Suitability of subsequently installed vibrating wire sensors for direct stress measurement in concrete and mortar

Over the past decades, a major part of building infrastructure has aged and is now in need repair. In order to ease repair backlog be able distinguish between urgent long-term needs, it advisable install monitoring system structure. This is, among others, often based on periodical strain or deformation measurements, as they provide direct indication effect external loads structure (crack opening heavy deformations). Still, most available systems cannot installed subsequently are limited measurements surface. For structural behaviour inside specific components, use sensor vibrating wire measuring principle appears promising. proven itself geotechnical engineering. However, there no profound experience using this concrete structures. Therefore, aim work presented paper was investigate suitability these sensors for stress measurement mortar. We will furthermore give an outlook possible application reinforced