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膨胀土是一种高塑性、强亲水的黏性土。由于黏土矿物含量较高,膨胀土颗粒的交换阳离子含量也较高,总比表面积较大,在电导率测试指标上反映是膨胀土的导电性随膨胀性的增大而增强。选取强、中、弱3种不同膨胀等级的代表性试样,采用无电极电阻率测定仪和便携式电导率探头,测试了膨胀土泥浆和孔隙水溶液电导率测试,采用原子吸收光谱仪检测了膨胀土孔隙水溶液中的离子种类、含量等。研究表明,膨胀土孔隙水溶液的导电性与膨胀土泥浆的导电性均随膨胀性增大而增大,膨胀土的电导率和自由膨胀率具有良好的线性关系,工程中可以利用这一原理进行膨胀土的快速判别。
Expansive soil is a high plasticity, strong hydrophilic clay. Due to the high clay mineral content, the expansive soil particles also have higher exchange cation content and larger specific surface area. The conductivity test expresses that the conductivity of expansive soil increases with the increase of expansiveness. A representative sample of three different expansion grades was selected. The conductivity of expansive soil slurries and pore aqueous solutions was tested by using electrodeless resistivity testers and portable conductivity probes. The swelling properties of expansive soils Pore water solution of ionic species, content and so on. The results show that the conductivity of swelling pore water solution and the conductivity of swelling soil mud increase with the expansion, and the conductivity and free expansion of the swelling soil have a good linear relationship. This principle can be used in engineering Expansive soil rapid discrimination.