尾矿砂膏体充填材料毛细吸水特性试验研究

采用ISAT法与吸水动力学法测试膏体充填材料的毛细吸水特性与孔结构变化情况,结果表明:增大粉煤灰与水泥用量均能降低膏体充填材料的表层毛细吸水性,且粉煤灰的效果更显著;增大粉煤灰与水泥用量均能降低充填体的平均毛细孔径;水泥用量增加,尾砂充填体的孔径均匀性系数减小,且均匀性系数随粉煤灰掺量的增加先增大后减小;确定粉煤灰最优掺量,适当增大水泥用量,能够优化膏体充填材料的孔结构,保证其耐久性能。

Experimental Study on Capillary water Absorption Properties of Tailings Paste Filling Material

The capillary water absorption properties and pore structures were measured through ISAT and water absorbed kinetics methods, The results showed that: the increase of the amount of fly ash and cement can reduce the superficial capillary water absorption of the paste filling material, and the fly ash has more remarkable effect. The increase of fly ash and cement can reduce the average pore diameter of the paste filling material. The pore uniformity coefficient of the paste material decreases with the increase of the cement dosage, and the pore uniformity coefficient increases first and then decreases with the increase of fly ash content. Determining the optimal dosage of fly ash and increasing the dosage of cement can optimize the pore structure of paste filling material to ensure its durability.