Abstract
In this paper, the performance of environmentally friendly porous asphalt mixture was optimized by the response surface method. Taking the asphalt-aggregate ratio, crumb-rubber content, and basalt fiber content as the independent variables, the air void, Marshall stability, flow value, Marshall quotient, and Cantabro particle loss are the response values. The best model was determined by fitting the experimental data. After the influence of the independent variables on the response values was clarified, the models were used to optimize the dosage of the asphalt, crumb rubber, and basalt fiber through comprehensive analysis. The results showed that the application of the response surface method can complete the establishment of the models and the optimization of the performance of the porous asphalt mixture with sufficient accuracy. The optimum dosage of the asphalt to aggregate ratio, crumb rubber, and basalt fiber is 4.51%, 11.21%, and 0.42%, respectively. The high-temperature stability, low-temperature crack resistance, water stability, and Cantabro particle loss resistance of the optimized porous asphalt mixture were effectively improved, which provides a reference for the construction of eco-friendly pavement.
Highlights
Porous asphalt mixture (PAM) has been widely studied worldwide due to its superior permeability and noise reduction performance [1,2,3,4]
Jiao et al [14] researched the failure mode of SBS-modified PAM and SBS-crumb-rubber modified PAM by compression and splitting experiments, the results showed that PAM modified by crumb rubber has a more uniform structure and more stable performance
Xie et al [15] studied the pavement performance of crumb rubber-modified PAM in a long-term operation stage and the results showed that the pavement still showed good anti-rutting performance after five years of operation
Summary
Porous asphalt mixture (PAM) has been widely studied worldwide due to its superior permeability and noise reduction performance [1,2,3,4]. Many southern cities in China have adopted the design of permeable asphalt pavement, which has achieved excellent pavement performance and ecological effect in the early stage. In the practical application of permeable pavement, the water stability and the adhesion of aggregate to asphalt of PAM have higher requirements, which limits the application of the porous asphalt mixture to a certain extent [6,7]. In view of this inherent shortcoming of PAM, many scholars have conducted a large number of experimental studies from the perspective of applying modifiers
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