About a half of the Austrian highways are rigid pavement constructions, and increasingly more money has to be invested in the renovation and the redevelopment. However, there are different approaches for the evaluation of the condition and the assessment of concrete pavements, which automatically leads to variations in the development of maintenance concepts.
The result of our research is a concept for assessing the condition of a road section in rigid pavement. This consists of a structural- and a visual assessment scheme for selecting appropriate maintenance actions.
For the verification of this new method of assessment of concrete pavements, three field tests (one route twice) were examined. In each case, a visual assessment was carried out, the deflections were measured with the Falling Weight Deflectometer (FWD) and, in addition, drill cores for material technology tests were drawn. The tracks of these field tests differ in structure, age and previous applied load.
The FWD measurements were carried out radial for the first time (instead of linear). The results show possible inhomogeneities in the subgrade or in the bedding, which would not be recognizable by the standardized line measurement. It was evident from the material-technological tests of the drill cores that the strength values in particular are of little significance for determining the fatigue degree, while the stiffness values provide clearer results.
With the results from the already mentioned measurements, the remaining service life of the test tracks could be calculated.