A novel micromechanical-analogical model for low temperature creep properties of asphalt binder and mixture

作者：Falchetto Augusto Cannone; Moon Ki Hoon^*

来源：Canadian Journal of Civil Engineering, 2015, 42(12): 1019-1031.

DOI：10.1139/cjce-2014-0485

• low temperature creep properties
• Hirsch model
• ENPTE transformation
• asphalt mixture microstructure
• MCF model

The ENTPE (Ecole Nationale des Travaux Publics de I'Etat) transformation is commonly used to predict the low temperature properties of asphalt binders from the corresponding mixtures experimental data and vice- versa. Nevertheless, the transformation parameter, alpha, associated to the ENTPE equation, cannot be directly obtained without relying on both binder and mixture testing. This paper presents a comprehensive investigation to link the ENTPE transformation to the mixture microstructure. This is accomplished by three-point bending tests on asphalt binders and mixtures, digital image processing and statistical evaluation of mixture microstructure, together with a newly proposed micromechanical- analogical model, called MCF ( Moon - Cannone Falchetto), used for deriving an explicit expression of alpha. The values of alpha obtained from asphalt binder and mixture laboratory measurement are compared to the values predicted by the new formulation. The results indicate that reasonable predictions of low temperature creep stiffness of asphalt binder can be obtained when the new expression of alpha is used in the ENTPE transformation.

• 出版日期2015-12