TPU/Nano-ZnO复合改性沥青的性能研究及微观机制

doi:10.11896/cldb.23050071

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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.

Key words： TPU nano-ZnO composite modified asphalt macro-performance micro-mechanism

Published: 25 August 2024 Online: 2024-09-10

CLC number:

U414

Fund:National Natural Science Foundation of China (51978086,52278438),the Postgraduate Scientific Research Innovation Project of Hunan Province (CX20210750),the Science and Technology Project of Hebei Province Transport Department (JX-202012).

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	Articles by authors
	TIAN Xiaoge
	LI Guangyao
	CHEN Gong
	YAO Shilin
	HUANG Xuemei
	WANG Junjie
	LU Jinzhou

Cite this article:

TIAN Xiaoge,LI Guangyao,CHEN Gong, et al. Study on Performance and Micro-mechanism of TPU/Nano-ZnO Composite Modified Asphalt[J]. Materials Reports, 2024, 38(16): 23050071-10.

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http://www.mater-rep.com/EN/10.11896/cldb.23050071 OR http://www.mater-rep.com/EN/Y2024/V38/I16/23050071

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