Mechanical experiment and microstructural characteristics of water glass solidified loess

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-10-15 DOI:10.1007/s10064-024-03932-2

Shaoqiang Guo, Huimei Zhang, Yuzhang Bi, Jiafan Zhang

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Abstract

In order to explore the influence of water glass on the strength and microscopic mechanism of loess, water glass with different content and Baume degree was used to solidify loess. Unconfined compressive strenght test, particle analysis tests, mercury intrusion tests and SEM tests were carried out to qualitatively and quantitatively analyze the strength characteristics and microstructure changes of loess and water glass solidified loess under different conditions. The results showed that the unconfined compressive strength of water glass solidified loess increased with the increase of the water glass content, the Baume degree and the curing period. After 28 days of curing, the unconfined compressive strength reached the maximum value when the Baume degree of water glass was 52 Be’ and the content was about 20%. The incorporation of water glass gradually increased the cements attached to the loess skeleton particles and their surfaces. The particle diameter increased and the macropores were filled with cements. The macropores in the soil gradually decreased and the integrity was enhanced. The reason for the increase in the strength of water glass solidified loess was that the cementing material generated by the hydration reaction of water glass enhanced the degree of cementation between soil particles and increased the mutual friction between particles, which made the soil structure more stable and improved the soil strength. The research results provide a reference for the selection of relevant parameters in the design of improved loess engineering.

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水玻璃固化黄土的力学实验和微观结构特征

为了探讨水玻璃对黄土强度的影响及其微观机理，采用不同含量和波美度的水玻璃对黄土进行固结。通过无侧限抗压强度试验、颗粒分析试验、汞侵入试验和扫描电镜试验，定性和定量分析了不同条件下黄土和水玻璃凝固黄土的强度特征和微观结构变化。结果表明，水玻璃固化黄土的无压抗压强度随水玻璃含量、波美度和固化时间的增加而增加。固化 28 天后，当水玻璃的波美度为 52 Be'、含量约为 20% 时，无压抗压强度达到最大值。水玻璃的加入逐渐增加了附着在黄土骨架颗粒及其表面的水泥。颗粒直径增大，大孔隙被水泥填充。土壤中的大孔隙逐渐减少，整体性增强。水玻璃固结黄土强度提高的原因是水玻璃水化反应产生的胶结物增强了土颗粒间的胶结程度，增大了颗粒间的相互摩擦力，使土体结构更加稳定，提高了土体强度。研究结果为改良黄土工程设计中相关参数的选择提供了参考。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.