Low-Temperature Leachability and Strength Properties of Contaminated Soil with High Moisture Content Stabilized by Novel Phosphate-Based Binder

  • Yasong Feng
  • Yanjun Du
  • Weiwei Ren
  • Weiyi Xia
Conference paper


Although cement-based materials are the most extensively used binders in the solidification/stabilization (S/S) technique, the substantial retardation in the cement hydration by high concentration of heavy metals and low temperature curing condition deteriorate the performances of stabilized soils. A novel binder, KMP, composed of oxalic acid-activated phosphate rock, monopotassium phosphate and reactive magnesia, shows lower leachability for heavy metal and higher strength for the stabilized soils with optimum moisture content. However, the study on low-temperature properties of contaminated soil with high moisture content stabilized by KMP is very limited. The present study validates the low-temperature effectiveness of KMP in S/S techniques by evaluating the strength and heavy metals leached properties of stabilized smelting industrial contaminated soil. A series of tests, including moisture content, dry density, soil pH, leachate electrical conductivity, toxicity characteristic leaching procedure and unconfined compressive strength test are undertaken. Portland cement is selected as a control binder for comparison purposes. The results show that the effect of low-temperature curing condition to the UCS of KMP stabilized soil specimens is lower relative to PC stabilized soil specimens. The KMP stabilized soil specimens with initial moisture content of 25% and cured at −10 °C can fulfill the requirement in USEPA Guidance (≥350 kPa). The effect of low-temperature curing condition to the heavy metals leached concentrations of KMP stabilized soil specimens are lower relative to PC stabilized soil specimens. The KMP stabilized soil specimens with initial moisture content of 35% and cured at −10 °C can fulfill the requirement in China MEP threshold limit. The UCS of stabilized soil decreases with increasing initial moisture content. The UCS of KMP stabilized soil is lower than the PC stabilized soil specimen with high initial moisture content of 35%, while the UCS of KMP stabilized soil is higher than the PC stabilized soil with initial moisture content of 25%.


Solidification/stabilization Low-temperature High moisture content Phosphate-based binder Leachability Strength 



The authors are grateful for the support of Environmental Protection Scientific Research Project of Jiangsu Province (Grant No. 2016031), National High Technology Research and Development Program of China (Grant No. 2013AA06A206), the State Key Program of National Natural Science of China (Grant No. 41330641), National Natural Science Foundation of China (Grant No. 41472258), and Natural Science Foundation of Jiangsu Province (Grant No. BK2012022).


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© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Institute of Geotechnical Engineering, Southeast UniversityNanjingChina

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