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Effects of Acidic/Alkaline Contamination on the Physical and Mechanical Properties of Silty Clay

Author

Listed:
  • Yepeng Shan

    (Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing 100044, China
    School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Guoqing Cai

    (Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing 100044, China
    School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Ce Zhang

    (Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing 100044, China
    School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Xiao Wang

    (School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

  • Yehui Shi

    (NO.1 Geological Brigade of Jiangsu Bureau of Geology and Mineral Resources, Nanjing 210041, China
    Tunnel and Underground Engineering Research Center of Jiangsu Province, Nanjing 210041, China)

  • Jian Li

    (Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing 100044, China
    School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)

Abstract

Contaminated soil management and renovation is one of the major environmental geotechnical issues in China. Due to their special strength and stiffness properties, contaminated soil has attracted extensive attention in foundation and slope stability design. For the differentiated influence of acidic/alkaline contamination on the geotechnical physical and mechanical characteristics of soil, this study mainly introduced a remodeled silty clay sample contaminated by acidic and alkaline solutions in the laboratory and conducted research into its basic physical properties, compressive properties, shear strength, and microstructure. It was shown that when the hydrochloric acid concentration increased from 1% to 7%, the density and specific gravity decreased by 7.07% and 3.11%, respectively. The void ratio showed a descending trend with increasing concentration of acid. The acidic solution concentration was negatively correlated with the cohesion of the soil, but the internal friction angle remained constant with a concentration of 1–5%. Alternatively, when the sodium hydroxide concentration increased from 1% to 7%, the density and specific gravity increased by 1.88% and 2.67%, respectively. The void ratio decreased linearly with the increase in consolidation pressure. Alkaline concentration could affect the internal friction angle and cohesion in a positive correlation. Through the observation of microstructure, the surface of acidified soil particles was smooth and flat, while the surface of alkalized soil particles was rough and uneven. The results can provide reference for the evaluation of the mechanical properties of soil contaminated by acid and alkali.

Suggested Citation

  • Yepeng Shan & Guoqing Cai & Ce Zhang & Xiao Wang & Yehui Shi & Jian Li, 2023. "Effects of Acidic/Alkaline Contamination on the Physical and Mechanical Properties of Silty Clay," Sustainability, MDPI, vol. 15(2), pages 1-16, January.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:2:p:1317-:d:1031105
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    References listed on IDEAS

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    1. Shaorui Sun & Wuchao Wang & Jihong Wei & Jinglei Song & Yongxiang Yu & Wei He & Jixing Zhang, 2021. "The physical–mechanical properties degradation mechanism and microstructure response of acid–alkali-contaminated Xiashu loess," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 106(3), pages 2845-2861, April.
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