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

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• 作者：Villiam Bortolotti^a ; ^{villiam.bortolotti@unibo.it} ; Paola Fantazzini^b ; Romano Mongiorgi^c ; Salvatore Sauro^d ; ^e ; Silvano Zanna^c
• 关键词：NMR ; Kinetics ; Calcium&ndash ; silicate&ndash ; hydrate ; Hydration products ; Endodontic cements
• 刊名：Cement and Concrete Research
• 出版年：2012
• 期刊代码：12_00088846
• 类别：ms
• 出版时间：March, 2012
• 卷：42
• 期：3
• 页码：577-582
• 文件大小：669 K

摘要

Time-Domain Nuclear Magnetic Resonance (TD-NMR) of ¹H nuclei is used to monitor the maturation up to 30 days of three different endodontic cement pastes. The 鈥淪olid-liquid鈥?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. ¹H 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.