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各有关单位:根据国家标准化管理委员会下达的计划编号为20067431-Q-609《混凝土膨胀剂》国家标准制定项目,由中国建筑材料工业协会主管,全国水泥制品标准化技术委员会归口管理,中国建筑材料科学研究总院负责起草。
Relevant units: According to the National Standardization Project No. 20067431-Q-609 “Concrete Expanders” issued by the State Standardization Management Committee under the supervision of China Building Materials Industry Association, the National Cement Standardization Technical Committee under the jurisdiction of China National Building Materials Science Research Institute responsible for the drafting.