STUDYING WITH A FULL-FIELD MEASUREMENT TECHNIQUE THE LOCAL RESPONSE OF ASPHALT SPECIMENS SUBJECTED TO FREEZE- THAW CYCLES

Abstract : In cold regions, pavements suffer from the thermal cracking caused by the contraction and expansion of asphalt under temperature changes. The thermal behavior of asphalt at the macroscopic scale has been widely studied using testing devices such as the Asphalt Thermal Cracking Analyzer (ATCA) [1] and the Asphalt Concrete Cracking Device (ACCD) [2]. However, since low temperature damages are initiated in the internal structure of asphalt mixtures, understanding the thermal response of asphalt components (bitumen and aggregates) is of great practical importance to have a better understanding of the overall thermal response of pavements. The major problem is however to measure the local thermal response of these materials. Full-field measurement techniques, which have now widely spread in experimental mechanics, are useful to have a better understanding of the asphalt behavior under thermal loadings. In recent years, these methods have become major tools to inspect and characterize the mechanical response of such materials. The main full-field measurement methods that are used by the pavement community are the digital image correlation (DIC) [3–5] and more recently the grid method (GM) [6,7]. This last technique was used here because it exhibits a good compromise between spatial resolution and measurement resolution [8], which is crucial here, the material under investigation being highly heterogeneous. Till now, the application of such measurement techniques for the characterization of asphalt was limited to their mechanical response, and few emphasis has been placed on the investigation of their thermal response. In this study, four Hot Mixtures Asphalt (HMA) specimens with 0%, 20%, 40% and 100% of RAP (Recycled Asphalt Pavement) content were considered. These materials were used in a previous study, which was devoted to the characterization of the effect of RAP on the local mechanical behavior of recycled asphalt pavements [6]. These RAP materials are composed of granite, basalt and gneiss. The virgin materials are constituted from limestone aggregates and a virgin bituminous binder. Freeze-thaw tests were carried out on these materials. They were performed in a climate chamber at a temperature range of [-10°C 20°C]. At the global scale, the specimens exhibited an anisotropic behavior along both the vertical and horizontal directions. The comparison of the global strain-temperature curves showed that the inclusion of 100% RAP resulted in an increase of the Coefficient of Thermal Contraction (CTC) of the specimen. Typical examples of the displacement fields obtained for the 100% RAP specimen at T=-10°C are shown in Figure 1.
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Contributeur : Evelyne Toussaint <>
Soumis le : jeudi 7 décembre 2017 - 09:35:17
Dernière modification le : jeudi 11 janvier 2018 - 06:28:14

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  • HAL Id : hal-01657726, version 1

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M Teguedi, B Blaysat, Evelyne Toussaint, S. Moreira, S Liandrat, et al.. STUDYING WITH A FULL-FIELD MEASUREMENT TECHNIQUE THE LOCAL RESPONSE OF ASPHALT SPECIMENS SUBJECTED TO FREEZE- THAW CYCLES. SEM (Society for Experimental Mechanics) Annual Conference, Jun 2017, Indianapolis, United States. 〈hal-01657726〉

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