01373733

Component

A critical need for asphalt concrete mixtures is the development of performance tests which can accurately and efficiently assess a mixtures’ resistance to fatigue cracking. This need is especially evident as state agencies consider allowing high reclaimed asphalt pavement (RAP) mix designs which tend to be more brittle and susceptible to cracking. Seven mixtures from the 2006 National Center for Asphalt Technology (NCAT) Pavement Test Track high RAP study were evaluated using bending beam fatigue (BBFT) testing, simplified visco-elastic continuum damage (S-VECD) modeling, and overlay tester (OT) results at two joint opening displacements to assess each mixture’s ability to resist fatigue cracking. The S-VECD modeling was performed through data collected from dynamic modulus and controlled crosshead (CX) displacement fatigue testing in an Asphalt Mixture Performance Tester (AMPT). The introduction of RAP into asphalt mixtures decreased the overall fatigue life of the mixes at specified strain thresholds in three of the four testing methodologies. The overlay tester results using the smaller joint opening displacement showed 20% RAP mixtures to be the most fatigue resistant. The BBFT test results correlated well to all three testing methodologies, while a strong statistical correlation between the BBFT test results and S-VECD modeling predictions gives confidence in the ability to use the AMPT device as a fatigue prediction tool.

This paper was sponsored by TRB committee AFK30 Characteristics of Nonasphalt Components of Asphalt Paving Mixtures

01362476

12-4140

English

31p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References; Tables

Asphalt concrete pavements; Durability; Dynamic modulus of elasticity; Flexibility; Laboratory tests; Performance tests; Polymer asphalt; Test tracks

Pavements

Transportation Research Board Annual Meeting 2012 Paper #12-4140

TRIS, TRB

Feb 8 2012 5:22PM