Home / Standards / GB/T 15229-2011 GB/T 15229-2011 Active Lightweight aggregate concrete small hollow block 轻集料混凝土小型空心砌块 Standard Type GBT ICS 91.100.30 CCS Q15 Status 现行 Issue Date 2011-12-30 Implementation 2012-08-01 Responsible Dept 中国建筑材料联合会 Drafting Unit 中国建筑材料联合会