T/GXDSL 069-2025 Lunar base construction material testing specifications

Scope

Main Technical Content: This standard specifies the performance testing methods, quality evaluation systems, and certification requirements for construction materials of lunar bases, applicable to the R&D, production, and acceptance of various construction materials needed for the construction of China's manned lunar bases within the next decade. The standard covers three categories of lunar construction materials: in-situ sintered lunar soil materials (with lunar soil accounting for ≥80% of the raw material, sintering temperature range of 800-1200℃, and compressive strength ≥20MPa); prefabricated lightweight materials on Earth (with a transport mass ratio ≤0.4, i.e., the launch mass of construction materials on Earth ≤400kg per cubic meter, and assembly accuracy on orbit ±2mm); and novel functional composite materials (with radiation shielding rate ≥90% against 1MeV high-energy protons, and thermal conductivity ≤0.5W/(m·K)). The standard specifies strict test conditions to simulate the extreme environment of the lunar surface: ultra-high vacuum (≤1×10?3 Pa, equivalent to one trillionth of Earth's atmospheric pressure), large temperature cycling (–173℃ to 127℃, each cycle 30 minutes), strong solar radiation (AM0 spectrum, intensity 1368±10W/m2 without atmospheric attenuation), and lunar dust erosion environment (simulating lunar dust concentration of 100-200mg/m3, mainly composed of SiO? 45±2%, Al?O? 15±1%, and FeO 10±0.5%). Test items include basic physical properties (density 1.2-2.8g/cm3, porosity 15-30%), mechanical properties (compressive strength ≥20MPa, flexural strength ≥10MPa, fracture toughness KIC ≥1MPa·m1/2), thermal-physical properties (linear expansion coefficient 0.5-8.0×10?/℃, specific heat 0.5-1.5J/(g·K)), radiation resistance (performance degradation ≤15% after cumulative exposure to 100Gy γ-rays and 10?/cm2 proton irradiation), and long-term durability (passing 1,000 temperature cycles and 500 hours of lunar dust erosion testing). The sta

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