Detection of Drying-Induced Microcracking in Cementitious Materials with Space-Resolved 1H Nuclear Magnetic Resonance Relaxometry

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 (T1L∼ 3 ms, Δν1/2∼ 2500 Hz). One‐dimensional mapping of the spin–lattice relaxation time i...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2003-05, Vol.86 (5), p.800-805
Main Authors: Beyea, Steven D., Balcom, Bruce J., Bremner, Theodore W., Armstrong, Robin L., Grattan-Bellew, Patrick E.
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
concrete
Concretes. Mortars. Grouts
Exact sciences and technology
General (composition, classification, performance, standards, patents, etc.)
Materials
Measurements. Technique of testing
microcracking
nuclear magnetic resonance
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
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Description
Summary: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 (T1L∼ 3 ms, Δν1/2∼ 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.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2003.tb03378.x