Assessing the spatial variability of concrete structures using NDT techniques - Laboratory tests and case study

In this study, the methodology consists of performing statistical analysis for assessing the spatial variability and estimating the required minimal number of NDT measurements. The spatial correlation of NDT measurements is studied with variographic analysis. Some correlation lengths were identified ranging 40-60 cm for the laboratory slab and the investigated bridge pier. Kriging method was used as a robust geostatistical tool, which allows the representation of the spatial variability of concrete structures.