Methodology of the assessment of the interlayer bond in concrete composites using NDT methods

The paper presents multivariate methodology of assessing the interlayer bond in concrete composites using non-destructive testing (NDT) methods. This methodology eliminates the shortcomings of the pull-off method, which is used for this purpose in practice. Methodology of searching for the delamination of layers together with methodology of assessing the value of the pull-off adhesion between layers in existing composites with a constant thickness of the overlay has been shown. Also the methodology of evaluating the pull-off adhesion value between the overlay and the existing concrete substrate in newly made or existing composites which were repaired by applying a repair overlay has been presented. It has been indicated which NDT methods and also the aid of which specific parameters can be helpful to achieve this. Furthermore, an example of practical use of one of the methodologies, which confirms its usefulness in the evaluation of the pull-off adhesion, was also provided. It should be expected that the use of the proposed methodology could contribute to a more precise assessment of the interlayer bond in concrete composites, which could be useful for the acceptance of construction works.