Effect of maleic⁃anhydride⁃grafted polyethylene content on performance of recycled polyethylene⁃modified asphalt

doi:10.19491/j.issn.1001-9278.2022.06.005

Abstract

Abstract:

A type of complex modifier （CM） comprising recycled polyethylene and maleic?anhydride?grafted polyethylene （PE?g?MAH） with concentrations of 0， 1， 3， 5， 7， and 9 wt % was prepared using a twin?screw extruder. The asphalt modified with 4 wt % CM was prepared， and its softening point， needle penetration， ductility， rotational viscosity， high?temperature storage stability， and rheological properties were investigated. The results indicated that the esters compounds were produced through the chemical reaction between the OH groups in asphalt and the MAH groups in CM. The softening point， ductility， viscosity， high?temperature storage stability， and high and low temperature performance were improved significantly with an increase in PE?g?MAH content. However， its needle penetration and phase angle decreased. Therefore， the CM?modified asphalt with a reasonable PE?g?MAH content can be considered as a good candidate for the asphalt pavement construction in regions， especially suitable for use in the zones with a significant change in temperature. In addition， the improvement of high?temperature storage stability was also analyzed.

Key words: asphalt, recycled polyethyene, polyethyene grafted with maleic anhydride, content, property

CLC Number:

TQ325.1⁺2

ZHANG Wencai, HAO Xiaogang, LI Ping, LIN Hao, PEI Qiang, FENG Gongji, FU Zhaohua, YU Xiaofang. Effect of maleic⁃anhydride⁃grafted polyethylene content on performance of recycled polyethylene⁃modified asphalt[J]. China Plastics, 2022, 36(6): 24-31.

Figures/Tables 12

Fig.1. Conventional properties of asphalt modified by CM

Fig.2. Equations of major chemical reactions

Fig.3. Linear fitting of CM modified asphalt viscosity against PE?g?MAH content

Fig.4. FTIR of CM modified asphalt with diffrent PE?g?MAH content

Fig.5. Storage stability of CM modified asphalt was measured by softening point method

Fig.6. SEM morphologies of CM modified asphalt with diffrent PE?g?MAH content

Fig.7. Effect of PE?g?MAH content on complex modulus of CM modified asphalt

Fig.8. Effect of PE?g?MAH content on phase angle of the modified asphalt

Fig.9. Effect of PE?g?MAH content on fatigue parameter of CM modified asphalt

Fig.10. Effect of PE?g?MAH content on rutting parameter of the modified asphalt

Fig.11. Effect of PE?g?MAH content on elastic modulus of CM modified asphalt

Fig.12. S and m?value of asphalt with different PE?g?MAH content

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