Home / Standards / GB/T 23439-2017 GB/T 23439-2017 Active Expansive agents for concrete 混凝土膨胀剂 Standard Type GBT ICS 91.100.30 CCS Q12 Status 现行 Issue Date 2017-12-29 Implementation 2018-11-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A