机制砂颗粒表面粗糙,颗粒级配差,粗颗粒和细粉所占的比例较高,这些弊端大大制约了机制砂在预拌砂浆中的应用。根据实际生产的要求,将机制砂进行筛分分级,粒径1.18~3.5 mm为一级,粒径1.18mm以下为一级,然后再按照一定的比例搭配使用,完全可以配制出性能良好的预拌砂浆。 The surface roughness of sand particles, grading of particles is poor, and the proportion of coarse particles and fine particles is high. These drawbacks greatly restrict the application of sand in ready-mixed mortar. According to the actual production requirements, the classification of the mechanism of sand screening, particle size 1.18 ~ 3.5 mm for the first, the particle size of 1.18mm following a level, and then with a certain proportion with the use of fully prepared out of good performance of the pre- Mixing mortar.