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各有关单位和专家:根据国标委综合[2014]89号文《国家标准委关于下达2014年第二批国家标准制修订计划的通知》,GB23439-2009《混凝土膨胀剂》已列入修订计划,项目编号:20141793-Q-609。该标准由中国建筑材料科学研究总院负责组织有关生产企业、质检机构等参加起草,现已完成征求意见稿。
Relevant units and experts: According to [2014] No.89 of the State Standardization Administration of the People’s Republic of China on “Notice of the National Standardization Commission on Issuance of the Second Batch of National Standards Revisions in 2014”, GB23439-2009 “Concrete Expansion Agent” has been included in the revised plan, Project Number: 20141793-Q-609. The standard by the China Building Materials Science Research Institute is responsible for organizing the production enterprises, quality inspection agencies to participate in the drafting, has now completed the draft.