AsphVerbund 2
Process-reliable production of the bond between asphalt layers using performance-optimized bitumen emulsion

Research project : AsphVerbund 2

Project name Process-reliable production of the bond between asphalt layers using performance-optimized bitumen emulsion
Acronym AsphVerbund 2
Project partner
Grantor Zentrales Innovationsprogramm Mittelstand (ZIM AiF)
Duration 01.11.2021-31.10.2023
Project content
The durable bonding of asphalt layers is an essential requirement for a long service life of asphalt pavements. In order to achieve a sufficient bond, it is necessary to use a spraying agent (bitumen emulsion). The technical rules and regulations contain recommendations on the dosage of the spray agent depending on the type and condition of the base. The determination of the recommendations for the application rate is mainly based on empirical findings or investigations from research projects that have been carried out both in practice and in the laboratory. Based on these findings, the guidelines for the set of rules are defined in committees. The results of a research project of the Technical University of Darmstadt (FE 07.0285/2015/FGB) have shown that the bitumen emulsions and dosages provided for in the set of rules do not lead unerringly to a sufficient bond of asphalt layers due to their properties.
The aim of this research project is to redesign bitumen emulsions in accordance with their requirements and to define their necessary properties in such a way that their use leads unerringly to a sufficient bond between layers, resulting in a durable asphalt pavement and thus minimizing the warranty risk for SMEs. In particular, the focus should be on processability during the spraying process and targeted application. For this purpose, among other things, the technical requirements of the machines must be further developed so that the optimized emulsions can be applied in a more targeted manner in terms of their properties (viscosity, binder content, etc.) by modifying the existing machines.
Based on the findings, a comparison of the effectiveness with the currently used bitumen emulsions will be made. Evidence of the application results of the emulsion will be provided mainly by imaging methods (computed tomography (CT) and asphalt petrology).

Examination of layered composite by means of imaging techniques