Research Article
Study on Water Absorption and Thermal Conductivity of Tunnel Insulation Materials in a Cold Region under Freeze-Thaw Conditions
Table 1
Basic performance indicators of insulation materials.
| | Material types | Thermal conductivity (W/(m·K)) | Density (kg/m3) | Compressive strength (kPa) | Fireproof performance (grade) | Volumetric water absorption (%) | Temperature range (°C) |
| | Polyphenolic | 0.022∼0.035 | 25∼60 | ≥100 | B1 | ≤6.5 | −196∼150 | | Polyurethane | 0.022∼0.030 | 25∼80 | ≥150 | B2 | ≤2 | −50∼100 |
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Note: B1and B2 are the combustion performance grades of thermal insulation materials.
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