Academic Journal of Architecture and Geotechnical Engineering, 2024, 6(4); doi: 10.25236/AJAGE.2024.060409.
Yuguo Zhang, Chunhao Zhao, Zilai Zhang, Zhaobin Zhang, Jinshuai Kou, Zhan Jing
Institute of Civil Engineering and Architecture, Zhongyuan University of Technology, Zhengzhou, Henan, 450007, China
In order to solve the problem of high pollution and high cost of traditional lime improved expansive soil, this paper analyzes the feasibility and improvement effect of lime-zeolite powder (L-Z) improved expansive soil. Taking the typical expansive soil in Henan Province as the research object, through a series of physical properties tests, unconfined compressive strength tests (UCS), splitting tensile strength tests (STS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests, the effects of different lime and zeolite powder content on the physical and mechanical properties and curing mechanism of improved expansive soil were discussed. The results show that with the increase of zeolite powder, the optimal moisture content increases and the maximum dry density decreases, the plastic limit increases and the liquid limit and plastic index decrease, and the free expansion rate decreases. After adding lime and zeolite powder, the UCS and STS of the improved soil are significantly improved. When the lime content is 6 % and the zeolite powder content is 12 %, the improvement effect is the best. Zeolite powder reacts with lime to form C-S-H and C-A-H cementitious materials, which cement soil particles to form aggregates and fill pores, increase soil compactness, thus improving soil strength and engineering properties of expansive soil.
expansive soil, lime, zeolite powder, engineering characteristic, curing mechanism
Yuguo Zhang, Chunhao Zhao, Zilai Zhang, Zhaobin Zhang, Jinshuai Kou, Zhan Jing. Study on Engineering Characteristics and Mechanism of Expansive Soil Improved by Lime-zeolite Powder. Academic Journal of Architecture and Geotechnical Engineering (2024) Vol. 6, Issue 4: 54-61. https://doi.org/10.25236/AJAGE.2024.060409.
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