Abstract
Climatic and traffic effects are the causes of aging of the surface layer of asphalt, which leads to the necessary renovation of the latter. The use of waste from the tread layer provides a viable and beneficial solution for the environment and the economy. However, this solution must meet the requirement of sustainable development, which necessitates that a road has a very long lifespan. In this study we investigated the performance of recycled asphalt in terms of fatigue (as an element of life-cycle control). All the formulas were tested by the fatigue test in order to define the influence of the proportions of the asphalt aggregates, penetrability of the new binder used, and the manufacturing temperature. The results obtained showed the relationship between the contribution binder (reproduced between the new binder and the old binder) and the fatigue resistance under the influence of the parameters that we have mentioned above. At the end an optimization study has been carried in order to determine exactly the doses required to formulate recycled asphalt resisted to fatigue, the optimization seeks to maximize the asphalt aggregates and minimized the temperature of manufacture with a class of the binder compatible.
Highlights
Surfaced roads age under the effects of traffic and climate, which lead to the end of their life, in increments that reflect the functions required by the regulations, or the needs envisaged by the employer, (Abdelhak et al, 2016-a)
For mixtures made with new binder class (35-50) and a temperature of manufacturing equal T ° = 120 °, resistance to fatigue, represented on the, is low for mixes when asphalt aggregate rates of exceeds 25%, reflecting that the temperature was unable to transform the old binder to the presence of the new binder a contribution binder that has the characteristics required by regulation
For mixtures made with a binder of class (50-65) the results gave acceptable resistance to fatigue for all formulas because the contribution binder reproduced by new binder and old Binder has got a penetrability compatible with the recycled asphalt formulated (BBSG), presented in the
Summary
Surfaced roads age under the effects of traffic and climate, which lead to the end of their life, in increments that reflect the functions required by the regulations, or the needs envisaged by the employer, (Abdelhak et al, 2016-a). In this study we checked the effect of the penetrability of the contribution binder, asphalt aggregate dosing and the temperature of manufacturing on the resistance to fatigue of recycled asphalt. The hypothesis in this work is that asphalt aggregates have a percentage of old binder which can cause fatigue for recycled asphalt, but that very precise control of the ‘contribution binder’ (old binder + new binder) of recycled asphalt can show us a new binder corresponding to the percentage of asphalt aggregates used Such close control permits analysis of the temperature of manufacturing, such that the mixture (old binder and new binder) may take the form of a contribution binder compatible with the features of recycled manufactured asphalt. A program of fatigue tests was carried out to determine the resistance to fatigue of recycled asphalt formulated with binders of various degrees of penetrability. The fatigue in the laboratory test was to determine the deformation ε6 leading to the rupture of a specimen by fatigue under certain test conditions, (Guthrie et al, 2007)
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