Characteristics of interfacial failure in recycled hot-mix asphalt (HMA) under different design conditions
Source abstract
Abstract
The need to optimise resource-economic outcomes drives high-percentage RAP reuse interest in pavements. Specific failure mechanisms of recycled hot-mix asphalt (HMAs) remain unrevealed. This study investigates recycled HMA failure mechanisms under varying design conditions, correlating macroscopic fracture performance with mesoscopic pull-out interface characteristics. Five groups with different blending durations, RAP aging degrees, and preheating temperatures were evaluated. Results identify four key failure modes: RAP failure, asphalt cohesive failure, asphalt-aggregate adhesion failure, and aggregate fracture failure. Among these, RAP failure is relatively fragile. Although its interface area fraction varies from 7% to 25%, it may foster crack initiation and negatively affect fracture performance. Adjusting blending duration and parameters reduces RAP failure area fraction, enhancing recycled HMA fracture performance. Temperature most significantly influences RAP failure mode. Lower test temperatures markedly increase its area fraction, highlighting higher cracking risk in colder environments.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Asphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Public Health and Nutrition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Zhejiang University of Technology
Zhejiang key Laboratory of Green Construction and Intelligent Operation & Maintenance for Coastal Infrastructure
Jiande Huayu Nano Technology Co., Ltd
Tongji University
Funding
Fundamental Research Funds for the Provincial Universities of Zhejiang · National Natural Science Foundation of China · Zhejiang Provincial Natural Science Foundation of China
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