激发药剂在矿渣基胶结材料中速凝早强机理试验研究

Experimental study on the mechanism of rapid setting and early strength developmentof activating agents in ore residue-based cementitious materials

以尾砂、矿渣基胶结材料为原材料,研究水玻璃、NaOH、Na_(2)SO_(4)、Al_(2)(SO_(4))_(3) 4种无机盐激发药剂在不同掺量下的速凝早强效果,并解释其早强机理。研究发现:4种激发药剂在一定的添加范围内,充填体试块的抗压强度随龄期的增长而增大。掺量0.5%的NaOH早强效果最好,掺量1.0%的Na_(2)SO_(4)效果次之,掺量0.5%的Al_(2)(SO_(4))_(3)对后期强度增长作用最明显,水玻璃效果最差。同时考虑到实用性、经济性,复合使用Na_(2)SO_(4)和Al_(2)(SO_(4))_(3)添加到尾砂胶结充填体试块中,综合性能较好。研究结果可有效提高充填体早期强度,为矿山进行充填体结构及强度优化设计提供科学参考依据。

This study investigates the early strength development and rapid setting effects of 4 inorganic salt activating agents,namely water glass,NaOH,Na_(2)SO_(4),and Al_(2)(SO_(4))_(3),at different dosages in tailings and ore residue-based cementitious materials,elucidating their mechanisms.Results show that within a certain range of addition,the compressive strength of the filling specimens increases with age for all 4 activating agents.NaOH at a addition of 0.5%exhibits the best early strength development,followed by Na_(2)SO_(4) at 1.0%addition,while Al_(2)(SO_(4))_(3) at 0.5%addition shows the most significant effect on later strength development,with water glass performing the poorest.Considering practicality and economy,the composite use of Na_(2)SO_(4) and Al_(2)(SO_(4))_(3) added to tailings-based cementitious filling specimens demonstrates superior comprehensive performance.These findings effectively enhance the early strength of backfill body,providing scientific references for optimizing the structure and strength of backfill body in mines.