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| EFFECT OF CARBONATION ON ELECTRICAL RESISTIVITY OF CEMENT SOLIDIFIED LEAD-CONTAMINATED SOILS |
| ZHANG Dingwen1，2，CAO Zhiguo1，2，ZHANG Tao3，LIU Songyu1，2 |
| (1. Institute of Geotechnical Engineering，Southeast University，Nanjing，Jiangsu 210096，China；2. Jiangsu Key Laboratory of Urban Underground Engineering and Environmental Safety，Southeast University，Nanjing，Jiangsu 210096，China；3. Jiangsu Province Communications Planning and Design Institute Limited Company，Nanjing，Jiangsu 210014，China) |
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Abstract In order to ensure the safety utilization of heavy metal contaminated ground，it is necessary to investigate the effect of carbonation on the performance of cement solidified heavy metal-contaminated soils. Artificial contaminated soils with three different lead contents were solidified using cement，and the electrical resistivity and pH values of the solidified samples before and after carbonation were tested. The carbonation led to an increase of the electrical resistivity of cement solidified lead-contaminated soils，but the electrical resistivity decreased with the increase of lead content，porosity and degree of saturation. A modified Archie?s electrical resistivity model was proposed by replacing the porosity with a parameter which represented the influence of carbonation time，cement content，and lead content on the electrical resistivity of cement solidified lead-contaminated soils. The Archie?s electrical resistivity model was extended to heavy metal contaminated soils. The results also showed that adding lead reduced slightly pH values of the solidified soils，and the pH values of the samples varied from 11–12 to 8–9 after carbonation. There is a nonlinear relationship between the electrical resistivity and the unconfined compression strength of solidified soils.
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Received: 05 September 2014
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2014, Vol. 33 
