https://orcid.org/0000-0001-8354-4617
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ABSTRACT
Clarifying the evolution of in-service asphalt pavement aging is critical to the project-level strategy decision of pavement maintenance. However, the environmental-induced differences in field aging evolution are still unclear. To address this problem, this research aims to first characterise field aging in terms of both chemistry and rheology, and then to investigate the factors controlling the aging gradient of asphalt pavement from both the environment and the mixture itself. Field cores were collected from 14 sections of 10 highways with different in-service times, climatic conditions, and mixture types. Field-aged binder was extracted from wearing course with different depths. Laboratory-aged binder after different cycles of Pressure Aging Vessel (PAV) were also evaluated as a benchmark for field-aged binders. The rheological and chemical properties of both the field-based and lab-based aged binders were measured using dynamic shear rheometer (DSR) and Fourier transform infrared (FTIR) spectrometer, respectively. Moreover, the mortar film thickness index (Tm) of mixture from 4 sections was characterised through image processing techniques. The changing rate of the pavement in 0–2 cm characterised by carbonyl index was closely correlated with environmental factors. Higher solar radiation, lower annual days >30°C, and thicker mortar film thickness lead to a greater aging gradient.
Disclosure statement
No potential conflict of interest was reported by the author(s).