Abstract
Ceramic fiber (CF) is a novel thermally resistant material with the potential to improve the high-temperature performance of asphalt mixture. In this study, asphalt mixtures with 0%, 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% CFs were prepared. The Marshall test, wheel tracking test, Marshall immersion test, freeze-thaw splitting test, and low-temperature bending test were conducted to evaluate the performance of the CF-modified asphalt mixture. The morphologies of these asphalt mixtures were observed using scanning electron microscopy to analyze the modification mechanism. The results showed that the CFs could improve the mechanical properties, high-temperature stability, moisture susceptibility, and low-temperature cracking resistance of asphalt mixture, with the optimum CF content being 0.4%. Further microscopic analysis showed that the CFs improved the performances of asphalt mixture through forming three-dimensional network structure, asphalt absorption, bridging cracks, and pulling-out effect.
Highlights
Asphalt mixture is the most widely used material for pavement construction
The performances of Ceramic fiber (CF)-modified asphalt mixtures were evaluated. e following conclusions can be drawn based on the findings of this study: (1) e addition of CFs can substantially improve the rut resistance and mechanical properties of asphalt mixtures
Compared with asphalt mixtures without CFs, the dynamic stability, Marshall stability, and indirect tensile strength (ITS) increased by 27.3%, 17.5%, and 20.0%, respectively
Summary
Asphalt mixture is the most widely used material for pavement construction. The asphalt pavements are prone to deformation under the combined effects of heavy loads and high temperatures. Water-related damages such pothole formation, loosening, and stripping often occur in humid areas, reducing the service life of asphalt pavements [1, 2]. Current reinforcing methods for asphalt mixtures include incorporating additives such as polymers and fibers [3,4,5]. High costs and complex preparation processes limit the utilization of polymeric reinforcing. Owing to their excellent reinforcement effects and convenient preparation processes, fibers have attracted considerable attention as additives to asphalt mixtures [6, 7]
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