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Mechanical Behavior of Recycled Asphalt Material Under Dynamic Loading Conditions. Final rept.
| 题名： | Mechanical Behavior of Recycled Asphalt Material Under Dynamic Loading Conditions. Final rept. |
| 作者： | DAI, Q.; SADD, M. H.; SHUKLA, A.; TEKALUR, A. |
| 关键词： | *Recycled-materials; *Asphalt-pavements; *Dynamic-behavior.;Microstructure-; Finite-element-models; Numerical-simulation. |
| 摘要： | This report describes activities and findings of a research project dealing with particular micromechanical behaviors of asphalt materials under time dependent loading conditions. The project involved both experimental studies and theoretical/numerical modeling. Experimental work included laboratory testing of compression, indirect tension and three-point bending fracture specimens with 30%reclaimed material (RAP). Testing included both quasi-static and dynamic loadings applied in a split Hopkinson pressure bar apparatus. Results of the experimental studies indicated significant differences in the failure mechanisms of all three types of samples. Much more aggregate failure was observed in samples subjected to dynamic loading conditions. Numerical modeling continued along methods established from our previous studies. This work employed finite element techniques to develop a microstructural model of heterogeneous asphalt materials. The model simulates the load transfer between aggregates and incorporates a damage mechanics approach to simulate the inelastic failure mechanisms in the binder material. The current numerical work has extended our modeling to rate dependent viscoelastic behavior using Schaperys non-linear viscoelastic damage coupled methods. These methods were numerically implemented using the user material subroutines within the ABAQUS commercial FEA code. Model results for several loading histories were in qualitative agreement with expected behavior and for a uniaxial test case, model results compared favorably with some particular experimental data. |
| 报告类型： | 科技报告 |
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