ABSTRACT
The master curves of complex shear modulus and phase angle of asphalt binder provide its important rheological information. Although many studies have been performed to develop prediction models of , the determination methods often focus on fitting them with experimental data of the modulus. The intrinsic relationships between , , relaxation spectrum and relaxation modulus are seldom considered. Consequently, defects of the fitting arise naturally, due to overfitting issues from experimental errors and underfitting issues from bias in the approximation/empirical models. The mismatched master curves of , and often lead to inconsistent deduced from storage modulus and loss modulus , and also inaccurate calculated from the resultant . This study proposes a new method to determine the master curves of and , which uses a joint optimisation to simultaneously minimise errors between the data and the models of and , together with the differences between ’s obtained from and as a penalty of the loss function. Two asphalt binders are used to assess the newly developed method and existing ones. Cross-validation based on stress-relaxation test indicates that the new method is more robust and accurate.
Disclosure statement
No potential conflict of interest was reported by the author(s).