SEDL / STP / STP561-EB / STP32178S

Dynamic Response and Fatigue Characteristics of Asphaltic Mixtures

Saraf, CL
Research associate and professor, Ohio State University, Columbus, Ohio

Majidzadeh, K
Research associate and professor, Ohio State University, Columbus, Ohio

Pages: 20    Published: Jan 1974

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Abstract

This investigation deals with the influence of several mix variables in respect to asphaltic concrete on its fatigue response.

The investigation was based on a simple model representation comprising a beam supported on elastic foundation subjected to sinusoidal repeated loading, thus providing a two-dimensional simulation of actual pavement conditions under traffic loads. The dimensions of the beam were designed such that plan strain conditions prevailed during fatigue loading.

Fracture mechanics concepts using linear elastic theory were employed to analyze test data, including stress and deformation near the crack tip. It was also hypothesized that the parameter, A, in the rate-of-crack-growth equation, dc/dN = A K⁴ would adequately reflect the changes induced in the fatigue response of the mix by the selected mix variables.

The effect of mixture variables such as the amount of binder, density, aging, and viscosity on the parameter A is investigated.