川东地区蕴藏着大量的细度模数在1.5以下的特细砂。为了在基本建设中贯彻“因地制宜,就地取材”的原则,因此,大量使用特细砂,有它极其重要的经济价值。起初,由于我们对特细砂的性能掌握不够,在用特细砂水泥砂浆抹地面面层中出现了一些问题,如起砂、麻面、脱皮、龟裂、起鼓等现象。后来经过反复实践和试验,掌握了它的 The east of Sichuan Province contains a large amount of extra fine sand with a fineness modulus of 1.5 or less. In order to implement the principle of “appropriate measures for local conditions and local materials” in the capital construction, the use of extra fine sand in large quantities has its extremely important economic value. Initially, due to the insufficient grasp of the properties of ultra-fine sand, there were some problems in the use of super-fine sand cement mortar to wipe the floor surface, such as sanding, matting, peeling, cracking, and drumming. Later, after repeated practice and experimentation, he mastered it.