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The potential of nuclear magnetic resonance (NMR) to non-destructively characterize early-age concrete by an one-sided access (OSA) technique

 
: Dobmann, G.; Kröning, M.; Surkowa, N.; Bernus, L. von; Wolter, B.

Indian Society for Non-Destructive Testing:
NDE 2002 : 5 - 7 December 2002, ISNT Chapters in Chennai, Kalpakkam & Sriharikota
Hyderabad: Indian Society for Non-Destructive Testing, 2002
Paper 91
NDE <2002, Chennai>
Englisch
Konferenzbeitrag
Fraunhofer IZFP ()
nuclear magnetic resonance (NMR); one-sided access NMR (OSA NMR); concrete

Abstract
Hydrogen nuclear magnetic resonance (1H NMR) is a direct method to determine the hydrogen content and with it the water content (moisture) in solids. Simultaneous it is highly sensitive probe of local, molecular-scale dynamical information in the 1 to 108 Hz frequency range, allowing to characterize structure molecular dynamics in hydrogenous liquids as well as in hydrogenous solids. Recent research results have demonstrated the extensive capability of NMR for characterizing structural properties in porous media. For a long time, NMR instrumentation was found only in laboratories of institutional and industrial research facilities. Meanwhile, for outside laboratory application and for nondestructive inspection of large objects special NMR devices are available, based on the one-sided access (OSA) NMR approach. Using this hardware type, many technologically valuable NMR applications could be transferred in nondestructive testing methods. This presentation will review the possibilities of OSA NMR for the characterization of porous solids, including the determination of moisture profiles in different materials, the investigation of specific surface and restricted diffusion in stones and the characterization of concrete hardening. Applications in terms of building inspection, geophysical investigations and examination of organic materials will be discussed.

: http://publica.fraunhofer.de/dokumente/N-15104.html