Skip to Main content Skip to Navigation
Journal articles

Non destructive assessment of in situ concrete strength: comparison of approaches through an international benchmark

Abstract : Strength assessment of concrete in existing structures is a key issue. Many non destructive techniques (NDT) are available which can provide information about the material condition and several approaches can be used to derive strength estimates from NDT test results. However, common practice suffers from many drawbacks: (a) it is difficult to ascertain the level of accuracy/confidence of concrete strength estimates, (b) one lacks established guidelines for estimating the concrete strength variability, (c) the best way to combine NDT methods and coring remains an open issue. The RILEM TC 249 "Non destructive in situ strength assessment of concrete'' is addressing these problems. A benchmark was carried out in order to compare (a) how experts define and can carry out an NDT investigation program and (b) how experts derive strength values from the NDT measurements. The benchmark was based on synthetic simulations which reproduced a synthetic data set corresponding to a grid of twenty 3 m-high columns defining a single-storey building structure. The comparison of the various strategies and the analysis of results enabled identification of the most influential parameters that define an investigation approach and influence its efficiency and accuracy. A special emphasis was placed on the magnitude of the measurement error. A model of the investigation strategy is proposed, that will be detailed in future guidelines. The reader is invited to refer to a companion paper (Alwash et al. in Mater Struct, 1. doi: 10.1617/s11527-016-0962-x), based on more extensive Monte-Carlo simulations of the same case-study, which analyzes and quantifies the efficiency of the investigation strategies with respect to both average strength and strength variability assessment, in order to draw conclusions based on rational analyses rather than on the element of chance.
Document type :
Journal articles
Complete list of metadatas

https://hal.insa-toulouse.fr/hal-01847543
Contributor : Insa Toulouse Scd <>
Submitted on : Monday, July 23, 2018 - 4:06:59 PM
Last modification on : Friday, June 19, 2020 - 2:06:03 PM

Identifiers

Citation

D. Breysse, Jean-Paul Balayssac, S. Biondi, A. Borosnyoi, E. Candigliota, et al.. Non destructive assessment of in situ concrete strength: comparison of approaches through an international benchmark. Materials and Structures, Springer Verlag, 2017, 50 (2), pp.133. ⟨10.1617/s11527-017-1009-7⟩. ⟨hal-01847543⟩

Share

Metrics

Record views

183