Experimental Study on Electrical Resistivity Characteristics of Remodeled Contaminated Q₃ Loess

This study focuses on determining the electrical resistivity under acid and alkali contaminated loess and establishing a correlation between electrical resistivity with water content, composition, and concentration of contamination. Then, acid- and alkali-polluted intact loess were taken as research objects for the experiment of electrical resistivity by using the self-developed voltammetry resistivity test device. Test results show that the influencing characteristics of voltage, water content, pollution composition, and concentration on the resistivity of remolded loess were analyzed. The results reveal the major influence of acid and alkali contamination on the electrical resistivity characteristics of compacted loess. The resistivity of compacted loess decreases with the increase in water content. The resistivity is significantly reduced after being contaminated with hydrochloric acid, nitric acid, and sodium hydroxide. The rate of the decrease reduces with the increase in the concentration of pollutants. After the sulfuric acid pollution, the resistivity test result of the compacted loess sample increases with the increase in pollution concentration. A good correlation can be observed between the resistivity and the pollution degree of the Tongchuan loess used in the experiment, which is helpful for the establishment of an engineering quality evaluation system under the acid- and alkali-contaminated loess.