编号：CDUT-2023-33

标题：Mechanical properties, microstructure and consolidation of sand modified with sodium silicate

入藏号：WOS:000874810900004

中国科学院文献情报中心期刊分区：地球科学1区/TOP（2022）

本校作者：徐一天，张岩*，黄俊杰，陈国庆

来源出版物：ENGINEERING GEOLOGY  卷: 310  文献号: 106875

出版年：2022

第一地址：成都理工大学

关键词：Sodium silicate;Grouting;Solidification;Mechanical properties;Microstructure

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摘要：Grouting is an effective way to address the poor performance of sandy soils. There are few studies on water glass single-liquid permeation grouting for solidifying sandy soils. To study the effects and processes of water-glass-cured sandy soil, we conducted a direct shear test and uniaxial compressive strength test on water-glass-cemented sandy soil specimens and summarized the relationships among modulus, Baume degree, curing time and strength of cured sandy soil from a macroscopic mechanical point of view. By combining nuclear magnetic resonance (NMR) imagery and scanning electron microscopy (SEM), the consolidation evolution of cured sandy soil was revealed from a microscopic point of view, including the pore structure and gel state. The results showed that there is a saturation value for the strength of water-glass-cured sandy soil. The specimens with a low Baume degree solidified quickly, the strength saturation value was lower than 3 MPa, and the inner layer was dehy-drated in a loose sand state; the specimens with a high Baume degree solidified slowly, and the strength satu-ration value was higher than 8 MPa. The migration of water glass and the deepening of curing are the two processes that control the effect of consolidation. The state of the silica gel plays a decisive role in the strength, the saturation value of the specimen strength depends on the limit of gel condensation, and the thickness of the gel layer is exponentially related to the strength. In addition, high-modulus and high-Baume degree water glass is recommended for consolidation when an improvement in the strength and compactness of sandy soils is needed.

文章链接地址:https://www.sciencedirect.com/science/article/pii/S001379522200360X?via%3Dihub