The efficiency of NDT methods in existing concrete structures

Abstract

In this thesis, different NDT methods have been investigated for reinforced and post-tensioned concrete structures. The durability of these structures is mainly affected by concrete composition and deterioration. For that reason, assessment of existing structures is a fundamental approach to ensure long-term performance. This aspect entails that structural condition is monitored by collecting essential data during the service life of the concrete structure, which provides an insight into the structural behavior. Therefore, NDT methods are integrated with SHM to estimate the remaining service life of concrete structures. There are advantages and limitations to applying NDT methods, and the principles of the NDT categories are conclusive for the capability to detect different problems. However, available equipment for NDT methods influences the reliability and interpretation of obtained data. Technical specifications and algorithms for NDT methods can differentiate depending on accuracy, depth, and frequency range. Variations in these parameters can result in the imprecision of promising data, influencing the degree of detection for concrete deteriorations.