摘   要：为研究铁尾矿颗粒形貌对砂浆尺寸稳定性的影响，利用光学显微镜观察了铁尾矿砂、天然河砂和普通机制砂的颗粒形貌并对其进行了定量描述，探索量化指标对砂浆尺寸稳定性的影响规律。试验结果表明，三种细骨料中，铁尾矿砂的针片状、非球形程度最高，其颗粒表面光滑但存在最多的尖锐棱角。在干燥环境下，细骨料较低的OR值和RK值将显著增加砂浆试件的收缩值。由于铁尾矿砂这两个指标最低，其砂浆试件的尺寸稳定性低于天然河砂和普通机制砂砂浆试件。不同粒级的铁尾矿砂所配制的砂浆试件尺寸稳定性试验证明，此时影响砂浆尺寸稳定性主要因素不是颗粒形貌，而是粒级范围，粒级范围越小，则铁尾矿砂浆试件的尺寸收缩越大。

Abstract: The influence of particle morphology for iron ore tailing on dimension stability of mortar was studied, particle morphology for iron tailings sand(IOT), nature river sand(NS) and manufactured sand(MS) was observed by optical microscope, influence rules of quantitative description and indicators on stability of mortar dimension is carried out. The results show that, The results show that IOT sand is flakiness, has greater degree of irregular shape and smoother surface, which exists the most sharper edges and corners in three kinds of fine aggregates. Under dry environment, lower OR value and RK value for fine aggregates will be increased obviously through shrinkage value. Dimension stability of mortar specimens is lower than that of NS specimens and MS specimens, because of lowest OR value and RK value. Experiment of  dimension stability for mortar specimens is proved by prepared IOT with different grain size, the main effecting factors of dimension stability of mortar is grain rang, not particle morphology, demensional shrinkage of IOT mortar specimens becomes greater with smaller grain range.