01697374

Component

This study presents a framework for the prediction of bituminous mixtures’ fracture-related behavior based on the nonlinear viscoelastic cohesive zone (NVCZ) model. The NVCZ model predicts the fracture process from crack nucleation, initiation, and propagation to complete mixture failure. To examine the NVCZ model, two fine aggregate matrix (FAM) mixtures with different fillers were evaluated experimentally and compared to the model’s numerical results. The linear viscoelastic properties were obtained using frequency sweep tests, and NVCZ model parameters were obtained using an experimental-numerical calibration procedure that employed semicircular bending (SCB) tests and finite element numerical simulations. To validate the model, the experimental and numerical simulation results of an indirect tensile (IDT) test were compared. The numerical modeling results agree well with the laboratory testing results. The results of this research suggest that the NVCZ model meets the scientific rigor required for the evaluation of the highly nonlinear and viscoelastic fracture processes of binding constituents in bituminous materials.

This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures.

19-05099

English

4p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; Photos; References

Bituminous mixtures; Calibration; Cracking; Nonlinear equations; Viscoelasticity

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2019 Paper #19-05099

TRIS, TRB, ATRI

Dec 7 2018 9:25AM