Highlights Viscosity of asphalt rubber is affected by the liquid phase and the particle effect. Particle effect dominates the viscosity under some crumb rubber contents. Viscosity of liquid phase is more reliable asphalt mixture workability parameter.
Abstract Previous studies have documented the disconnect between the rotational viscosity of asphalt rubber (AR) and the workability of AR mix. There is a possibility that the particle effect of crumb rubber modifier (CRM) particles within AR causes this phenomenon. This study measured the viscosities of ARs and the corresponding liquid phases at three temperatures. The workability of the corresponding AR mixes was evaluated using the number of gyrations of Superpave Gyratory Compactor (SGC) samples. The changes on AR caused by the CRM contents were measured using Gel permeation chromatography (GPC) test. The experimental results revealed that the rotational viscosity of the AR liquid phase is more suitable to be used as a workability indicator. In addition, thresholds of CRM content were reported. Once the threshold is exceeded, the increase in AR viscosity is only caused by the increase in CRM particle effect and there is no detectable CRM/asphalt interaction.
Workability of rubberized asphalt from a perspective of particle effect
2021-01-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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