Abstract
This study investigated the effective chloride diffusion coefficient of cement mortar with different water-to-cement ratio (w/c) under electrical accelerated migration measurement. The cumulative chloride concentration in anode cell solution and the cumulative chloride concentration drop in the cathode cell solution was measured by RCT measurement and the results were further used to calculate the chloride diffusion coefficient by Nordtest Build 355 method and Truc method. The influence of w/c on cement mortar’s chloride coefficient was investigated and the chloride diffusion coefficient under different determination methods were compared with other researchers’ work, a good consistency between this work’s results and literatures’ results was obtained. The results indicated that the increased w/c of cement mortar samples will have a higher chloride diffusion coefficient. The cumulative chloride concentration drop in the cathode cell solution will have deviation in early stage measurement (before 60 h) which will result in overestimation of the effective chloride diffusion coefficient.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
Nordtest Build 355 [18] adopted the electrical accelerated chloride migration measurement and the effective chloride diffusion coefficient (Da ) can be calculated by measuring the cumulative anode chloride concentration as in Equation (3) which is derived from Equation (2) [19]
The chloride ion concentration in anode cell and cathode cell were measured periodically by a rapid chloride test (RCT) measurement, the error of the measurement was less than 5%, and the measurement was calibrated by 5.0 × 10−4 and 5.0 × 10−3 M NaCl solution, respectively, the reliability of the RCT measurement in this work could be found in our companion work [25]
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. In electrical accelerated chloride diffusion measurement, the chloride ions will be transported from cathode cell to anode cell under electrical field. Nordtest Build 355 [18] adopted the electrical accelerated chloride migration measurement and the effective chloride diffusion coefficient (Da ) can be calculated by measuring the cumulative anode chloride concentration as in Equation (3) which is derived from Equation (2) [19]. Proposed that the chloride concentration drop in cathode cell can be used to calculate the effective chloride diffusion coefficient since the chloride will penetrate into the sample at the beginning of the test and the chloride ion concentration flux in anode cell is constant and independent of the interaction between chloride ion and samples [21].
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