Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Detection of drying-induced microcracking in cementitious materials with space-resolved 1.H nuclear magnetic resonance relaxometry
Nuclear magnetic resonance (NMR) relaxation time mapping in partially dried mortar is presented. Relaxation time in concrete are typically multi-exponential, and exhibit highly effective relaxation mechanisms (T1L = 3ms, delta(f) = 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 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.
Detection of drying-induced microcracking in cementitious materials with space-resolved 1.H nuclear magnetic resonance relaxometry
Nuclear magnetic resonance (NMR) relaxation time mapping in partially dried mortar is presented. Relaxation time in concrete are typically multi-exponential, and exhibit highly effective relaxation mechanisms (T1L = 3ms, delta(f) = 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 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.
Detection of drying-induced microcracking in cementitious materials with space-resolved 1.H nuclear magnetic resonance relaxometry
Feststellen von trocknungsinduzierter Mikrorißbildung in zemententhaltenden Werkstoffen mittels räumlich auflösender magnetischer 1.H-Kernresonanz
Beyea, S.D. (Autor:in) / Balcom, B.J. (Autor:in) / Bremner, T.W. (Autor:in) / Armstrong, R.L. (Autor:in) / Grattan-Bellew, P.E. (Autor:in)
Journal of the American Ceramic Society ; 86 ; 800-805
2003
6 Seiten, 6 Bilder, 19 Quellen
Aufsatz (Zeitschrift)
Englisch
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