- 李曉光，陳 婷，盧 攀
引用本文摘 要：為研究鐵尾礦顆粒形貌對砂漿尺寸穩定性的影響，利用光學顯微鏡觀察了鐵尾礦砂、天然河砂和普通機制砂的顆粒形貌并對其進行了定量描述，探索量化指標對砂漿尺寸穩定性的影響規律。試驗結果表明，三種細骨料中，鐵尾礦砂的針片狀、非球形程度最高，其顆粒表面光滑但存在最多的尖銳棱角。在干燥環境下，細骨料較低的OR值和RK值將顯著增加砂漿試件的收縮值。由于鐵尾礦砂這兩個指標最低，其砂漿試件的尺寸穩定性低于天然河砂和普通機制砂砂漿試件。不同粒級的鐵尾礦砂所配制的砂漿試件尺寸穩定性試驗證明，此時影響砂漿尺寸穩定性主要因素不是顆粒形貌，而是粒級范圍，粒級范圍越小，則鐵尾礦砂漿試件的尺寸收縮越大。 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.