1. The Faculty of Printing Packaging Engineering and Digital Media Technology Xi'an University of Technology, Xi'an Shaanxi 710048 P. R. China
2. School of Materials Science and Engineering Xi'an University of Technology, Xi'an Shaanxi 710048 P. R. China
3. Key Laboratory for Special Area Highway Engineering of Ministry of Education Chang'an University Xi'an Shaanxi 710064 P. R. China