double Slurry Grout Consolidation Body under Accelerated Erosion by High Chloride Salts[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3137-3146.

References

[1] SHA F, LI S C, LIU R T, et al. Performance of typical cement suspension-sodium silicate double slurry grout[J]. Construction and Building Materials, 2019, 200: 408-419.
[2] 郑波, 王立川, 吴剑, 等. 铁路高压富水隧道水害的预防与整治对策及其工程应用[Z]. 成都: 中铁西南科学研究院有限公司, 2017.
ZHENG B, WANG L C, WU J, et al. Prevention and remediation measures of water hazards in railway high-pressure water-rich tunnels and their engineering applications[Z]. Chengdu: China Railway Southwest Research Institute Co., Ltd., 2017 (in Chinese).
[3] YU Z, YANG L C, ZHOU S H, et al. Durability of cement-sodium silicate grouts with a high water to binder ratio in marine environments[J]. Construction and Building Materials, 2018, 189: 550-559.
[4] LI S C, LIU B, SUN H F, et al. State of art and trends of advanced geological prediction in tunnel construction[J]. Chinese Journal of Rock Mechanics and Engineering, 2014, 33(6): 1090-1113.
[5] 王星华, 涂鹏. 海底隧道注浆材料试验研究及工程应用[J]. 公路, 2011, 56(11): 210-213.
WANG X H, TU P. A study on experiment of subsea tunnel grouting material and project application[J]. Highway, 2011, 56(11): 210-213 (in Chinese).
[6] 豆海军. 复合水泥基-水玻璃双液注浆材料性能及微观特性研究[D]. 北京: 中国地质大学(北京), 2014.
DOU H J. Investigation on the performance and microscopic characteristics of complex cementitious-sodium silicate two-shot grouting materials[D]. Beijing: China University of Geosciences, 2014 (in Chinese).
[7] 程书凯. 海洋环境多盐作用下水泥基材料劣化机理研究[D]. 武汉: 武汉理工大学, 2019.
CHENG S K. Study on degradation mechanisms of cement-based materials under multiple-salts action in marine environment[D]. Wuhan: Wuhan University of Technology, 2019 (in Chinese).
[8] 刘思作. 盐侵蚀下水泥—水玻璃注浆体的力学性能试验研究[D]. 湘潭: 湖南科技大学, 2016.
LIU S Z. Experimental study on mechanical properties of cement sodium silicate slurry under salt erosion[D]. Xiangtan: Hunan University of Science and Technology, 2016 (in Chinese).
[9] 刘倨任. 水泥—水玻璃浆液性能及化学侵蚀下结石体强度变化[D]. 北京: 中国地质大学(北京), 2018.
LIU J R. Studies on performance of cement-sodium grout and its mechanical properties under salt erosion[D]. Beijing: China University of Geosciences, 2018 (in Chinese).
[10] 李泽良, 颜军. 盐碱地区混凝土工程的耐久性问题[J]. 河南建材, 2013(4): 22-23.
LI Z L, YAN J. Durability of concrete engineering in saline-alkali area[J]. Henan Building Materials, 2013(4): 22-23 (in Chinese).
[11] ZHOU P, LI J Y, JIANG Y F, et al. Damage mechanism of tunnels in the high-content salt rock stratum[J]. Bulletin of Engineering Geology and the Environment, 2021, 80(10): 7633-7652.
[12] 崔佳, 陈俊伟, 夏中升, 等. 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 J, CHEN J W, XIA Z S, et al. 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 (in Chinese).
[13] 刘荻. 波美度对水泥-水玻璃浆液性能的影响[J]. 石家庄铁道大学学报(自然科学版), 2024, 37(3): 113-119.
LIU D. Effect of Baume degree on performance of cement-water glass slurry[J]. Journal of Shijiazhuang Tiedao University (Natural Science Edition), 2024, 37(3): 113-119 (in Chinese).
[14] ZHAO J Y, SUN C C, WANG Q Q, et al. Thermodynamic, mechanical, and electronic properties of ettringite and AFm phases from first-principles calculations[J]. Construction and Building Materials, 2022, 350: 128777.
[15] 王小刚, 史才军, 何富强, 等. 氯离子结合及其对水泥基材料微观结构的影响[J]. 硅酸盐学报, 2013, 41(2): 187-198.
WANG X G, SHI C J, HE F Q, et al. Chloride binding and its effects on microstructure of cement-based materials[J]. Journal of the Chinese Ceramic Society, 2013, 41(2): 187-198 (in Chinese).
[16] 姜旭桐. 盐离子侵蚀下水泥-水玻璃注浆结石体劣化机制研究[D]. 阜新: 辽宁工程技术大学, 2021.
JIANG X T. Research on deterioration mechanism of cement-water glass grouting stone body under salt ion corrosion[D]. Fuxin: Liaoning Technical University, 2021 (in Chinese).
[17] DU C B, SHI K L, YI F, et al. Degradation mechanism of cement-sodium silicate hardened grout bodies under ion erosion[J]. Construction and Building Materials, 2024, 446: 138009.