Title:

Constitutive Model for Bituminous Stabilized Materials and Modelling of Cold Recycled Pavement Layers

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 [1,2,3]. There have been limited studies focusing on mechanical properties of those mixtures and on their performance with respect to the service lives of pavement structures with in-place recycled layers. For this reason, this research focuses on the design of a constitutive model for different types of BSMs and on the modeling of flexible pavement structures with BSMs as base layers. A 3D Elasto-Plastic model was created using ABAQUS software in order to calibrate and validate the constitutive mechanical properties of the different cold mixtures, the outputs obtained were then used in a multilayer axisymmetric 2D model for traffic simulation. The modelled structures were subjected to a cyclic loading of 0.1 second with 0.9 second 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.

Name

Comment*

Comments are viewable only by submitter

Captcha*