Dynamic mechanical properties of SBR modified asphalt

F. Gavhari, I. L. Al-Qadi

Research output: Contribution to conferencePaperpeer-review


Dynamic mechanical properties of six styrene-butadiene rubber (SBR) latex modified asphalt binders were investigated. A viscosity graded AC-20 asphalt cement, along with two SBR modifiers were used in the study. Concentration level of polymers ranged from 2 to 5 percent by weight of asphalt cement. Effect of short term aging was simulated by Rolling Thin Film Oven Test (RTFOT) procedure. Frequency sweeps were performed at temperatures ranging from 5 to 75°C. Time-temperature superposition principle was used to construct the master curves of the absolute value of complex modulus and loss tangent over several decades of reduced frequency. It was found that at high temperatures, addition of polymer could increase the complex modulus. This effect was more pronounced at lower frequencies. Within the range of polymer concentration levels studied, the increasing polymer contents appeared to have little effect on rate of change in complex modulus of RTFOT residue. Evaluation of the loss tangent master curves indicated that polymer modification can impart a considerable level of elasticity to the binder. In all cases studied, the measured shift factors fitted the WLF equation with universal constants.

Original languageEnglish (US)
Number of pages11
StatePublished - 1996
Externally publishedYes
EventProceedings of the 1996 4th Materials Engineering Conference. Part 1 (of 2) - Washington, DC, USA
Duration: Nov 10 1996Nov 14 1996


OtherProceedings of the 1996 4th Materials Engineering Conference. Part 1 (of 2)
CityWashington, DC, USA

ASJC Scopus subject areas

  • Building and Construction


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