Abstract
This paper presents results of laboratory tests on hot and warm bituminous mixtures produced with Reclaimed Asphalt Pavement (RAP). Additives were used to produce warm bituminous mixtures. Fatigue behaviour and thermomechanical behaviour at low temperature were investigated. Fatigue was studied by analysing the tension/compression fatigue test results. Four different failure criteria were used in order to evaluate fatigue life. The low temperature behaviour of the materials was characterized using the Thermal Stress Restrained Specimen Test (TSRST). For each material, three replicates were performed. The experimental device was improved so that radial strains in two directions could be measured during the tests. Tri-dimensional behaviour could thus be investigated. The results of both tests were analysed and the influence of the void content, RAP content, type of additives and manufacturing process was evaluated. The results show that RAP addition and warm bituminous mixtures could be combined to obtain mixtures with performances comparable to classical hot mixtures.
Highlights
The development of several innovations for the construction and rehabilitation of infrastructures is boosted by societal concerns about sustainable development and preservation of the environment
Such a high Reclaimed Asphalt Pavement (RAP) content combined with warm bituminous mixtures, as well as the fatigue and low temperature behaviours that are rarely studied for such materials, makes this study original
The principle of the Thermal Stress Restrained Specimen Test (TSRST) is to keep the length of the tested specimen constant while decreasing the temperature inside the thermal chamber at a constant cooling rate of −10 ◦C/h, starting at 5 ◦C
Summary
The development of several innovations for the construction and rehabilitation of infrastructures is boosted by societal concerns about sustainable development and preservation of the environment. Several authors ([17,21,22,23,24,25,26,27,28,29,30,31,32,33] among others) have studied the use of RAP materials in road construction They show that this is a valuable technique, especially for viscoelastic properties and rutting resistance. Such a high RAP content combined with warm bituminous mixtures, as well as the fatigue and low temperature behaviours that are rarely studied for such materials, makes this study original
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