Understanding the low temperature properties of Terminal Blend hybrid asphalt through chemical and thermal analysis methods. (30th April 2018)

• Record Type: Journal Article
• Authors: Lin, Peng; Huang, Weidong; Tang, Naipeng; Xiao, Feipeng; Li, Yi
• Is Part Of: Construction & building materials. Volume 169(2018)
• Page Start: 543
• Page End: 552
• Publication Date: 2018-04-30
• Subjects: Terminal Blend hybrid asphalt binder -- Aliphatic component -- Glass transition temperature -- Components distribution -- Crumb rubber modifier; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2018.02.060
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Low temperature properties of Terminal Blend(TB) hybrid asphalt are compared with SBS modified asphalt both in binder andmixture. Components distribution of TB hybrid asphalt binder is presented. During the degradation of crumb rubber, aliphatic component is released which has shorter average chains lengthcompared with that in base binder. Increasing amount of aliphatic component leads to a decrease of Tg and improvement in low temperature properties. Relaxation property is improved with increase of short chains length aliphatic component. Abstract: Terminal Blend (TB) hybrid asphalt binders are composed of crumb rubber, SBS polymer and polyphosphoric acid (PPA). Understanding the relationship between the chemical composition and low temperature properties has a guiding significance for asphalt modification. In this study, BBR (Bending Beam Rheometer) test, GPC (Gel Permeation Chromatography) test, FTIR (Fourier Transform Infrared) test and DSC (Differential Scanning Calorimetry) test were used to evaluate the rheological and chemical properties of TB hybrid binder and TSRST (Thermal Stress Restrained Specimen test) was conducted to estimate the low temperature properties of mixture. The results indicated that crumb rubber and SBS improved low temperature properties, while PPA had an adverse effect. Furthermore, during the degradation of crumb rubber, aliphatic component was released, which played an important role in improving low temperature properties. Finally, TB hybrid asphalt mixture also had better low temperature properties than SBS modified asphalt mixtures according to TSRST results.