01090263

Component

https://doi.org/10.3141/2087-01

http://scholar.google.com...pson&publication_year=2008

In the design of extended-life hot-mix asphalt pavements (ELHMAP or perpetual pavements), the fatigue endurance limit is the key element. Thus, horizontal tensile strain at the bottom of the hot-mix asphalt layer is the critical design parameter. This paper presents results of a study performed at the University of Illinois test facility that focused on the evaluation of the most critical pavements responses for ELHMAP design. Longitudinal and transverse tensile strain pulses were measured in four sections tested with the accelerated pavement testing machine. A very strong relationship between the longitudinal and transverse pulse durations was found. In general, the transverse pulse durations were about three times those in the longitudinal direction. A relationship between longitudinal and transverse tensile strains was also found. Generally speaking, the transverse tensile strains were about 1.5 times greater than those in the longitudinal direction. The haversine function was the best representation for the longitudinal and the transverse strain pulses. The transverse pulse is very sensitive to the lateral position of the moving load. As the offset of the moving load increases, the rate at which the transverse tensile strain decreases is considerably greater than that of the longitudinal tensile strain. Moreover, if the moving load passes far enough from the strain gauge location, the transverse strain pulse reverses from tension to compression.

01121592

English

pp 3-12

2008

Transportation Research Record: Journal of the Transportation Research Board

9780309126007

Print

Figures (11) ; References (13) ; Tables (2)

Accelerated tests; Asphalt pavements; Fatigue (Mechanics); Hot mix asphalt; Pavement design; Pavement performance; Perpetual pavements; Tension

Pulse duration

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

TRIS, TRB, ATRI

Jan 29 2008 2:30PM

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