Home / Standards / GB/T 4508-2025 GB/T 4508-2025 Active Test method for ductility of asphalt 沥青延度测定法 Standard Type GBT ICS 75.140 CCS E43 Status 现行 Issue Date 2025-10-05 Implementation 2026-05-01 Responsible Dept 国家标准委 Drafting Unit N/A