OPTIMIZATION OF THE NUMBER OF TESTS FOR THE MONITORING OF A WORK OF ART

Abstract

Non-destructive testing techniques (NDT) are essential toinvestigate structures in order to assess properties ordetect anomalies (cracks, pathologies, etc.) in the con-crete. Due to budget limitations, an optimal methodologyto estimate the integrity of a structure with a minimum costis required. Destructive tests (DT) would eventually benecessary to corroborate the information obtained NDT. This paper presents an efficient way to place thecores to extract by doing a spatial optimization of two con-crete properties: Compressive strength and saturationdegree. They were obtained after the fusion of three NDTtechniques (capacitive method, ultrasound and impactecho). This spatial optimisation is made by the optimisa-tion spatial sampling method (OSSM) and is based on theproperties spatial correlation. It was used a multi-objec-tive approach due of the interest in obtaining the bestinformation possible of the two properties at the same timeand also a systematic approach for a small number ofcores to extract. Some results on a thermal power plantwall in Le-Havre – France will be presented