TY - GEN
T1 - A study on the strength properties of solidified lead contaminated soil under repeated freeze and thaw cycles
AU - Yang, Zhong Ping
AU - Li, Deng Hua
AU - Liu, Shu Lin
AU - Tian, Xin
AU - Yeh, T. C.Jim
N1 - Funding Information:
This research was funded by the National Natural Science Foundation of P.R.China (No. 41772306). The authors thank the reviewers for their valuable suggestions for improving the paper. Special thanks to Prof. Yeh Tian-chi Jim (The University of Arizona, USA) for his valuable suggestions during the study and language editing.
Publisher Copyright:
© 2019 American Society of Civil Engineers.
PY - 2019
Y1 - 2019
N2 - 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.
AB - 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.
KW - Freeze and thaw cycles
KW - contaminated soil
KW - heavy metals
KW - solidification/stabilization
KW - unconfined compressive strength
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U2 - 10.1061/9780784482049.027
DO - 10.1061/9780784482049.027
M3 - Conference contribution
AN - SCOPUS:85060239839
T3 - Geotechnical Special Publication
SP - 270
EP - 284
BT - Geotechnical Special Publication
A2 - Hu, Jianping
A2 - Zhang, Wengang
A2 - Yu, Xiong
A2 - Liu, Hanlong
PB - American Society of Civil Engineers (ASCE)
T2 - International Conference on Geotechnical and Earthquake Engineering 2018: Geotechnical and Seismic Research and Practices for Sustainability, IACGE 2018
Y2 - 20 October 2018 through 21 October 2018
ER -