Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity

Nong, Xingzhong; Liang, Yuehua; Lin, Shan; Lu, Yi; Shang, Zhi

doi:10.3390/su142113901

Open AccessArticle

Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity

by

Xingzhong Nong

¹,

Yuehua Liang

¹,

Shan Lin

¹,

Yi Lu

² and

Zhi Shang

^3,*

¹

Guangzhou Metro Design & Research Institute Co., Ltd., Guangzhou 510010, China

²

School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

³

Civil Engineering Discipline, La Trobe University, Melbourne, VIC 3086, Australia

^*

Author to whom correspondence should be addressed.

Sustainability 2022, 14(21), 13901; https://doi.org/10.3390/su142113901

Submission received: 10 October 2022 / Revised: 21 October 2022 / Accepted: 24 October 2022 / Published: 26 October 2022

(This article belongs to the Special Issue Analysis and Modeling for Sustainable Geotechnical Engineering)

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Abstract

The purpose of this study is to investigate the hydro-mechanical properties of heavy metal (Cu, Zn) contaminated soil stabilized using cement treatment situated under different salinity. Conventional oedometers with cylindrical samples dimensioned ⌀61.8 × 20 mm were used to conduct the tests. Two cement contents (10%, 20% by mass of cement to the mass of dry soil) and three salinity levels (0.5M, 1M, 1.5M) were used as comparison variables. The compression results demonstrate that the coupled condition in terms of mechanical and chemical will have different behavior on the soil specimen, as Cc (compression index) changes with different metal fractions. The hydraulic conductivity (k) results show that a higher metal fraction will compromise the k. The possible development of water and metal ions is proposed that when a different type and fraction of metal ions are present, the hydration reaction can be suppressed depending on whether the metal ion prioritizes the reaction with either cement or saline solution. It was found that Cu ions prioritize their reaction to a saline solution while Zn ions target the Ca(OH)₂ that is available from cement. However, more studies should be carried out to confirm this point.

Keywords: contaminated soil; stabilization/solidification; cement; compressibility; salinity

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MDPI and ACS Style

Nong, X.; Liang, Y.; Lin, S.; Lu, Y.; Shang, Z. Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity. Sustainability 2022, 14, 13901. https://doi.org/10.3390/su142113901

AMA Style

Nong X, Liang Y, Lin S, Lu Y, Shang Z. Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity. Sustainability. 2022; 14(21):13901. https://doi.org/10.3390/su142113901

Chicago/Turabian Style

Nong, Xingzhong, Yuehua Liang, Shan Lin, Yi Lu, and Zhi Shang. 2022. "Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity" Sustainability 14, no. 21: 13901. https://doi.org/10.3390/su142113901

APA Style

Nong, X., Liang, Y., Lin, S., Lu, Y., & Shang, Z. (2022). Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity. Sustainability, 14(21), 13901. https://doi.org/10.3390/su142113901

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

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Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity

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