Ravelling is a common mode of early failure for many types of asphalt pavement. There are several potential causes for this loss of aggregate particles, so it is difficult to assess the theoretical potential to ravel of an asphalt mixture in the design stage. Recently, several simulative laboratory tests have been developed that are claimed to give an indication of that potential. These tests use scuffing machines that repeatedly apply a scuffing action to slab ~ samples to replicate in service loading. The test methods for four such scuffing machines have been written up as a draft technical specification by Comité Européen de Normalisation (CEN) as prCEN/TS 12697-50, Resistance to scuffing. However, these methods need rationalised so that one single measure exists that has good precision and is validated
against site performance.
This project will seek to validate existing testing methods to simulate asphalt ravelling in laboratory conditions. The appropriate CEN committees responsible for draft technical specification prCEN/TS 12697-50, Resistance to Scuffing will be engaged in the course of the project. The project has eight partners coordinated by TRL. Ravelling tests will be coordinated across six laboratories at: BRRC (Belgium), IFSTTAR (France), BAM and Heijmans (the Netherlands), and TU Darmstadt and ISAC-RWTH (Germany). Independent assessment of the results will be undertaken by TNO (the Netherlands) and TRL.
DRaT has been commissioned by CEDR in response to the 2014 call on Asset Management and aims to build on the results of the previous 2010 ENR call on “Effective Asset Management meeting Future Challenges”.
The consortium has eight partners and five work packages:
Coordinating and leading WP1 (review) & WP5 (dissemination)
Leading WP2 (sample preparation) and testing using the ARTe device
Leading WP3 (test programme) and testing using the DSD device
Leading WP4 (analysis)
Testing using the ARTe device
Testing using the DSD device
Testing using the RSAT device
Testing using the Triboroute device
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