China Plastics ›› 2022, Vol. 36 ›› Issue (12): 78-85.DOI: 10.19491/j.issn.1001-9278.2022.12.012

• Processing and Application • Previous Articles     Next Articles

Study on preparation technology of rubber⁃plastic alloy modified asphalt

LI Ningli(), WANG Meng, WANG Rui, ZHU Zhuangzhuang   

  1. School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China
  • Received:2022-08-22 Online:2022-12-26 Published:2022-12-20

Abstract:

To utilize waste rubber powders and waste plastics reasonably and effectively and also improve their compatibility with asphalt, two type of waste materials were melt blended in advance using a precision mixer to prepare three types of rubber/plastic alloy modifiers with mass ratios of rubber to plastic of 5∶5 (Type I), 6∶4 (Type II) and 7∶3 (Type III). According to the orthogonal test scheme for the Trent 70 # asphalt matrix modification, the rubber/plastic alloy⁃modified asphalt was prepared. The optimal formulation was determined through the 48⁃h segregation softening point of the rubber/plastic alloy⁃modified asphalt, penetration at 20 ℃, softening point, and ductility index at 5 ℃. The optimal key preparation technology and processing parameters were determined by means of the grey correlation analysis and extreme⁃difference analysis methods. The results indicated that the optimal blending scheme was determined to use the rubber/plastic alloy with a mass ratio of rubber to plastic of 7∶3 (Type III), 2 wt % solvent increasing (furfural extraction oil), and 9 wt % stabilizer (sulfur). The rubber/plastic alloy⁃modified asphalt exhibited good storage and high temperature stabilities. The optimal key processing parameters were determined to be a shear temperature of 180 ℃, a shear rate of 3 500 r/min, a shear time of 1.5 h, and a development time of 0.5 h. Finally, the structural morphology, rheological properties, low temperature crack resistance, and fatigue resistance of rubber/plastic alloy⁃modified asphalt were analyzed by means of scanning electron microscope, Brookfield rotate viscosity tester, BBR tester, and DSR tester. The results indicated that the rubber/plastic alloy modifiers exhibited good compatibility with asphalt, and the prepared rubber/plastic alloy⁃modified asphalt exhibited lower temperature sensitivity, better low⁃temperature crack resistance, and higher fatigue resistance.

Key words: road engineering, preparation technology, grey relational analysis, range analysis, rubber?plastic alloy modified asphalt, storage stability

CLC Number: