Dynamic modulus simulation of the asphalt concrete using the X-ray computed tomography images |
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Authors: | Zhanping You Sanjeev Adhikari M Emin Kutay |
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Affiliation: | (1) Department of Civil and Environmental Engineering, Michigan Technological University, Houghton, MI, USA;(2) Bituminous Mixtures Laboratory, SES Group & Assoc., Turner-Fairbank Highway Research Center, Federal Highway Administration (FHWA), McLean, VA, USA |
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Abstract: | The objective of this study is to predict the dynamic modulus of asphalt mixture using both two-dimensional (2D) and three-dimensional
(3D) Distinct Element Method (DEM) generated from the X-ray computed tomography (X-ray CT) images. The 3D internal microstructure
of the asphalt mixtures (i.e., spatial distribution of aggregate, sand mastic and air voids) was obtained using the X-ray
CT. The X-ray CT images provided exact locations of aggregate, sand mastic and air voids to develop 2D and 3D models. An experimental
program was developed with a uniaxial compression test to measure the dynamic modulus of sand mastic and asphalt mixtures
at different temperatures and loading frequencies. In the DEM simulation, the mastic dynamic modulus and aggregate elastic
modulus were used as input parameters to predict the asphalt mixture dynamic modulus. Three replicates of a 3D DEM and six
replicates of a 2D DEM were used in the simulation. The strain response of the asphalt concrete under a compressive load was
monitored, and the dynamic modulus was computed. The moduli of the 3D DEM and 2D DEM were then compared with both the experimental
measurements results. It was revealed that the 3D discrete element models successfully predicted the asphalt mixture dynamic
modulus over a range of temperatures and loading frequencies. It was found that 2D discrete element models under predicted
the asphalt mixture dynamic modulus. |
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Keywords: | X-ray computed tomography Dynamic modulus Asphalt concrete Distinct element Microstructure Micromechanics Two-dimensional Three-dimensional |
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