00757488

Component

https://doi.org/10.3141/1639-09

http://scholar.google.com...czak&publication_year=1998

Over the past two decades, a variety of permanent deformation models have been developed to predict rutting in asphalt pavements. Because all of these models are normally based upon laboratory tests in which very short loading and rest times are used, they may not reflect the true actual loading and rest times that may occur in the field service condition. To overcome this limitation, a research study was funded by the Maryland State Highway Administration at the University of Maryland to develop a universal permanent deformation model that could account for both loading and rest times upon its cyclic load behavior. A laboratory testing program was conducted using the cyclic creep test on a single asphalt mixture. The variables considered in the testing program were loading and rest times, both at three levels, and temperature and stress, each at two levels. Two replicate tests per cell were also used, resulting in a total of 72 test specimens being evaluated. Based on the lab test results, two types of empirical permanent deformation models have been calibrated. It was found that the empirical model coefficients, intercept and slope, and permanent deformation parameters, mu and alpha, were affected by both loading and rest times. Predictive equations were developed for the intercept, slope, mu, and alpha. The empirical permanent deformation models developed account for both loading and rest times at multiple temperature and stress levels.

This paper appears in Transportation Research Record No. 1639, Recent Pavement Research Issues.

English

p. 83-93

1998

Transportation Research Record

0309065119

Figures (7) ; References (4) ; Tables (5)

Asphalt mixtures; Asphalt pavements; Creep tests; Deformation; Loading and unloading; Mathematical models; Repeated loads; Rest periods; Rutting; Temperature

Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Dec 7 1998 12:00AM

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