MODELLING THE CHANGES IN PAVEMENT LAYERS DURING REHABILITATION AND THE EFFECT OF THESE CHANGES ON THE STRUCTURAL CAPACITY

Abstract eng:
Pavement rehabilitation / reconstruction usually involves the re-use and retention of existing pavement layers. Often, these layers are retained as sub-layers with the addition of strength in terms of new layers on the top of the pavement. Hence, in order to accurately analyse the behaviour of the rehabilitation effect, both the old as well as the new pavement layers need to be taken into account. A structural capacity analysis of the rehabilitated pavement, using mechanistic analysis procedures, requires the effective elastic moduli of the newly constructed pavement layers as well as that of the existing underlying pavement layers to be accurately modelled / simulated. The aim of this paper is to highlight the changes in stiffness values that take place during the rehabilitation of a pavement and the effect this has on predicted structural capacity. An experimental section of road was evaluated before and after rehabilitation and the stiffness and associated stresses were determined in-situ for the different uniform sections along the road (de Bruin, 2000). The material properties and the changes of the material properties for the different pavement layers were modelled using deflection bowl measurements of high frequency (every 4-6 meters along the length of the road). These changes were compared and the influence of the rehabilitation actions on the structural capacity (life) for the before (pre) and after (post) rehabilitation phases was assessed.

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