| Summary: | In order to investigate the influence of Linglong cementitious material on the consolidation of tailings under different conditions,a series of backfill blocks at different ratios,different densities and different curing ages are designed with ordinary Portland cement control and their uniaxial compressive strength is measured through strength test.Then the phase composition and the micro-morphology of the tailings backfill are discussed by such measuring and testing techniques as XRD and SEM.The results show that the hydration reaction of the cementitious material produces ettringite and C-S-H gel,and promotes the consolidation of the tailings backfill;the age and the ratio of cementitious material to tailings will affect the development of the content and morphology of ettringite and C-S-H gel in the hydration products,and the content of hydration products will increase with the increase of age and the ratio of cementitious material to tailings.The content of the products increases and overlaps to form a dense network structure,which is macroscopically expressed as an increase in strength;the mass concentration affects the pores in the test block,thereby affecting the strength.
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