title: A broad line NMR and MRI study of water and water transport in Portland cement pastes.
abstract: 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 of 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.
authors.affiliation: School of Physical Sciences, University of Surrey, Guildford, UK.
authors.forename: A J
authors.initials: AJ
authors.lastname: Bohris
authors.forename: U
authors.initials: U
authors.lastname: Goerke
authors.forename: P J
authors.initials: PJ
authors.lastname: McDonald
authors.forename: M
authors.initials: M
authors.lastname: Mulheron
authors.forename: B
authors.initials: B
authors.lastname: Newling
authors.forename: B
authors.initials: B
authors.lastname: Le Page
mesh_terms: D002484:Cementation; D003252:Construction Materials; D004058:Diffusion; D006801:Humans; D008279:Magnetic Resonance Imaging; D009682:Magnetic Resonance Spectroscopy; D009824:Ointments; D016062:Porosity; D012212:Rheology; D014867:Water
chemical_list: D009824:Ointments; D014867:Water