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Erschienen in:
2020 | OriginalPaper | Buchkapitel
Use of Combined Rheo-NMR to Investigate the Relationship Between the Molecular and Mechanical Properties of Early Cement Paste Hydration
verfasst von : Nonkululeko W. Radebe, Karl-Friedrich Ratzsch, Christopher O. Klein, Manfred Wilhelm
Erschienen in: Rheology and Processing of Construction Materials
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Abstract
The in-situ combination of rheological measurements with solid-state NMR as a second characterization method is used to gain unique information about molecular dynamics and structure of time-dependent phenomena. This study aims to show the application of low field benchtop 1H NMR relaxometry combined with rheology to investigate the hydration and hydration kinetics of cement pastes. Here the relationship between the storage modulus, G′ and transverse, T2, 1H-NMR relaxation rates in different water environments that exist during early hydration of cement paste at different water to cement ratios is presented. In addition, the rate of rigidification and percolation time are determined from the dynamic time sweeps at a strain within the linear viscoelastic region.