Home / Standards / GB/T 23439-2009 GB/T 23439-2009 Abolished Expansive agents for concrete 混凝土膨胀剂 Standard Type GBT ICS 91.100.30 CCS Q12 Status 废止 Issue Date 2009-03-25 Implementation 2010-03-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A