“Incoming inspection of reclaimed asphalt by means of FTIR spectroscopy for optimised reuse in the asphalt mixing plant”.
Research objective and working hypothesis
The aim of the proposed research project is to develop and test a method for the
characterisation of road paving materials, which allows the identification of problematic
This will enable the identification of problematic constituents and modifications originally used in asphalts. If the analytical method investigated is suitable, the
At the end of the project, a test method will be available that can be used in the asphalt mixing laboratory, which will enable the FTIR measurement and the quantitative evaluation of the measurement in a user-friendly way.
Solution
The proposed solution for the development and testing of a method for the for the FTIR analysis of reclaimed asphalt to improve the reuse in asphalt mixtures comprises a total of nine work packages:
1. construction of an asphalt-specific spectral library for the identification of problematic constituents (e.g. PAHs) as well as common modifiers and additives. 2,
2. optimisation of the procedure for obtaining representative asphalt mortar samples from reclaimed asphalts for FTIR analysis,
3. laboratory conception of the FTIR analysis methodology on samples with known and defined
and defined composition,
4. validation of the FTIR analysis on representative asphalts with known composition with parallel analysis using conventional
methods,
5. practical testing of the FTIR analysis in an asphalt mixing plant.
finished by 28.2.2021 “Durability of the layer composite when using viscosity-changing organic additives in the asphalt”
finished by 31.1.2021 “Determination and parameterization of the cavity distribution in asphalt specimens using asphalt petrological methods”
Working hypothesis
The aim of the planned project is to design a preparation and analysis procedure for the differentiated
description of the void distribution of asphalts, which will mature to practical suitability in the medium
and less time-consuming implementation, this method will mature to practical suitability in the medium term.
Compared to conventional methods for determining the void content, a higher informative value with regard to the void distribution can be achieved. The knowledge gained can then contribute to the understanding of the interactions of asphalt constituents, as well as to the optimisation of mixtures and paving processes.
For example, the effects of small deviations in the grading curve or the binder content, but also those of the temperature on the cavity structure. It is possible that small parameters can lead to a significantly better structure and thus a longer durability of the asphalt pavement.
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