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各有关单位:近年来,我国混凝土材料与工程技术发生了很大变化,混凝土工程结构设计在高度、体积和使用环境等方面逐渐趋于极端化,这种变化对混凝土性能和质量等提出了更高的要求。此外,高效减水剂和矿物掺和料得到普遍使用,因混凝土工程质量问题频发而导致的混凝土供需双方的纠纷也越来越多。与此同时,长期存在的砂石原材料质量问题,有关标准规范
Relevant units: In recent years, great changes have taken place in concrete materials and engineering technology in our country. Concrete structural engineering design has gradually become extremized in terms of height, volume and use environment, and such changes have brought more concrete performance and quality High demand. In addition, superplasticizers and mineral admixtures are commonly used, as the concrete quality problems frequently caused by the dispute between the supply and demand of concrete is also more and more. At the same time, the long-standing quality of gravel raw materials, the relevant standards