Effect of addition amount of poly（ethylene terephthalate） waste plastic on performance of asphalt mixture

doi:10.19491/j.issn.1001-9278.2025.08.018

Abstract

Abstract:

This study developed an innovative approach for waste plastic recycling by utilizing poly（ethylene terephthalate）（PET） powders as a modifier in asphalt mixtures through dry mixing. The road performance of PET⁃modified asphalt mixtures was systematically evaluated， including high⁃temperature stability， low⁃temperature crack resistance， and water stability using Marshall stability， rutting， and bending fatigue tests. Results indicated that PET powders significantly enhanced all key performance properties. At an optimal composition of 5.5 wt% PET powders and 1.0 wt% adhesive in mixture， the modified mixture exhibited remarkable improvements： 173.6 % increase in dynamic stability， 20.3 % and 22.9 % enhancement in flexural tensile strength and strain， respectively， along with 16.3 % and 7.9 % improvements in residual stability and strength after water immersion. These findings demonstrate that waste PET powders not only upgrades asphalt performance but also provides an effective solution for sustainable plastic waste utilization in pavement engineering.

Key words: road engineering, asphalt mixture, poly（ethylene terephthalate）, high temperature stability, low temperature crack resistance, water stability

CLC Number:

TQ320.9

SUO Shuwu, SHEN Jiyong, WANG Peng, HAO Gongxin, JING Hongjun, LI Zhigang, LI Haibin. Effect of addition amount of poly（ethylene terephthalate） waste plastic on performance of asphalt mixture[J]. China Plastics, 2025, 39(8): 113-119.

Figures/Tables 12

Fig.1. Appearance of the PET waste plastic powder

Fig.2. Appearance of the adhesive

Fig.3. Preparation process of the PET modified asphalt mixture

Fig.4. Dradation curve of the AC⁃16 PET modified asphalt mixture

Fig.5. Comparison of rutting specimens of the plastic modified asphalt mixture with different PET contents

Fig.6. Results of rutting test of the plastic modified asphalt mixture with different PET contents

Fig.7. Bending tensile failure strength of the plastic modified asphalt mixture with different PET contents

Fig.8. Bending stiffness modulus of the plastic modified asphalt mixture with different PET contents

Fig.9. Bending tensile failure strain of the plastic modified asphalt mixture with different PET contents

Fig.10. Comparison of immersion marshall test specimens of the plastic modified asphalt mixture with different PET contents

Fig.11. Results of immersion marshall test of the plastic modified asphalt mixture with different PET contents

Fig.12. Results of freeze⁃thaw splitting test of the plastic modified asphalt mixture with different PET contents

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