Structural design of flexural pavements is mainly concerned with determining appropriate layer thickness and composition for the pavement to withstand the traffic and environmental loadings encountered over the design life. Existing fatigue prediction models are mainly empirical based and exhibit deficiency in accounting for various actual pavement situations such as rest periods and temperature fluctuation. They also do not incorporate the fatigue endurance limit (FEL) concept to design a pavement that will not exhibit major structural failure. It is felt that improvements to current fatigue models based on fundamental principles will best integrate with the new mechanistic- empirical (M-E) design procedure. The energy based ratio of dissipated energy change (RDEC) approach has demonstrated that laboratory fatigue life of hot mix asphalt (HMA) materials can be uniquely and fundamentally related to the plateau value (PV) energy parameter. This paper develops a preliminary PV prediction model based on material properties and load response. Being energy based this model can then be modified to take into account the healing effect due to the rest periods between loads. This model can also be applied to estimate the strain level that produces the FEL. Finally suggestions are provided that illustrate how to incorporate a PV prediction model into a flexible pavement design procedure. With appropriate field calibration, an improved energy based fatigue/damage model is expected.
|Number of pages
|Asphalt Paving Technology: Association of Asphalt Paving Technologists-Proceedings of the Technical Sessions
|Published - 2007
|Asphalt Paving Technology 2007 AAPT - San Antonio, TX, United States
Duration: Mar 11 2007 → Mar 14 2007
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering