Cold recycling of reclaimed asphalt with bituminous binders (VSS2002/401)
Overview
Background & policy context:
Cold recycling of asphalt pavements with bituminous binders offers two main advantages. On one hand, the use of reclaimed asphalt helps to reduce the current excess, while on the other hand energy conservation and low emissions make cold recycling ecologically worthwhile. For these reasons, cold recycling of reclaimed asphalt has been used more frequently during the last 10 years in Switzerland in the form of cold mix foundations. However, a standard for state-of-the-art cold recycling does not exist yet.
Objectives:
The goal of this research project is to find target-oriented solutions to current questions in the field of material technology using established experience to develop the laboratory techniques and for the practical implementation. The key aspects investigated are specimen preparation and strength tests; additionally the study addresses suitable ways to assess the characteristics of the bituminous mixture and the built layer. Both, mixtures with foamed bitumen and cationic bitumen emulsions are examined. The conclusions of this research project should serve as a basis for revising the current standard.
Methodology:
The following steps will take place:
A) Capture the current state of the art
B) Laboratory part with the development of the bases of testing and the demonstration of formulation-related parameters influencing the material and environmental characteristic quantities. The mixtures produced in the laboratory and from mixing the following main parameters are included in the sub-Chung program:
- Variation of the PAH content in the starting material
- Variation of the recipe
- Comparison of different specimen preparation
- Comparison of the strength test
- Variation bitumen emulsion - foamed bitumen
- Analysis of the starting material and the processed material in a condensed form (specimen) for PAH and phenol in the eluent.
C) Practical part with accompaniment from installations, capture the decisive parameters for the qualitative assessment of the production and installation.
D) Reporting
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