随着国家基础设施建设步伐的加快,混凝土用砂量也在急剧增加;人们对环境资源的保护意识正在逐步增强,以及部分地区受自然条件限制,天然沙在地区上的分布存在一定的差异,在很多地区资源严重匮乏,成为当前工程质量控制的重要因素之一。在没有天然砂或者短缺的地方,需要因地制宜,就地取材,采用机制砂。 With the accelerating pace of national infrastructure construction, the amount of sand used in concrete is also rapidly increasing. People’s awareness of the protection of environmental resources is gradually increasing. In some areas, due to natural conditions, there are some differences in the distribution of natural sand in the region. Serious lack of resources in many areas, as the current project quality control one of the important factors. In the absence of natural sand or shortage of places, need to local conditions, local materials, the use of mechanical sand.