Home / Standards / GB/T 27690-2023 GB/T 27690-2023 Active Silica fume for cement mortar and concrete 砂浆和混凝土用硅灰 Standard Type GBT ICS 91.100.10 CCS Q12 Status 现行 Issue Date 2023-03-17 Implementation 2023-10-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A