STUDY ON STRENGTH AND STRESS-STRAIN CHARACTERISTICS OF CLAY SOLIDIFIED BY CCR-GGBFS

Industrial waste calcium carbide residue (CCR) and ground granulated blast furnace slag (GGBFS) are used to solidify and improve clay. According to the unconfined compressive strength (UCS) test, the mass ratio of carbide slag to GGBFS, the influence of moisture content and the content of curing agent on the strength of solidified soil are studied. The characteristics of stress-strain curve and the change rule of failure strain are analyzed. The test results show that the hydration activity of GGBFS can be effectively activated by carbide slag, and the optimal ratio of carbide slag and GGBFS is 2:3. The UCS of solidified clay increases first and then decreases with the increase of the content of the curing agent and moisture content. The stress-strain curve of solidified soil can be divided into compaction stage, elastic deformation stage and failure stage. With the increase of UCS, the failure strain of solidified soil decreases as a power function while the deformation modulus increases linearly with the increase of UCS, and decreases as a power function with the increase of failure strain. Used separately, the failure of carbide slag or GGBS solidified soil is plastic failure, and the failure strain increases with the increase of moisture content. However, the composite solidified soil is brittle failure, and its failure strain decreases with the increase of moisture content. The toughness index of solidified soil decreases with the increase of the content of curing agent.