Main challenges of non destructive evaluation of on-site concrete strength

Author(s): D. Breysse
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 246 - 247
Total Pages: 2
Language: English

Abstract: 
Non Destructive Evaluation (NDE) of concrete strength is a key challenge, since strength estimation is a fundamental step for assessing mechanical performances of existing buildings. Non Destructive Techniques only provide an indirect mean of investigating mechanical performances and overoptimistic statements have often been done about the ability of NDTs. A consequence is a general reluctance of practitioners to use NDT. The combination of two measurements, e.g. acoustic wave velocity and rebound number in the case of “SonReb” combination, can be used for reducing the uncertainty on strength estimation. A careful attention on a variety of data sets previously published will enable to understand why results may appear contradictory. The underlying consistency will be highlighted. We will analyze the role played respectively by (a) the range of strength of the investigated concrete, (b) the quality of the two NDT measurements, (c) the prior model. It will be shown how a prior law (double power function) can be calibrated on laboratory or field data, in order to estimate the on-site strength with a given level of uncertainty, small enough to make NDT assessment efficient.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00