海水侵蚀下复合固化剂改良淤泥质土的物理力学特性研究

doi:10.16552/j.cnki.issn1001-1625.2024.1438

摘要/Abstract

摘要： 采用钢渣粉、粉煤灰固废材料替代部分水泥,以生石灰和NaOH作激发剂组配成新型复合固化剂改良淤泥质土,研究复合固化剂改良后的固化土试样在海水侵蚀作用下的质量变化率、含水量、无侧限抗压强度劣化规律。采用SEM分析海水侵蚀下固化土中土壤颗粒的微观结构变化、胶结物的分布及其与土颗粒之间的相互作用。结果表明:28 d固化土的质量变化率普遍低于7 d固化土的质量变化率,表明淤泥质固化土养护龄期越长,内部结构越稳定;各试样的含水量随海水侵蚀浓度增加呈降低趋势,当复合固化剂掺量为土质量的20%(SLFA-CS-20%)时,固化土试样含水量最低;随着海水中侵蚀性离子浓度增加,固化土强度随侵蚀时间增长而逐渐提高;淤泥质土在复合固化剂作用下可生成大量胶凝材料和钙钒石,从而提高复合固化土的无侧限抗压强度。

关键词: 淤泥质土, 复合固化剂, 质量变化率, 含水量, 无侧限抗压强度, 氯离子浓度

Abstract: Steel slag powder and fly ash solid waste materials were used to replace part of cement, and lime and NaOH were used as activators to form a new composite curing agent to modify mucky soil. The mass change rate, moisture content and unconfined compressive strength of solidified soil samples modified by composite curing agent under seawater erosion were studied. SEM was used to analyze the microstructure changes of soil particles, the distribution of cements and their interaction with soil particles in solidified soil under seawater erosion. The results show that the mass change rate of 28 d solidified soil is generally lower than 7 d solidified soil, which indicates that the longer the curing age of solidified soil is, the more stable the internal structure is. The moisture content of each sample decreases with the increase of seawater erosion concentration. When the content of composite curing agent is 20% (SLFA-CS-20%), the moisture content of solidified soil sample is the lowest. With the increase of the concentration of erosion ions in seawater, the strength of solidified soil gradually increases with the increase of erosion time. Mucky soil can produce a large number of cementitious materials and calcium vanadium stone under the action of composite curing agent, so as to improve the unconfined compressive strength of composite solidified soil.

Key words: mucky soil, composite curing agent, mass change rate, moisture content, unconfined compressive strength, chloride ion concentration

中图分类号:

TU447

吴燕开, 许美玲, 杨椿茂, 王世鑫, 郝润民, 彭亚男. 海水侵蚀下复合固化剂改良淤泥质土的物理力学特性研究[J]. 硅酸盐通报, 2025, 44(4): 1535-1545.

WU Yankai, XU Meiling, YANG Chunmao, WANG Shixin, HAO Runmin, PENG Yanan. Physical and Mechanical Properties of Mucky Soil Modified by Composite Curing Agent under Seawater Erosion[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(4): 1535-1545.

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