Research Article
Effect of Gamma-Irradiated Recycled Low-Density Polyethylene on the High- and Low-Temperature Properties of Bitumen
Table 2
Characteristic properties of base and γ-LDPER modified bitumens before and after short-term ageing.
| | Properties | Binder types | | Modified Bitumens | | Base | 1-γ-LDPER | 3-γ-LDPER | 5-γ-LDPER | 7-γ-LDPER | 9-γ-LDPER |
| | Penetration (25°C; 0.1 mm) | 195.5 | 168.8 |
135 | 102 | 83.1 | 57.2 | | Softening point (°C) | 38.7 | 42.5 | 48.4 | 64.2 | 60.3 | 70.5 | | Ductility (cm) at 25°C | 103 | 92 | 84 | 77 | 69 | 63 | | Penetration index (PI) | −0.73 | 0.23 | 1.31 | 1.85 | 2.54 | 3.28 |
| | After ageing | | Change of mass (%) | 0.76 | 0.68 | 0.65 | 0.40 | 0.37 | 0.35 | | Penetration (25°C; 0.1 mm) | 102 | 85.6 | 125 | 93.8 | 76.5 | 52.5 | | Retained penetration (%) | 52 | 50.7 | 92.5 | 91.9 | 92 | 92 | | Softening point (°C) | 42.7 | 45.3 | 49.5 | 65.1 | 61.1 | 66.5 | | Change in softening point (°C) | 4 | 2.8 | 1.1 | 0.9 | 0.8 | −4 |
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