Table 2 The cost and effectiveness of the insulation materials
Insulation material | Cost (USD/m3) | Maximum tensile stess in asphalt layer (MPa) | Maximum displacement in asphalt layer (mm) |
|---|---|---|---|
No | N/A | 5.1 | 14.6 mm |
polystyrene | 72–131 | 1.5 | −1.6 |
polyurethane | 100–300 | 1.3 | −1.1 |
glass fiber board | 45–60 | 2.0 | −1.4 |