Wetting-drying effect on the strength and microstructure of cement-phosphogypsum stabilized soils

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外文摘要：Phosphogypsum has often been used as an effective and environmentally friendly binder for partial replacement of cement,improving the engineering properties of slurries with high water content.However,the influence of phosphogypsum on the physicomechnical properties of stabilized soil sub-jected to wetting-drying cycles is not well understood to date.In this study,the effect of phospho-gypsum on the durability of stabilized soil was studied by conducting a series of laboratory experiments,illustrating the changes in mass loss,pH value and unconfined compressive strength(qu)with wetting-drying cycles.The test results showed that the presence of phosphogypsum significantly restrained the mass loss in the early stage(lower than the 4th cycle),which in turn led to a higher qu of stabilized soil than that without phosphogypsum.After the 4th cycle,a sudden increase in mass loss was observed for stabilized soil with phosphogypsum,resulting in a significant drop in qu to a value lower than those without phosphogypsum at the 6th cycle.In addition,the qu of stabilized soils correlated well with the measured soil pH irrespective of phosphogypsum content for all wetting-drying tests.According to the microstructure observation via scanning electron microscope(SEM)and X-ray diffraction(XRD)tests,the mechanisms relating the sudden loss of qu for the stabilized soils with phosphogypsum after the 4th wetting-drying cycle are summarized as follows:(i)the disappearance of ettringite weakening the cementation bonding effect,(ii)the generation of a larger extent of microcrack,and(iii)a lower pH value,in comparison with the stabilized soil without phosphogypsum.

外文关键词：

Wetting-dryingPhosphogypsumMicrostructureDurability

作者：

Lingling Zeng、Xia Bian、Jiaxing Weng、Tao Zhang

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作者单位：

College of Civil Engineering,Zhejiang University of Technology,Hanzhou,310014,China

Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai University,Nanjing,210098,China

State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,221116,China

Jiangsu Water Source Company Ltd.of the Eastern Route of the South-to-North Water Diversion Project,Nanjing,210000,China

Power China Zhongnan Engineering Corporation Limited,Changsha,410027,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Openend Research Fund of State Key Laboratory for Geomechanics and Deep Underground Engin

项目编号：

5217832852178361SKLGDUEK2114

出版年：

2024

DOI：

10.1016/j.jrmge.2023.06.022

岩石力学与岩土工程学报(英文版)

中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD

影响因子：0.404

ISSN：1674-7755

年,卷(期)：2024.16(3)

参考文献量35