Risk evaluation on concrete strength assessment with NDT technique and conditional coring approach

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Breysse, D (Author) Other; Xavier Romão (Author) FEUP; Alwash, M (Author) Other; Sbartai, ZM (Author) Other; Luprano, VAM (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: JOURNAL OF BUILDING ENGINEERING

Vol. 32

ISSN: 2352-7102

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00S-AGJ

DOI: 10.1016/j.jobe.2020.101541

Abstract (EN): In-situ concrete strength assessment is commonly based on the implementation of Non-Destructive Tests (NDT) and coring of several specimens for Destructive Tests (DT). The most widely used non-destructive (ND) techniques are rebound hammer and ultrasonic pulse velocity. From the resulting data of NDT and compressive strength test results on specimens, a conversion law is identified which can then be used to estimate the compressive strength at any location in the structure. Since this process is very sensitive to many uncertainty sources, recent RILEM recommendations have revised the assessment paradigm by considering it in a probabilistic framework. The challenge is no longer to estimate the true concrete strength, but to limit the risk of a wrong estimation within a certain admissible interval. In this context, it is shown how synthetic simulations are used to capture the main features of this problem and are a firm basis for justifying the relationship between the most influencing parameters and the quality of the assessment. In addition, the effect of conditional coring, which consists in the selection of coring positions on the basis of previous NDT results, is highlighted and quantified. Finally, the methodology that makes possible to define the required number of cores for a given target accuracy is presented.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 13