Abstract
This study focuses on the effect generated by a compressive load, in the range 15%–60% of the ultimate load (Fu), in the chloride penetration rate of cement-based materials. The modifications produced in the microstructure influence the transport properties, and, thus, the validation of several interesting parameters, such as, the load value and the loading time, including both static and dynamic loading modes, was evaluated. This analysis was performed by impedance spectroscopy (IS), a non-destructive technique that allowed, after the appropriate modeling analysis, the assessment of the resistivity of the sample, a parameter that has been correlated to the diffusion coefficient in a previous investigation. The experimental arrangement was designed to allow the recording of the impedance spectra under the effect of a compressive load and, thus, the real-time monitoring of the chloride diffusivity was provided. An increase in the diffusion coefficient was verified for a load at 60%Fu whereas no variations were obtained for the load fixed at 30%. A relevant difference could be checked if the values were measured once the load was removed, showing the importance of the precise loading stage for the chloride diffusion study.
Highlights
A review by Yao el al. has summarized the importance of the combined action of both mechanical and environmental factors to assess the durability of concrete structures [1]
A methodology to determine the chloride diffusion coefficients under the influence of a compressive stress is presented in this study
According to the obtained results, the microstructural modifications detected during the loading tests point to a direct correlation between the chloride diffusivity and the specific loading stage
Summary
A review by Yao el al. has summarized the importance of the combined action of both mechanical and environmental factors to assess the durability of concrete structures [1]. Has summarized the importance of the combined action of both mechanical and environmental factors to assess the durability of concrete structures [1]. The review points, in general, to an accelerated mechanical degradation as well as to an increase in the aggressive species penetration. The service life of the reinforced concrete structures could be reduced. For the particular situation of the chloride penetration ability under the influence of a service load, there is no generalized conclusion on the cooperative effect produced by both factors. The diverse tested stress levels along with the different methodologies followed in these investigations, in both the experimental setup and the chloride diffusivity assessment, seem to be the reason for such a discrepancy in the results
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