Mechanical properties of porous asphalt, proposals for standardisation (VSS1999/280)
Overview
Background & policy context:
The Swiss standard SN 640433b "Courses with porous asphalt" was adopted January 1st and specifies volumetric properties as well as the drainability of porous asphalt. However, water sensitivity and mechanical properties are not specified.
Especially on motorways but also on other roads, wearing courses of porous asphalt are subjected to the same stresses as any other types of bituminous layers. In addition to stresses common to all layers (permanent deformation, fatigue, thermal stress) there are stresses more specific to porous asphalts (water sensitivity and particle loss). To be consistent in striving for a fundamental approach, mechanical properties suitable for porous asphalts have to be evaluated.
Objectives:
The goal of the research project is the evaluation of performance orientated mechanical tests applicable for porous asphalts. Depending on the course (wearing course, binder course and base course for drainage), the relevant properties of the course will be identified and the sets of tests proposed to assets the courses. The sensitivity to water will be given special concern. The research will result in proposals for testing standards. It should suggest values for specification.
Methodology:
The research builds on existing routes and their behavior. The research institutes have identified:
- Module as a material characteristic value (all layers)
- Fatigue behavior (top layer)
- Low-temperature behavior (top layer)
- Stable speed (surface and binder)
- Abrasion resistance (top layer)
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