Forschungsbereich Straßenwesen

Research Field Material Technology

The road engineering laboratory focuses on the improved testing of the complex properties of technical asphalts and their constituents (bitumen and rock) under realistic mechanical (traffic load-related) and thermal (climatic) loads. The aim is to create the basis for the optimised construction of highly loaded road constructions and innovative developments in road construction. Last but not least, the results provide necessary input parameters for the numerical modelling of road pavements.

Key Activities

  • Asphalt testing: performance based behavior addressing low temp. (TSRST, UTST), stiffness & fatigue (4PBB, DTC, DT, ITT), and high temp. (TCCT) | conventional behaviour (Marshall test, WTT, gyrator)
  • Bitumen testing: performance based behavior (DSR, BBR, RV, RTFOT) and conventional behavior (penetration, ring & ball, Fraass)
  • Mineral Aggregate Testing: LA drum, Micro-Deval, polishing & friction testing device acc. to Wehner-Schulze, polishing simulator, pendulum, texture detection by high precision laser device
  • Pavement monitoring: Grip-Tester, FWD, Evenness

Key Research Areas

  • Application and further development of laboratory tests for testing of road construction materials
  •  Correlations between performance requirements and mechanical parameters
  • Optimisation of the mix design of asphalt & asphalt additives for heavy loaded areas
  • Basics of the aging of bitumen and bitumen-bound mixtures, as well as the realistic simulation of field aging in the laboratory
  • Optimisation of noise emission through tyre/road interaction
  • Validation experiments for the multi-scale model of visco-elastic properties of asphalt and and bituminous binders

Current Research Projects

  • Developing and optimizing realistic ageing simulation for long-term evolution of bitumen and asphalt mixtures (VAPro)
  • Prediction model for friction and polishing resistance of surface layers (ProGrip)
  • Developing a test method to assess durability and compatibility of bitumen-filler (mastic) based on the DSR
  • New approaches for realistic simulation of road-tire interaction with regards to noise emission (TRIM)
  • Simplifying time-consuming performance based test methods on asphalt mix level by correlating performance of asphalt mix to mastic and bitumen level (VEGAS)
  • Developing effective additives for bituminous binders to enhance long-term durability (SAFERUP!)