A study on the strength properties of solidified lead contaminated soil under repeated freeze and thaw cycles

Zhong Ping Yang, Deng Hua Li, Shu Lin Liu, Xin Tian, T. C.Jim Yeh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Solidification/stabilization technology has been used extensively to reduce the mobility of heavy metal contaminants and improve the mechanical properties of the soils. Its effectiveness depends on the complex interaction among curing agent, heavy metals, and soil, which could be significantly affected by the external environment. However, the effects of long-term extreme weather conditions including freeze and thaw on the strength of the stabilized lead contaminated soils have not been investigated. This study presents a systematic investigation on the impacts of freeze-thaw (F-T) cycle on the strength properties of stabilized lead contaminated soil. The lead contaminated soil was prepared in the laboratory using a systematic strategy. Several series of tests are conducted including unconfined compression tests (UCTs) and direct shear tests on the soils subjected on the freeze-thaw cycles as well as standard cured conditions (temperature of 20°C and a relative humidity of 95%). The results show that the freeze-thaw cycles have much significant impact on the strength of stabilized lead contaminated soils. After the freeze-thaw cycle tests, the unconfined compression strength, as well as the friction angle and cohesion force, were significant decrease. However, the strength loss ratio of unconfined compression depend on the binder, freeze-thaw cycles times, and extreme temperature of the freeze-thaw cycles. This study provide scientific basis for remediation of heavy metal contaminated site and prevention and treatment of heavy metal pollutant in seasonal freezing area.

Original languageEnglish (US)
Title of host publicationGeotechnical Special Publication
EditorsJianping Hu, Wengang Zhang, Xiong Yu, Hanlong Liu
PublisherAmerican Society of Civil Engineers (ASCE)
Pages270-284
Number of pages15
EditionGSP 304
ISBN (Electronic)9780784482049
DOIs
StatePublished - Jan 1 2019
EventInternational Conference on Geotechnical and Earthquake Engineering 2018: Geotechnical and Seismic Research and Practices for Sustainability, IACGE 2018 - Chongqing, China
Duration: Oct 20 2018Oct 21 2018

Publication series

NameGeotechnical Special Publication
NumberGSP 304
Volume2018-October
ISSN (Print)0895-0563

Other

OtherInternational Conference on Geotechnical and Earthquake Engineering 2018: Geotechnical and Seismic Research and Practices for Sustainability, IACGE 2018
CountryChina
CityChongqing
Period10/20/1810/21/18

Keywords

  • contaminated soil
  • Freeze and thaw cycles
  • heavy metals
  • solidification/stabilization
  • unconfined compressive strength

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Architecture
  • Building and Construction
  • Geotechnical Engineering and Engineering Geology

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  • Cite this

    Yang, Z. P., Li, D. H., Liu, S. L., Tian, X., & Yeh, T. C. J. (2019). A study on the strength properties of solidified lead contaminated soil under repeated freeze and thaw cycles. In J. Hu, W. Zhang, X. Yu, & H. Liu (Eds.), Geotechnical Special Publication (GSP 304 ed., pp. 270-284). (Geotechnical Special Publication; Vol. 2018-October, No. GSP 304). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784482049.027