Chloride Binding Isotherm from Migration and Diffusion Tests
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2013年第3期
论文作者：元强 DENG Dehua SHI Caijun De Schutter Geert
文章页码：548 - 556
摘 要：Chloride binding is often described by chloride binding isotherm, which is closely related to the service life of concrete structures in chloride environments. Many methods have been proposed to determine chloride binding isotherm. Compared to other methods, chloride binding isotherms obtained directly from non-steady-state diffusion tests seem closer to the reality. We studied the chloride binding isotherm from both non-steady-state electrical-accelerated migration and diffusion tests at different temperatures. Twelve concrete mixes with different supplementary cementing materials and water-to-binder ratios of 0.35, 0.48 and 0.6 were cast for study. The specimens after diffusion （or migration） tests were sliced layer by layer, and acid-soluble and free chloride contents of each layer were measured. A chloride binding isotherm was obtained from one specimen. Experimental results indicated that electrical voltage had a slight effect on the chloride binding isotherm of concrete. Temperature had a positive effect on chloride binding. The higher the water-to-binder ratio was, the higher the chloride binding was.
元强1，DENG Dehua1，SHI Caijun2，De Schutter Geert3
1. School of Civil Engineering, Central South University2. College of Civil Engineering, Hunan University3. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University
摘 要：Chloride binding is often described by chloride binding isotherm, which is closely related to the service life of concrete structures in chloride environments. Many methods have been proposed to determine chloride binding isotherm. Compared to other methods, chloride binding isotherms obtained directly from non-steady-state diffusion tests seem closer to the reality. We studied the chloride binding isotherm from both non-steady-state electrical-accelerated migration and diffusion tests at different temperatures. Twelve concrete mixes with different supplementary cementing materials and water-to-binder ratios of 0.35, 0.48 and 0.6 were cast for study. The specimens after diffusion （or migration） tests were sliced layer by layer, and acid-soluble and free chloride contents of each layer were measured. A chloride binding isotherm was obtained from one specimen. Experimental results indicated that electrical voltage had a slight effect on the chloride binding isotherm of concrete. Temperature had a positive effect on chloride binding. The higher the water-to-binder ratio was, the higher the chloride binding was.
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