玻化微珠砂浆搅拌过程中骨料分布均匀性研究

Research on Aggregate Distribution of Glazed Hollow Bead Mortar during the Mixing Process

为定量研究玻化微珠砂浆在搅拌过程中骨料分布均匀性受搅拌条件的影响,对新拌玻化微珠砂浆中的骨料进行分离,并根据分离得到的骨料与砂浆质量占比,定义了评价新拌砂浆中骨料分布均匀性的均匀度指数。试验结果表明:新拌砂浆中骨料分布均匀性随搅拌时间的延长呈先优化后劣化的变化趋势,搅拌过程中存在最优均匀度;卧式与立式搅拌机均在搅拌至4 min时达到最佳均匀度,卧式搅拌机的新拌砂浆中骨料分布均匀度优于立式搅拌机;玻化微珠骨料参与搅拌的时间相同时,采用先搅拌后投入玻化微珠骨料的方式能够优化骨料分布的均匀性。更高的搅拌机转速能更快提升新拌玻化微珠砂浆均匀度,但是较低的搅拌机转速下拌和的新拌玻化微珠砂浆极限均匀度更优,达到极限的耗时更长。

In order to quantitatively study the uniformity of aggregate distribution during the stirring process of glazed hollow bead mortar, the aggregate of the fresh glazed hollow bead mortar was separated. According to the mass ratio of aggregate and mortar obtained by separation, the uniformity index for evaluating the uniformity of aggregate distribution in fresh mortar is defined. The test results show that the uniformity of aggregate distribution in fresh mortar is firstly optimized and then deteriorated with the extension of stirring time, and the optimum uniformity exists during the mixing process. Both horizontal and vertical mixers achieve optimum uniformity when stirred for 4 minutes. The uniformity of aggregate distribution in the new mortar of the horizontal mixer is better than that of the vertical mixer;when the glazed hollow bead aggregates participate in the same stirring time, the uniformity of aggregate distribution can be optimized by first mixing and then feeding into vitrified microbead aggregates. Higher mixer speeds can increase the uniformity of fresh glazed hollow bead mortar faster, but the fresh glazed hollow bead mortar blended at lower mixer speeds has better uniformity and longer time to limit.