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Ouni A.E.,Institute Of Recherche En Constructibilite | Dony A.,Institute Of Recherche En Constructibilite | Colin J.,Institute Of Recherche En Constructibilite
International Journal of Pavement Engineering

This paper deals with a stochastic approach to evaluate the rut depth of hot and warm bituminous mixtures. First, the rutting performance of both mixtures using the French rutting tester device was evaluated. Given the random uncertainties derived from the numerous experimental measurements of the rut depth, statistical information was collected. Accordingly, the entropy maximum principle was used here to define adequate probability density function of the rut. Confidence regions with a high probability of 99% were determined for the estimation of the rut depth. In addition, comparison of mechanical and rheological results is performed with aged bitumen recovered from reclaimed asphalt and virgin bitumen to analyse the effect of ageing on bitumen viscoelastic properties. The experimental characterisation of the different binders based on rheological and conventional tests showed stiffening and hardening effects due to bitumen ageing. © 2014 Taylor & Francis. Source

Senga Y.,Ecole Normale Superieure de Cachan | Senga Y.,Institute Of Recherche En Constructibilite | Senga Y.,Departement Laboratoire Et Center Detudes Of Conception Of Prototypes Dangers | Dony A.,Institute Of Recherche En Constructibilite | And 3 more authors.
Construction and Building Materials

In France, the aggregates used in surface course must meet to very strict requirements. Indeed, the surface course sustains a lot of stresses which are caused by road traffic: high local pressure of contact with the wheels, friction and polishing. Due to these conditions, the aggregates used for that layer must meet requirements directly linked to their intrinsic characteristics. For these reasons, the aggregates possessing high mechanical properties are particularly needed. However, there are many inequalities on the territory because the production of aggregates is localised in a quarter of the departments. These inequalities (in terms of resources and needs) and the context of sustainable development led to wonder about a better management of the aggregates. This work is based on the study of behaviour of granular blends constituted with two materials having different characteristics. Many proportions have been established for these blends. The wear and polish resistances have been measured by traditional normalised tests (Micro-Deval and Polished Stone Value) completed by tests with the Wehner & Schulze machine. A procedure of preparation of the samples have been studied and defined for these tests. The results lead to the proposition of a mixture law to predict the properties of the granular blends. © 2013 Elsevier B.V. All rights reserved. Source

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