Hydration kinetics of cements by Time-Domain Nuclear Magnetic Resonance: Application to Portland-cement-derived endodontic pastes

Journal Article · Thu Mar 15 00:00:00 EDT 2012 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2011.12.006· OSTI ID:21596962

Bortolotti, Villiam ^[1]; Fantazzini, Paola ^[2]; Mongiorgi, Romano ^[3]; Sauro, Salvatore ^[4]; Zanna, Silvano ^[3]

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1. Department DICAM, University of Bologna, Via Terracini 28, 40131, Bologna (Italy)
2. Department of Physics, University of Bologna, Viale Berti Pichat 6/2, 40127, Bologna (Italy)
3. Centre of Biomineralogy, Crystallography and Biomaterials, Department of Earth and Geoenvironmental Sciences, University of Bologna, Piazza di Porta S. Donato, 40127, Bologna (Italy)
4. Department of Dental Biomaterials Science Kings College, London Dental Institute at Guy's, King's College and St Thomas' Hospitals, Floor 17 Guy's Tower, Guys Hospital, London Bridge, London SE1 9RT (United Kingdom)

Time-Domain Nuclear Magnetic Resonance (TD-NMR) of {sup 1}H nuclei is used to monitor the maturation up to 30 days of three different endodontic cement pastes. The 'Solid-liquid' separation of the NMR signals and quasi-continuous distributions of relaxation times allow one to follow the formation of chemical compounds and the build-up of the nano- and subnano-structured C-S-H gel. {sup 1}H populations, distinguished by their different mobilities, can be identified and assigned to water confined within the pores of the C-S-H gel, to crystallization water and Portlandite, and to hydroxyl groups. Changes of the TD-NMR parameters during hydration are in agreement with the expected effects of the different additives, which, as it is known, can substantially modify the rate of reactions and the properties of cementitious pastes. Endodontic cements are suitable systems to check the ability of this non-destructive technique to give insight into the complex hydration process of real cement pastes.

• OSTI ID: 21596962
• Journal Information: Cement and Concrete Research, Vol. 42, Issue 3; Other Information: DOI: 10.1016/j.cemconres.2011.12.006; PII: S0008-8846(11)00331-0; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
36 MATERIALS SCIENCE
CALCIUM SILICATES
CRYSTALLIZATION
DISTRIBUTION
GELS
HYDRATES
HYDRATION
HYDROXIDES
MATURATION
PORTLAND CEMENT
REACTION KINETICS
RELAXATION
TD-NMR
WATER
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CEMENTS
COLLOIDS
DISPERSIONS
HYDROGEN COMPOUNDS
KINETICS
MAGNETIC RESONANCE
MATERIALS
NUCLEAR MAGNETIC RESONANCE
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RESONANCE
SILICATES
SILICON COMPOUNDS
SOLVATION