Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effect of initial curing on chloride diffusion in concrete repair materials
This paper presents the results of an experimental investigation on the effect of initial curing on chloride diffusion in three generic repair materials and a concrete mix of similar grade. Two field conditions of initial curing were simulated as follows: (1) exposure to a chloride environment after 24 h of casting to simulate repair situations, for example in the tidal zone of marine structures where repairs cannot be protected from tidal exposure for long periods; and (2) 28 days of curing at 20 degree C, 55% relative humidity to simulate field conditions where the repair patches are exposed to the ambient environment without any prolonged protected curing. For comparison purposes identical specimens were cured in water at 20 degree C for 28 days before exposure to the chloride environment. Chloride concentration profiles in the materials were determined after 28, 90, and 180 days of exposure. Regression analysis of the experimental data was carried out applying Fick's second law of diffusion to determine the diffusion coefficients (DC) and chloride concentration on the surface (C0). Based on the results obtained, an analytical expression for the long-term prediction of chloride concentration in repair materials is given. The results show a high rate of chloride diffusion in the cementitious repair materials containing polymer latex additives relative to plain concrete. The effect of inadequate initial curing on chloride penetration (e.g., exposure to chlorides after 24 h of casting or 28-day air curing) is more pronounced in concrete mixes than in generic repair materials.
Effect of initial curing on chloride diffusion in concrete repair materials
This paper presents the results of an experimental investigation on the effect of initial curing on chloride diffusion in three generic repair materials and a concrete mix of similar grade. Two field conditions of initial curing were simulated as follows: (1) exposure to a chloride environment after 24 h of casting to simulate repair situations, for example in the tidal zone of marine structures where repairs cannot be protected from tidal exposure for long periods; and (2) 28 days of curing at 20 degree C, 55% relative humidity to simulate field conditions where the repair patches are exposed to the ambient environment without any prolonged protected curing. For comparison purposes identical specimens were cured in water at 20 degree C for 28 days before exposure to the chloride environment. Chloride concentration profiles in the materials were determined after 28, 90, and 180 days of exposure. Regression analysis of the experimental data was carried out applying Fick's second law of diffusion to determine the diffusion coefficients (DC) and chloride concentration on the surface (C0). Based on the results obtained, an analytical expression for the long-term prediction of chloride concentration in repair materials is given. The results show a high rate of chloride diffusion in the cementitious repair materials containing polymer latex additives relative to plain concrete. The effect of inadequate initial curing on chloride penetration (e.g., exposure to chlorides after 24 h of casting or 28-day air curing) is more pronounced in concrete mixes than in generic repair materials.
Effect of initial curing on chloride diffusion in concrete repair materials
Mangat, P.S. (Autor:in) / Limbachiya, M.C. (Autor:in)
Cement and Concrete Research ; 29 ; 1475-1485
1999
11 Seiten, 17 Quellen
Aufsatz (Zeitschrift)
Englisch
PAPERS - Effect of initial curing on chloride diffusion in concrete repair materials
| Online Contents | 1999
| British Library Online Contents | 1999
Effect of Curing on Early Chloride Diffusion of Filler Cement Concrete
| British Library Conference Proceedings | 1999
Chloride profiles in concrete repair materials
| British Library Conference Proceedings | 1997
Sea Sand Concrete Chloride Ion Diffusion and Combination of Curing
| Tema Archiv | 2012