01333308

Component

Bottom-up fatigue cracking is one of the major distresses for asphalt pavements. Accurate prediction of fatigue cracking for asphalt pavement is of paramount importance for a cost-effective pavement design. The fatigue model in the mechanistic empirical pavement design guide (MEPDG) is based on original Asphalt Institute model, with some modifications. However, there are some controversies about the effectiveness of fatigue model in the MEPDG. The major concern exists on the use of dynamic modulus as key parameter and there is no damage property of asphaltic mix to predict fatigue which is induced by damage to the material. This study developed a damage-based phenomenological fatigue model. The pavements at the Federal Highway Administration's accelerated loading facility (ALF) were used to test the effectiveness of existing models, including the MEPDG fatigue model, and validity of the damage-based fatigue model. The data used in this study included dynamic modulus and critical strain energy density of hot mix asphalt (HMA), and tensile strain at bottom of HMA layer and the fatigue life of ALF pavements. It was found that the damage-based model significantly improved the accuracy of the prediction, when compared to the MEPDG fatigue model and other conventional models.

01329018

11-4100

English

18p

2011

Transportation Research Board 90th Annual Meeting

DVD

Figures (12) ; References (9) ; Tables (2)

Asphalt pavements; Fatigue cracking; Hot mix asphalt; Pavement design; Pavement distress; Traffic loads

Mechanistic-Empirical Pavement Design Guide

Accelerated loading facilities

Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Transportation Research Board Annual Meeting 2011 Paper #11-4100

TRIS, TRB

Feb 17 2011 6:45PM