Bridge deck concrete overlays -monitoring of cracking and general performance of two bridges

Concrete overlays on bridge decks are expected to be more durable compared with the more common asphalt solution. Of interest is to evaluate the concrete overlay regarding traffic and shrinkage/temperature induced stresses. In a pilot study nondestructive test systems were evaluated in field observations with focus on detecting hidden defects that may have induced identified surface cracks. Studies using NonDestructive Test methods (NDT) and drill core analyses were performed as well as visual inspection. The methods were to some extent considered as time consuming obtaining data and unclear regarding analysis. However, interesting information regarding e.g. cracking has been achieved that will be a base for selection of methods in future field tests of a research project supporting future theoretical analyses and models.