李晓光，陈 婷，卢 攀
李晓光，陈 婷，卢 攀
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.