The stress-strain properties of the cement stabilized/solidified chromium contaminated soils eroded by sodium chloride

Abstract

The groundwater always rich in corrosive ions such as sulfate and chloride in coastal or industry developed regions. Exposing to the corrosive groundwater environment could cause the secondary contamination of the cement solidified/stabilized heavy metal contaminated soils. Corrosive ions may change the deformation behaviors of the solidified soils by binding into the cement binders. To investigate the stress-strain properties of the cement stabilized/solidified chromium contaminated soils that had been soaked in the sodium chloride solution, a series of triaxial stress-strain tests were performed. The results showed that the stress-strain curve of the specimens included three phases: 1Elastic deformation;2Plastic yield deformation ;3failure-deformation. Both the failure stress and failure strain increased with the confining pressure increased. The presence of corrosive caused the failure stress decrease and the slope of the stress-strain curve in failure-deformation stage decline. Compared with the short-time soaking specimens, the failure stress increased and the failure strain decreased of the long-time soaking specimens. Generally, the stress-strain curves of the specimens presented strain softening, and belonged to brittle failure.