Abstract: To promote the application of polymer/nano-modified asphalt in durable pavement,the composite modified asphalt was prepared by adding different dosage of TPU and nano-ZnO to A-70# matrix asphalt in the laboratory.The physical properties and rheological properties were studied by traditional physical properties test,dynamic shear rheological test (DSR) and bending beam rheological test (BBR).The optimal dosage of the two modifiers was determined based on the response surface method.The microscopic modification mechanism was discussed by Fourier infrared spectroscopy (FTIR).The anti-ultraviolet aging ability of the modified asphalt was analyzed by using high-pressure ultraviolet mercury lamp environment box.The significance of the aging performance test index was evaluated based on principal component analysis.The results show that the high temperature stability and low temperature cracking resistance of the matrix asphalt can be improved by the joint action of TPU and nano-ZnO,and the optimal dosage of the two modifiers is 5% and 3%,respectively.According to the results of FTIR,there are both physical blending and chemical addition reaction in the modification process of composite modified asphalt.The addition of TPU and nano-ZnO can inhibit the formation of polar groups such as carbonyl and sulfoxide groups in the ultraviolet aging process of asphalt.The complex shear modulus,carbonyl index,stiffness modulus and sulfoxide index have the most significant influence on the ultraviolet aging properties of asphalt.
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2024, Vol. 38 
