Influence of Polyphosphoric Acid (PPA) on Properties of Crumb Rubber (CR) Modified Asphalt

Crumb rubber (CR) modified asphalt always presents very poor storage stability. In addition, CR modified asphalt is often prepared with a large amount of CR powders to obtain superior performance, but this modification results in increased instability. In this context, the use of polyphosphoric acid (PPA) was proposed to alleviate these issues. The influences of PPA content and asphalt composition on the properties of CR modified asphalt and its microstructure were studied by conventional test, rheological test, thermal storage test and attenuated total reflection Fourier transform infrared spectrometer (ATR-FTIR) characterization. It was found that the rheological behaviors of CR modified asphalt were improved by adding PPA. PPA also improved the storage stability by increasing the viscosity of CR modified asphalt at the storage temperature. Moreover, asphalt composition also has an influence on the properties. High asphaltenes content increases the rutting resistance and low temperature cracking resistance but reduces the fatigue resistance, while high resins content helps increase the storage stability. ATR-FTIR characterization results demonstrated that PPA/CR modification is both a chemical and a physical process. The adsorption peak area ratio (PAR) value derived from ATR-FTIR can indicate the degree of PPA/CR modification from the microscopic perspective. The relationship between the PAR value and PPA content helps determine the acid concentration of modified asphalt. In conclusion, PPA/CR modification is very promising for its potential in improving the storage stability and the rheological behaviors of CR modified asphalt.

• Record URL:
  https://doi.org/10.1016/j.conbuildmat.2019.117094
• Record URL:
  http://www.sciencedirect.com/science/article/pii/S095006181932536X
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/09500618
• Supplemental Notes:
  • © 2019 Elsevier Ltd. All rights reserved. Abstract reprinted with permission of Elsevier.
• Authors:
  • Qian, Chengduo
  • Fan, Weiyu
  • Ren, Fangyong
  • Lv, Xiaobo
  • Xing, Baodong
• Publication Date: 2019-12-10

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: 117094
• Serial:
  • Construction and Building Materials
  • Volume: 227
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0950-0618
  • Serial URL: http://www.sciencedirect.com/science/journal/09500618?sdc=1

Subject/Index Terms

• TRT Terms: Asphalt additives; Asphalt mixtures; Chemical stability; Crumb rubber; Microstructure; Phosphoric acid; Rheological properties
• Subject Areas: Highways; Materials; Pavements;

Filing Info

• Accession Number: 01722347
• Record Type: Publication
• Files: TRIS
• Created Date: Nov 14 2019 9:32AM