Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio

• DOI: 10.1016/j.heliyon.2022.e10971
• Publication Date: 2022-10-07T03:45:19Z
• Authors: Wang Wen; Lijun Jia; Jun Xie; Wenjing Zhao; Huimin Feng; Dehua Cao; Funan Sun; Pengju Han; Xiaohong Bai; Bin He
• Keywords: H1-99; Science (General); Unconfined compressive strength; 0211 other engineering and technologies; 02 engineering and technology; Social sciences (General); Curing agent; Q1-390; Cu2+-contaminated soil; Electrochemical impedance spectroscopy; Microstructure; Research Article

The main purpose of this work was to study a new method for evaluating the solidification contaminated soil based on electrochemical impedance spectroscopy (EIS). To explore how EIS parameters were affected by pore structure and mesostructure cured system, physical mechanical properties, leaching toxicity, microstructure, stabilized tested after 7, 28, 60, 90 days curing. Based results, equivalent circuit model soil's response established reveal mechanism binder-heavy metal ion-soil interaction. results showed that as red mud (RM)-fly ash (FA) mass ratio curing age increased, strength structural compactness solidified body also increased. best effect achieved with an RM-FA 7:3 days. obtained Rs (Q1 (Rct1W) Q2Rct2). solution resistance Rs, solid-liquid interface ion transfer Rct 1, unconfined compressive (UCS) qu all increasing trend time. Fitting demonstrated both Rct1 closely correlated bodies. These conclusions further verified scanning electron microscope (SEM) experiments. Overall, demonstrates characteristics bodies can be evaluated reveals microscopic Cu2+-contaminated soil.