Compatibilization Strategy and Mechanism for Co-stabilizing Commingled Plastics and Pyrolyzed Rubber in Asphalt

Ma, Yuetan; Demchuk, Zoriana; Cheng, Guantao; Sorgenfrei, Reese; Zhong, Jingtao; Zhou, Hongyu; Huang, Baoshan

doi:10.1177/03611981241308872

Title: Compatibilization Strategy and Mechanism for Co-stabilizing Commingled Plastics and Pyrolyzed Rubber in Asphalt

Journal Article · Thu Feb 27 00:00:00 UTC 2025 · Transportation Research Record: Journal of the Transportation Research Board

DOI: https://doi.org/10.1177/03611981241308872 · OSTI ID:2997286

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Changsha University of Science and Technology (China)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
The University of Tennessee, Knoxville, TN (United States)

Hot mix asphalt mixture is considered the ideal approach to reuse waste plastics in high-value applications because of its very high amount of usage in highway construction. However, the differences in polarity and density between polymers and asphalt lead to polymer coalescence and therefore the poor storage stability of modified asphalt. These challenges are exalted when recycling commingled plastics. This study introduced an innovative compatibilization strategy and mechanism for co-stabilizing commingled plastics and pyrolyzed rubber in asphalt. Commingled plastics were first grafted with maleic anhydride for surface activation, followed by reactive kneading with pyrolyzed rubber and crosslinking agent to form an integrated thermoplastic elastomer (ITPE) for asphalt modification. The mechanical, thermal, and interfacial behaviors of the ITPE were evaluated through tensile testing, thermogravimetric analysis, and scanning electron microscopy. The storage stability and rheological properties of the modified binder blends were evaluated through the cigar tube test and dynamic shear rheometer testing. Results demonstrated a successful formation of imide bonds in the ITPE, which can improve the strength, ductility, and thermal stability of rubber–plastic composites. Appropriate utilization of crosslinking agents can improve both rutting and fatigue resistance of ITPE-modified asphalt with good storage stability because of the co-existence of rigid plastic and soft rubbery regimes and the formation of a crosslink network. Furthermore, excessive content of crosslinker led to severe phase separation and reduced storage stability of modified binder blends. Extra crosslinker tended to float in asphalt because of its low density and caused an excessive formation of the crosslink network in the top section of the asphalt.

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Research Organization:: The University of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)

Grant/Contract Number:: EE0007897

OSTI ID:: 2997286

Journal Information:: Transportation Research Record: Journal of the Transportation Research Board, Journal Name: Transportation Research Record: Journal of the Transportation Research Board Journal Issue: 5 Vol. 2679; ISSN 2169-4052; ISSN 0361-1981

Publisher:: SAGE PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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