Preparation of an eco-friendly de-icing filler and its effects on the performance of different asphalt mastic

In order to solve the problems of environmental pollution and corrosion of road facilities by chloride ion de-icing agents, eco-friendly acetate de-icing filler for asphalt pavement was prepared in this paper using response surface methodology (RSM). The basic performance of eco-friendly de-icing filler was evaluated by de-icing test, ther-mogravimetry and scanning electron microscope (SEM). Four de-icing asphalt mastic were prepared by eco-friendly de-icing filler with matrix asphalt, SBS asphalt, high viscosity asphalt and asphalt rubber. The rheo-logical and cohesive properties of the four de-icing mastic were analyzed using dynamic shear rheological (DSR) tests and binder bond strength (BBS) test. Fourier Transform infrared spectroscopy (FTIR) and Fluorescence microscope (FM) were used to investigate the microscopic interaction mechanism and compatibility of eco-friendly de-icing filler with the four asphalt. The test results show that eco-friendly de-icing filler is similar to the mineral filler in particle morphology and gradation. The thermal stability, ice melting performance and environmental performance of eco-friendly de-icing filler can satisfy the practical application. The phase angle and rutting factor of de-icing asphalt mastic increased to different degrees, but the adhesion and self-healing properties were weakened. The cohesive strength of matrix asphalt, SBS asphalt, high viscosity asphalt, and asphalt rubber mastic decreased by 4.49%, 6.37%, 14.24% and 10.26% respectively, and the healing rate decreased by 4.17%, 5.32%, 2.78% and 8.41% respectively. New absorption peaks appeared in the FTIR image, indicating that eco-friendly de-icing filler accelerated the aging of asphalt mastic. The FM pictures showed that the high viscosity asphalt was more compatible with eco-friendly de-icing filler and that the asphalt rubber was the worst. The results of this paper show that de-icing asphalt mastic using high viscosity modified asphalt has the best comprehensive performance.