01514913

Component

https://doi.org/10.3141/2401-02

http://scholar.google.com...luer&publication_year=2014

This paper presents findings from an ongoing research study at the University of Illinois that aims to develop and calibrate improved models for unbound aggregate rutting through laboratory characterization of aggregate materials used for unbound base and subbase applications in the state of North Carolina. Extensive triaxial laboratory testing was performed to establish a robust link between the number of load applications, stress levels, shear stress and sheer strength ratios, and permanent deformation responses. A framework was established for considering the strong correlation that commonly exists between permanent deformation and shear strength characteristics, as opposed to resilient modulus properties, in the laboratory characterization of the permanent deformation behavior of various types of aggregate materials. Trends of permanent strain accumulations from repeated load triaxial tests were adequately captured in a new rutting model whose development took into account the shear stresses applied at 25%, 50%, and 75% of the shear strength properties of these materials under similar field loading confinement conditions. The research shows that this model is an improvement on the rutting damage model for unbound aggregate currently used in AASHTO’s mechanistic–empirical pavement design approach because it offers better material characterization and rutting prediction of the unbound base or subbase layer.

01529205

14-4319

English

pp 11–21

2014

Transportation Research Record: Journal of the Transportation Research Board

9780309294942

Print

Figures (7) ; References (30) ; Tables (3)

Aggregates; Deformation; Mechanistic-empirical pavement design; Modulus of resilience; Pavement distress; Repeated loads; Rutting; Shear strength; Subbase (Pavements)

Unbound aggregates

North Carolina

Geotechnology; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I36: Aggregates

TRIS, TRB, ATRI

Jan 27 2014 3:30PM

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