Experimental Study on the Synorgistic Solidification of High-Concentration Copper Contaminated Soil by Industrial Waste Residues and Cement

Abstract

In this paper, high-concentration copper contaminated soil was solidified by cement and industrial waste residues including red mud, carbide slag, and phosphogypsum. Through unconfined compressive strength test, toxic characteristic leaching procedure test, and electrical resistivity test, the effects of mixing ratio and content of curing agent, and curing time on the solidification were investigated. The results show that the three kinds of industrial waste residues well solidify high-concentration copper contaminated soil, when used synergistically with cement. When the ratio of cement∶red mud∶carbide slag∶phosphogypsum is 6.5∶1∶1.5∶1, the solidification effect is the best. Moreover, increasing the amount of curing agent significantly increase, the strength of contaminated soil. With the optimum mixing ratio, the strength increases by 3.1 times as the content of curing agent increases from 10% to 20%. There is a very high positive correlation between the strength and resistivity.

Keywords

• copper contaminated soil
• red mud
• carbide slag
• phosphogypsum
• solidification