2020 BMWi - ZIM: Optimized compact superstructure with fiber-modified tension band
Optimized compact asphalt superstructure with fiber-modified tension band
Subproject: Investigation of glass fiber modified asphalt binder and asphalt base course materials with regard to homogeneity and material properties as well as determination of the remaining service life of the compactly paved asphalt pavement with a tension band
Project staff
Contracting authority
Ferderal Ministry of Economic Affairs and Energy
Support program
Central Innovation Program for small and medium-sized enterprises
Project period
04/2020 - 09/2022
Project executing agency
Abstract
With regard to the higher traffic loads and volumes that will occur in the future, as well as the more extreme thermal loads, the development and application of innovative construction materials and optimized pavements is necessary for an available infrastructure. Modification of asphalt binder and asphalt base course materials has been shown to result in improved material properties and thus longer service life of the asphalt pavement. The addition of bitumen-coated glass fiber pellets is designed to ensure that the fibers can be homogeneously distributed during automatic batching at the mixing plant. Since it is known that the greatest tensile stresses occur at the bottom of the asphalt base course when the layers are fully bonded, resulting in cracking from below, the superstructure is extended by a modified tension band underneath the asphalt base course, which is particularly suitable with regard to the tensile stresses occurring. Due to the possible reduction of the layer thickness and in order to achieve a good bond between the layers, which has a decisive influence on the service life, the four asphalt layers can and should be paved in two compact layers.