01373577

Component

Most of the mechanistic design methods used for flexible pavements do not take into account the environmental effects on the Hot Mix Asphalt (HMA) mechanical properties; the objective of this study is to consider these environmental effects on the main HMA mechanical properties, such as: the resilient modulus, the vertical permanent deformation and the fatigue strength. This paper presents the evolution of these mechanical properties for a typical Colombian HMA due to a 42 months environmental exposure in Bogota D.C. (Colombia). As a result, equations were developed in order to show the changes on the HMA mechanical properties due to the environmental effects, the general tendency for the HMA in the first 29 months of environmental exposure was the increase of the modulus due to aging of the asphalt binder. Also, the higher stiffness increases the resistance to permanent deformation, a phenomenon that could lead to increase the fatigue life of the HMA. It was noticeable as well that after 30 months of exposure, the resistance under repeated loading of HMA decreases.

This paper was sponsored by TRB committee AFK50 Characteristics of Asphalt Paving Mixtures to Meet Structural Requirements

01362476

12-3637

English

13p

2012

Transportation Research Board 91st Annual Meeting

Digital/other

Figures; References (19) ; Tables

Bituminous binders; Deformation; Environmental phenomena; Failure; Fatigue (Mechanics); Fatigue strength; Flexible pavements; Highways; Hot mix asphalt; Mechanical properties; Modulus of resilience; Repeated loads; Stiffness

Bogota (Colombia)

Design; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials

Transportation Research Board Annual Meeting 2012 Paper #12-3637

TRIS, TRB

Feb 8 2012 5:18PM