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由国家建筑材料工业局提出的国家产品标准《建筑用砂》GB/T14684-93及《建筑用卵石、碎石》GB/T14685-93,均已由国家技术监督局于1993年10月27日的批准,并规定于1994年7月1日起实施。在这以前,建设部已批准了由中国建筑科学研究院主编的工程建设行业标准《普通混凝土用砂质量标准及检验方法》JGJ52-92及《普通混凝土用碎石或卵石质量标准及检
The national product standard “Construction sand” GB / T14684-93 and “Pebble and stone for construction” GB / T14685-93 put forward by the State Bureau of Building Materials Industry have been approved by the State Bureau of Technical Supervision on October 27, 1993 Of the approval, and the provisions of July 1, 1994 come into operation. Prior to this, the Ministry of Construction has approved the engineering construction industry standard “Sand Quality Standard for Ordinary Concrete and Inspection Method” JGJ52-92 compiled by China Academy of Building Research and "Ordinary concrete with gravel or pebble quality standards and inspection