Print Email Facebook Twitter Chloride diffusivity in partially saturated cement-based materials assessed by resistivity measurements Title Chloride diffusivity in partially saturated cement-based materials assessed by resistivity measurements Author Zhang, Y. Ye, G. Faculty Civil Engineering and Geosciences Department Structural Engineering Date 2014-10-15 Abstract Concrete is seldom saturated due to its self-desiccation. Even the submerged concrete structures may remain unsaturated for quite a long time. It has been reported the saturation level of pore solution has significant effect on species penetration. However, very little work was proposed regarding the transport properties and serviceability of concrete structures made of blended cementitious materials. This paper initiated the study of chloride ion diffusion in various blended cement-based system under non-saturated condition by resistivity measurements. Experiments have been performed on mortars made of different cement-based materials (Portland cement, fly ash, blast furnace slag, limestone powder) with different water to binding ratio (w/b=0.4, 0.5, 0.6). The mortar specimens have been curing for 200 days conditioning with 98% RH and 20°C, followed by oven drying at 50°C until the specimens reach different saturation levels from 95% down to 18%. The resistivity measurements for different cement-based systems are performed. The results showed that saturation level has significant effect on the chloride diffusion coefficient. As to the relation between relative diffusivity and water saturation, the effect of w/b is less obvious in system with higher w/b. Compared with FA and LP system, the deepest decrease in relative diffusivity was found in BFS-blended system with the decrease of water saturation level. Subject blended materialsrelative diffusivitynon-saturatedchlorideresistivity To reference this document use: http://resolver.tudelft.nl/uuid:acc7014c-2bee-49d0-b10c-a7f9a31d2e31 Source 3rd International Conference on Service Life Design for Infrastructure, Zhuhai, China, 15-17 Oktober 2014 Part of collection Institutional Repository Document type conference paper Rights (c) 2014 The Author(s) Files PDF 317331.pdf 361.72 KB Close viewer /islandora/object/uuid:acc7014c-2bee-49d0-b10c-a7f9a31d2e31/datastream/OBJ/view