Open AccessEstimating the viscoelastic properties of local hot-mix asphalt
Author(s) -
Mohammed Zuhair Mohamedmeki
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/671/1/012100
Subject(s) - viscoelasticity , asphalt , dynamic modulus , asphalt pavement , creep , shear modulus , modulus , materials science , shear (geology) , phase angle (astronomy) , material properties , structural engineering , geotechnical engineering , composite material , engineering , dynamic mechanical analysis , physics , astronomy , polymer
The mechanistic empirical method for designing flexible pavement requires determination of the strain that results from applying wheel load. To achieve this, the viscoelastic properties of asphalt concrete is required to be characterised numerically in order to permit simulating such asphalt concrete in finite element modelling for layered systems of flexible pavement. Accordingly, the estimation of the viscoelastic properties of local hot mix asphalt (HMA) was the target of this study. This was achieved using the interconversion process, with the master curve of shear modulus estimated from the master curves of dynamic modulus and phase angle developed within the Hirsch model by substituting the binder dynamic and volumetric properties of local Hot-Mix Asphalt (HMA) into the model. The master curve of shear modulus was constructed with aid of the interconversion process from the creep compliance resulting from Indirect Tensile Tests (ITT) under different testing conditions. The calculated master curve of shear modulus was then used to validate the estimated results. The validation revealed that the estimation method offered good ability to determine the properties required. Numeric values, known as the Prony series, used to characterise asphaltic pavement layers numerically, were established by fitting the normalised master curve of shear modulus. The research results showed that this estimation method is an appropriate way to determine the viscoelastic properties of HMA as opposed to using costly and complex laboratory tests.