Cold recycling techniques are becoming more and more popular everywhere in the world, as it is well proven that bituminous stabilized mixtures (BSM) are sustainable both from an environmental and economical point of view. There have been limited studies focusing on the performance of BSMs with respect to the service lives of pavement structures with in-place recycled layers. For this reason, this research focuses on the modelling of multilayer structures with different layer combinations and thicknesses. The aim is to compare structures with different base layer solutions, such as BSM, typical granular unbound base layer, and combinations of those two. Finite element analysis software has been used to construct axisymmetric elasto-plastic 2D models of various pavement cross-sections. The modelled structures were subjected to a cyclic loading of 0.1 s with 0.9 s of rest period. The load applied on the structures has been calibrated in order to have a comparable effect to the real tire pressure experienced by the structures under traffic. Rutting evolution curves until a failure threshold value of 20 mm have been developed and the results have clearly shown how the BSM as a base layer can provide superior or comparable performance in terms of rutting as compared to granular virgin material.
Rutting Performance Analysis for Pavements with Bituminous Stabilized Mixtures as Base Layers / Gouveia, B. C. S.; Preti, F.; Romeo, E.; Dave, E. V.; Tebaldi, G.; Sias, J. E.. - 27:(2022), pp. 1649-1655. (Intervento presentato al convegno RILEM International Symposium on Bituminous Materials tenutosi a Lyon nel Dicembre 14-16 2020) [10.1007/978-3-030-46455-4_209].
Rutting Performance Analysis for Pavements with Bituminous Stabilized Mixtures as Base Layers
Preti F.
;Romeo E.;Tebaldi G.;
2022-01-01
Abstract
Cold recycling techniques are becoming more and more popular everywhere in the world, as it is well proven that bituminous stabilized mixtures (BSM) are sustainable both from an environmental and economical point of view. There have been limited studies focusing on the performance of BSMs with respect to the service lives of pavement structures with in-place recycled layers. For this reason, this research focuses on the modelling of multilayer structures with different layer combinations and thicknesses. The aim is to compare structures with different base layer solutions, such as BSM, typical granular unbound base layer, and combinations of those two. Finite element analysis software has been used to construct axisymmetric elasto-plastic 2D models of various pavement cross-sections. The modelled structures were subjected to a cyclic loading of 0.1 s with 0.9 s of rest period. The load applied on the structures has been calibrated in order to have a comparable effect to the real tire pressure experienced by the structures under traffic. Rutting evolution curves until a failure threshold value of 20 mm have been developed and the results have clearly shown how the BSM as a base layer can provide superior or comparable performance in terms of rutting as compared to granular virgin material.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
