Keywords
asphalt mix
additive
UCL method
pavement
Abstract
Many bituminous layers in pavements fail for associated problems with damage by material aging rather than damage caused by vehicle loads. In order to improve this situation, many solutions in the design that often consist in increasing the content of asphalt in the mixtures to achieve a thicker asphalt layer wrapping aggregates and to reduce the percentage of voids. Nevertheless, an excess of asphalt could generate asphalt exudation and lack of stability, as well as an increase in cost of the product.
Usually, asphalt road pavement specifications do not consider in a good way the factor of aging in establishing its prescriptions, insisting on characterizing the behavior of asphalts set against the mechanisms responsible for the "hardening by age", using empirical trials of simulation that only test the material working alone, not including the interaction that is produced with the other components of the mix.
The advantages of using additives (fílleres) specially formulated to improve resistance to aging is well known, however, many times other associated concepts are not considered but they affect the two-phase system fíller-asphalt and also have influence on a series of fundamental characteristics of the mixtures.
The universities de la Plata, Argentina, and technical college of Cataluña, Spain, carried out a joint research with the goal to understand some phenomena related to the aging of the asphalt and to establish guidelines of design that contribute to optimize the resistance of deterioration of the bituminous mixtures. In addition, new procedures of research were employed; the functional method "Universal of characterization of binders" (UCL®), reologic tests with the dynamic shear reometer (DSR) and techniques of macromolecular analysis as the chromatography by permeability of gels (GPC) and the spectroscopic infrared.
This first part of the study presents, a synthesis of the results obtained utilizing the universal method of characterization of binders, UCLⓇ.
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