The effect of long-term oxidation on the rheological properties of polymer modified asphalts

• Published in: Fuel (Guildford) Vol. 82; no. 14; pp. 1763 - 1773
• Main Authors: Ruan, Yonghong, Davison, Richard R., Glover, Charles J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.10.2003; Elsevier
• Subjects: Applied sciences; Bitumen. Tars. Bituminous binders and bituminous concretes; Buildings. Public works; Exact sciences and technology; Long-term oxidation; Materials; Plastics; Polymer modified asphalts; Rheological properties; Polymer modified asphalts; Long-term oxidation; Rheological properties; Shear; Ductility; Aging test; Stress strain relation; SBS; Experimental study; Long term; Polymer modified asphalt; Asphalt; Experimental result; Relaxation spectrum; Oxidation; Rheometer; Elongation
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/S0016-2361(03)00144-3

The effect of long-term aging on rheological properties of polymer modified asphalt binders was studied. Modifiers included diblock poly(styrene-b-butadiene) rubber, triblock poly(styrene-b-butadiene-b-styrene), and tire rubber. Asphalt aging was carried out either at 60 °C in a controlled environmental room or at 100 °C in a pressure aging vessel [AASHTO Provisional Standards, 1993]. Both dynamic shear properties and extensional properties were investigated. Polymer modification resulted in increased asphalt complex modulus at high temperatures, decreased asphalt complex modulus at low temperatures, broadened relaxation spectra, and improved ductility. Oxidative aging decreased asphalt temperature susceptibility, damaged the polymer network in binders, further broadened the relaxation spectrum, and diminished polymer effectiveness in improving asphalt ductility.