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- Title
Detection of Drying-Induced Microcracking in Cementitious Materials with Space-Resolved 1H Nuclear Magnetic Resonance Relaxometry.
- Authors
Beyea, Steven D.; Balcom, Bruce J.; Bremner, Theodore W.; Armstrong, Robin L.; Grattan-Bellew, Patrick E.
- Abstract
Nuclear magnetic resonance (NMR) relaxation time mapping in partially dried mortar is presented. Relaxation times in concrete are typically multi-exponential, and exhibit highly effective relaxation mechanisms (T[sub IL] ≈ 3 ms, Δv[sub ½] ≈ 2500 Hz). One-dimensional mapping of the spin-lattice relaxation time is used to study relative changes in the water-occupied surface-to-volume ratio, as a function of mixture conditions, initial hydration period, and drying time. These results provide evidence for a penetrating microcracking phenomenon, due to local drying-induced tensile stresses. This conclusion was further supported by a relaxation time study of samples which were preconditioned so as to be at equilibrium with various relative humidities.
- Subjects
MORTAR; NUCLEAR magnetic resonance; RELAXATION phenomena
- Publication
Journal of the American Ceramic Society, 2003, Vol 86, Issue 5, p800
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1151-2916.2003.tb03378.x