Effect of Aging on the Properties of Asphalt and Asphalt Mixtures

Carlos Hernando Higuera Sandoval,Edwin Alexander Suárez Molano,Xiomara Vanessa Camargo Amaya

doi:10.11144/javeriana.iyu19-2.eapa

Carlos Hernando Higuera Sandoval, Edwin Alexander Suárez Molano + Show 1 more

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https://doi.org/10.11144/javeriana.iyu19-2.eapa

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Abstract

This article presents the results of the analysis of the effect of aging on the properties of asphalt and asphalt mixtures. The objective of this study was to compare the properties of the original asphalt and aged asphalt and the dynamic modulus of asphalt mixtures. The long-term aging was simulated by using Pressure Asphalt Vessel (PAV). Marshall and RAMCODES methodologies were used to determine the formula of work; values of dynamic modulus of designed mixtures were obtained by the indirect tensile test, using the Nottingham Asphalt Tester (NAT). The results showed an increase in the rigidity of the aged asphalt. Also, an increase of the stability and a decreased flow in the mixtures made with this type of binder was found. The dynamic modulus values of the mixtures containing aged asphalt showed an increase up to three times compared with those elaborated with original asphalt mixtures.

Highlights

Two types of aging affect the asphalt, in the short and long term; the first occurs at the moment of preparation of the hot asphalt mixture, while the second one will be happening during the useful life of the layer [1]
Materials Characterization It is important to know the physical characteristics of stone aggregate and asphalt for their use with different asphalts, as they are the main components of the asphalt mixture and their characteristics have an important incidence in the behavior of the mixtures
The analysis of the results show that the principal change between the mixtures made with original and aged asphalts can be seen in the stability and flow parameters

Summary

Introduction

Two types of aging affect the asphalt, in the short and long term; the first occurs at the moment of preparation of the hot asphalt mixture, while the second one will be happening during the useful life of the layer [1]. Both events cause a change in the physicochemical properties of the material, which will directly affect its durability, reducing the useful life period initially expected [2]. The oxygen acts over the more reactive components of the asphalt, appearing primarily as hardening [3], loss of viscoelastic consistency, fissuring, and cracking. Since the usefulness of the highway is affected by the pathologies generated by the aging process, it is necessary to perform different research projects with the idea of decreasing the effects of this phenomenon, in order to have a greater feeling of comfort and security at the time of making use of this infrastructure

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