水泥固化镉污染土的电阻率及强度试验研究

Study on Electrical Resistivity and Strength Characteristics of Cadmium Contaminated Soil Solidified by Cement

通过对水泥固化镉污染土进行电阻率和无侧限抗压强度试验,揭示了交流电频率对水泥固化镉污染土电阻率的影响,龄期和镉离子含量对水泥土电阻率和强度的影响规律以及电阻率与无侧限抗压强度的关系。结果表明:电阻率随电流频率的增加而明显降低,建议采用50kHz^1MHz的电流测试频率范围;水泥土的强度及电阻率均随龄期的增加呈对数增加;当镉离子质量分数为50mg/kg时,水泥土的强度和电阻率都达到最大值,随着镉离子质量分数的继续增加,强度和电阻率基本保持不变,且普遍高于无镉离子时的水泥土;水泥土强度同电阻率呈现出很好的线性关系。

The electrical resistivity and unconfined compressive strength of cadmium contaminated soil solidified by cement were measured,to reveal the influence of AC frequency on electrical resistivity of the cadmium contaminated soil solidified by cement;the influence law of age and cadmium ion content on resistivity and strength of cement soil,and the relationship between the resistivity and unconfined compressive strength.The results show that,the electrical resistivity decreases significantly with the increase of current frequency,and the range of 50kHz^1MHz is recommended as the current testing frequency range.The compress strength and electrical resistivity of cemented soil increase logarithmically with age.When cadmium content is 50mg/kg,strength and resistivity reach the maximum;As cadmium ion content continues to increase,the resistivity and strength remain unchanged,and generally higher than those of cemented soil without cadmium.Electrical resistivity and strength show a good linear relationship.