Magnetic Resonance in Studying Natural and Synthetic Materials

by

Victor V. Rodin

DOI: 10.2174/97816810862931180101
eISBN: 978-1-68108-629-3, 2018
ISBN: 978-1-68108-630-9





This book describes nuclear magnetic resonance (NMR) methods which are used to study translational dynamics of molecules in different ...[view complete introduction]
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Self-Diffusion of Water in Cement Pastes as Studied by 1H PFG NMR and DDCOSY NMR

- Pp. 163-179 (17)

Victor V. Rodin

Abstract

The chapter considers the data of one-dimensional 1H NMR diffusion studies in white Portland cement paste (the water-cement ratio (w/c) = 0.4) with the age of 1 to 14 days and 1 year. Two-dimensional diffusion-diffusion correlation (DDCOSY) experiments have been carried out in cement paste (w/c= 0.4) aged from 1 to 7 days. It was found that the 1H pulsed field gradient (PFG) NMR experiments measure diffusivities of capillary water. A log-normal pore size distribution and relaxation times dependent on pore size have been applied to fit the data. Mature paste has been characterized by mean capillary pore size of 4.2 μm. The data for cement pastes with the age of 1 week showed similarity. On the basis of data obtained it was suggested that gel porosity and hydrates do not form in the capillary porosity. 2D DDCOSY experiments did not discover any diffusion anisotropy in capillary pores.

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