The results of a magnetic resonance spin-spin relaxation analysis and broad-line magnetic resonance imaging (MRI) (gradient-echo and stray-field imaging) study of water and water transport in Portland cement pastes are presented. The effect of varying the cure conditions and the water to cement (w/c) ratio of the sample mix are discussed. The water sorptivity and the concentration dependence of the hydraulic diffusion coefficient are calculated for samples prepared with a 0.5 w/c ratio and, therefore, an open pore structure. In the case of 0.3 w/c ratio samples, little water transport is observed, and a closed pore structure is inferred.
Bibliographical noteFunding Information:
The authors thank the UK Science and Engineering Research Council for Research Grant GR/K94881. A.J.B. also thanks the council for a studentship.
- Magnetic resonance imaging
- Stray field imaging (STRAFI)