Optimization of bitumen emulsions to achieve the best possible bond of layers

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Generally, an asphalt pavement consists of different asphalt and unbound layers. The bound between two superposed asphalt layers is realized by a wide range of varied types of bitumen emulsions, which are applied over the entire layer surface. However, only little information is available on bitumen emulsions, which guarantee particularly good long-term behavior of the layer bound. The paper presents selected results of a research focused on the increase of the shear stiffness respectively on the permanent layer bond through the use of specially developed bitumen emulsions / mortar in the interface of two asphalt layers. The main objective of the project is the development of a particularly durable bitumen emulsion. This emulsion is intended to ensure an improved bonding effect in the context of road maintenance between already existing asphalt base layers and new asphalt binder layers to be realized, especially on critical surfaces (e.g. milled surfaces). To achieve this goal dynamic shear tests were conducted on asphalt specimens bonded with different emulsions by using a newly developed testing device. Therefore, in particular a temperature range as wide as possible was considered, combined with varying the test frequencies and normal stresses applied to the test specimens. Based on the results of the dynamic shear tests bitumen emulsions especially suitable for an application in practice were selected. The investigation and comparison of these selected materials are presented and discussed in the corresponding contribution. The discussion includes design life calculations involving a special developed model describing the tested layer bond.


Original languageEnglish
Number of pages12
Publication statusPublished - 2020


Title7th Eurasphalt & Eurobitume Congress
Conference number
Duration15 - 17 June 2021
Degree of recognitionInternational event



  • Schichtenverbund, Asphalt, Bitumenemulsion, Dimensionierung, Straßenbau