Research on the low temperature resistance and crack resistance properties of nano modified matrix asphalt
In order to improve the crack resistance of asphalt at low temperature,three silane coupling agents,namely octyltrimethoxysilane,phenyltrimethoxysilane,and ADP-S473,were used to modify the surface of nano SiO2.The modified nanoparticles were used to modify the matrix asphalt.Through the evaluation of the basic proper-ties and low-temperature resistance of asphalt,the improvement effect of various nano materials on the matrix as-phalt was analyzed,and the improvement of low temperature crack resistance and stability of the mixture was evalu-ated and tested.The results showed that the nano-SiO2(SI-1 and SI-3)modified with ADP-S473(amine silane coupling agent)and octyltrimethoxysilane had a better effect on the low temperature resistance of matrix asphalt,and the optimal SiO2 dosage was 2.5% .The low-temperature flexural tensile strength of the mixture improved by two types of nano asphalt was both above 10 MPa,and the maximum flexural tensile strain at the bottom of the beam was more than 2 600 μɛ,the freeze-thaw splitting tensile strength reached over 1 MPa,among which the nano SiO2 modi-fied with ADP-S473 had the best effect.
surface modificationnano modified asphaltmixtureslow temperature crack resistance
万方数据
维普
