Multiscale mechanistic analysis and graded regeneration strategy for aging degradation of high-content rubber-modified asphalt
Source abstract
Abstract
This study investigated the aging degradation mechanisms and regeneration efficiency of high-content rubber-modified asphalt (HCRMA, ≥23% crumb rubber content). The analysis revealed the four-component evolution and functional group responses of asphalt with 20, 25, and 30% rubber content at different aging stages. The blending regeneration effects on macro-micro properties were systematically evaluated for the 30% system. Three key discoveries emerged: (1) Dose-dependent component evolution was observed, where the high-content CR system exhibited more significant asphaltene accumulation post-PAV aging compared to lower-content systems, with the degree of accumulation positively correlated with rubber content. (2) FTIR analysis revealed that thioether oxidation (C-S → S = O) and styrene-butadiene rubber (SBR) crosslinking dominated the aging mechanisms, accompanied by substantial increases in carbonyl index (CI) and sulfoxide index (SI).(3) Blending regeneration achieved excellent viscosity recovery for short-term aging but limited recovery for long-term aging, which was attributed to the accumulation of unswollen particles. Micro-mechanism analysis indicated sulfide stabilization governed short-term regeneration, while ester cleavage was critical for long-term recovery.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Asphalt Pavement Performance Evaluation · Polymer Nanocomposites and Properties · Elasticity and Material Modeling
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Infrastructure Disaster Prevention, Mitigation and Intelligent Evaluation Technology, Hebei University, College of Architecture and Engineering
Tangshan Highway Construction Management Center
Funding
Hebei Province Higher Education Institution Science and Technology Research Project · Hebei Province Department of Transportation Science and Technology Project
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