A two level factorial experimental design for evaluation of viscoelastic properties of bitumens containing a surfactant warm additive
Digital Object Identifier (DOI): dx.doi.org/10.14311/EE.2016.013
In this paper, a two level factorial experimental design was developed to evaluate the effects of a surfactant warm additive and test temperature on the elastic and viscous properties of bitumen under unaged, short-term aged and long-term aged conditions. These rheological properties were measured by the dynamic shear rheometer (DSR) under fixed strains oscillatory loading at high and intermediate temperatures. The results showed that additive content and test temperature are significant factors influencing prediction of loss modulus and storage modulus of selected bitumen at various ageing conditions, but interaction effect of additive content and temperature is not significant factor on the prediction of loss modulus in unaged and long-term ageing conditions. Using higher amount of this additive decreases both loss and storage modulus in various ageing conditions, while increasing the test temperatures result in lower values for loss and storage modulus.
Additives, Ageing, Rheology, Testing, Warm Asphalt Mixture