Single-Sided Nuclear Magnetic Resonance as a non-invasive Tool to evaluate Sprayed Polymer Concrete

摘要

Single-sided nuclear magnetic resonance (NMR) is a powerful tool to evaluate building-material properties such as layer thickness, moisture content, and ageing. Due to its simple setup, it is potentially applicable on site. It is non-invasive with a high depth resolution and makes a number of parameters for planning and executing the rehabilitation of buildings as well as for quality assurance easy accessible. In this paper, we focus on the quality assurance of a sprayed polymer-concrete (SPC), which was recently developed by Massenberg GmbH and the Institute of Building Materials Research (ibac) for the repair of sewage systems. Single-sided NMR was used to access curing time of the epoxy binder, binder content, layer thickness, and diffusion of acids through the SPC. However, single-sided NMR measurements only give relative values, so calibrations are given where required. While single-sided NMR shows great potential and can be used in various farther applications, limitations of resolution, depth and measurement time need to be considered.