Evaluation of the reliability of existing concrete structures often requires that the compressive strength of the concrete is estimated o nthe basis of tests performed with concrete samples from the structure considered. In this paper the CAPO-test method is considered. The different sources of uncertainty related to this method are described. It is shown how the uncertainty in the transformation from the CAPO-test results to estiamtes of the concrete strength can be modeled. Further, the statistical uncertainty is mdoeled using Bayesian statistics. Finally, it is shown how reliability-based optimal planning of CAPO-tests can be performed taking into account the expected costs due to the CAPO-tests and possible repair or failure of the structure considered. An illustrative example is presented where hte CAPO-test is compared with conventional concrete cylinder compression tests performed on cores taken in-situ.
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