Aging characteristics of bitumen related to the performance of porous asphalt in practice

Conference paper (2012)

Authors

S. Erkens Ministry of Infrastructure and the Environment
Affiliation
External organisation
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Published Date

2012

Language

English

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Affiliation

External organisation

Abstract

The performance of two layered porous asphalt (2LPA) surfaces is superior with respect to the reduction of noise produced by road-tyre interaction and the amount of splash and spray during rain, compared to dense surface layers. However, these open surface roads have a drawback with as they have a limited durability. It is assumed that aging of the binder which proceeds faster with these open mixtures has a negative influence on the service life.
However, both the principle driving forces behind aging and the relation between these aging processes and the mechanical properties and, thus, failure are still unclear. Therefore an extensive research program has been set-up to monitor the aging and the performance of 2LPA in practise. One asphalt mixture is applied at four different locations in the Netherlands. Samples are taken at different moments in time and material characteristics related to aging are determined on the binder. The actual performance with respect to ravelling is monitored through visual inspection.
In this paper the trends in material parameters related to aging are presented, showing that the complex modulus changes most significant over time. Visual inspection of the road shows that the service life can vary up to 25% for the same mixture. The section that performed best in practice showed the lowest complex modulus at different loading frequencies. Therefore there seems to be potential to look for a ravelling criterion based on rheological measurements for the expected performance of porous surface layers.