In order to study the strength characteristics and hydration mechanism of the cemented ultra-fine tailings backfill (CUTB), the uniaxial compressive strength (UCS) test of CUTB and cemented classified tailings backfill (CCTB) with cement-tailing ratio (C/T ratio) of 1:4 and 1:6 and curing ages of 3d, 7d,14d and 28d were carried out. The hydration products and morphology of the cemented paste backfill (CPB) were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that: the UCS of the CUTB is significantly than the CCTB in the same conditions, the greater C/T ratio and curing age, the greater of UCS difference value. The UCS growth curve of the CUTB is approximately S-shape, and there is a relationship between the UCS and curing age. The ultra-fine tailings particles in the CUTB have potential activity, in the alkaline environment generated cement hydration, active SiO2 and Al2O3 particles undergo secondary hydration reaction, resulting in the CUTB is no or very little Ca(OH)2 crystals be generated, and the hydration products and morphology are also different.

中文翻译：

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胶结超细尾矿充填体强度特性及水化机理试验研究

为研究胶结超细尾矿充填体（CUTB）的强度特性及水化机理，采用水泥尾矿比（C/T比）对CUTB和胶结分级尾矿充填体（CCTB）进行单轴抗压强度（UCS）试验) 1:4 和 1:6，养护龄期分别为 3d、7d、14d 和 28d。通过X射线衍射（XRD）和扫描电子显微镜（SEM）分析了水泥浆回填物（CPB）的水化产物和形貌。结果表明：在相同条件下，CUTB的UCS显着高于CCTB，C/T比和养护龄期越大，UCS差异值越大。CUTB的UCS生长曲线近似S形，UCS与固化年龄有关系。CUTB 中的超细尾矿颗粒具有潜在的活性，