吉林大学学报(工学版) ›› 2018, Vol. 48 ›› Issue (4): 1045-1054.doi: 10.13229/j.cnki.jdxbgxb20170802

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Micro-morphology and gray entropy analysis of asphalt characteristics functional groups and rheological parameters under freeze-thaw cycles

NIAN Teng-fei, LI Ping, LIN Mei   

  1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
  • Received:2017-08-01 Online:2018-07-01 Published:2018-07-01

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Abstract: In order to better link the chemical analysis with the pavement performance of asphalt binders, improve the durability of asphalt pavement in cold areas, Fourier Transform Infrared Spectroscopy (FTIR) and Dynamic Shear Rheological (DSR) test were used to analyze the changes of asphalt rheological parameters and characteristic functional groups under freeze-thaw cycles. The relationship between the rheological properties and the content of characteristic functional groups of asphalt was discussed based on gray relational entropy analysis model. The microstructure of the asphalt before and after the freeze-thaw cycle was characterized by Scanning Electron Microscopy (SEM). Results show that water-temperature aging reaction occurs in the asphalt during the freeze-thaw cycles. Under different freeze-thaw cycles, the sulfoxide and carbonyl groups in the asphalt FTIR spectrum show a significant increase. The logarithm of asphalt complex modulus has a negative growth relationship with the increase in temperature. The phase angle changes linearly with the temperature. The rutting factor exhibits and exponential decay pattern with temperature. The asphalt chemical compositions influence the rheological properties in the order carbonyl,asymmetric aliphatic,sulfoxide. The asphalt film structure appears obvious folds and flocculent areas after water freeze-thaw cycles.

Key words: road engineering, freeze-thaw cycles, asphalt, characteristic functional group, rheological parameters, gray entropy analysis, micro-morphology

CLC Number: 

  • U414.1
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