A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of polyphosphoric acid (PPA) on properties of crumb rubber (CR) modified asphalt
Graphical abstract Display Omitted
Highlights Rheological behaviors of CR modified asphalt are enhanced by addition of PPA. PPA improves the stability of CR modified asphalt during thermal storage process. Asphalt composition affects the rheological behaviors and storage stability. PPA/CR modification mechanism is revealed. PAR value derived from ATR-FTIR can be the indicator of PPA/CR modification.
Abstract 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.
Influence of polyphosphoric acid (PPA) on properties of crumb rubber (CR) modified asphalt
Graphical abstract Display Omitted
Highlights Rheological behaviors of CR modified asphalt are enhanced by addition of PPA. PPA improves the stability of CR modified asphalt during thermal storage process. Asphalt composition affects the rheological behaviors and storage stability. PPA/CR modification mechanism is revealed. PAR value derived from ATR-FTIR can be the indicator of PPA/CR modification.
Abstract 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.
Influence of polyphosphoric acid (PPA) on properties of crumb rubber (CR) modified asphalt
Qian, Chengduo (author) / Fan, Weiyu (author) / Ren, Fangyong (author) / Lv, Xiaobo (author) / Xing, Baodong (author)
2019-09-26
Article (Journal)
Electronic Resource
English
Experimental Research on Crumb Rubber and Polyphosphoric Acid Composite Modified Asphalt Binders
| Trans Tech Publications | 2012
Experimental Research on Crumb Rubber and Polyphosphoric Acid Composite Modified Asphalt Binders
| British Library Conference Proceedings | 2012