Physical and chemical chloride binding in cementitious materials with various types of binder

• 作 者: MickaelSaillio[1]VéroniqueBaroghel-Bouny[2]SylvainPradelle[2]
• 机 构: IFSTTAR (former LCPC), Materials and structures department, 77447 Marne-La-Vallée, France
• 出 处: The 14th International Congress on the Chemistry of Cement (
• 发表日期: 2015年期

　　Chloride-induced corrosion is one of the main causes of reinforced-concrete structure degradation.Chloride ingress is delayed by the interactions between chlorides and the cementitious matrix.In this paper, these interactions have been investigated on various mixtures (cement pastes and concretes) with or without supplementary cementitious materials (SCMs) such as fly ash, slag or metakaolin (MK).Chloride binding isotherms (CBIs) were assessed by the equilibrium method after four times of water curing.The cement pastes microstructure was characterized not only by usual techniques such as XRD and TGA-DTA, but also by 29Si and 27Al NMR spectroscopy.For example, both Friedels salt formation (chemical binding) and physical binding have been quantified by 27Al NMR spectroscopy and XRD on cement pastes.