Chloride Transport in Concrete under Flexural Loads in a Tidal Environment
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 11
Abstract
A long-term exposure test of reinforced concrete (RC) beams with different flexural loads in a tidal environment has been conducted by taking the influence of time-dependent chloride diffusivity into consideration. According to the calculated apparent chloride diffusion coefficients, a chloride transport model under the coupling stresses at different depths and chloride action was established. Results indicated that the influence of flexural loads on free chloride concentrations and apparent chloride diffusion coefficients was obvious in tensile concrete zones. However, it was not a simple inhibition in compressive concrete zones. When the flexural load is less than 30% of the ultimate bearing capacity (), its effect on apparent chloride diffusion coefficients in concrete is slight. However, when 45%–60% is exerted, a critical compressive stress can be detected. After exceeding the critical compressive stress, the chloride transport in concrete will be accelerated. Moreover, when the flexural load reaches 60% , the critical compressive stress of accelerating chloride transport, which is 5.848 MPa, that is, 20% of the cubic compressive strength (), appears.
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Acknowledgments
The authors acknowledge and appreciate support received from the Research Fund for the Natural Science Foundation of Zhejiang Province (LY17E090007, LQ18G010007, and LY13E090008) and the National Natural Science Foundation of China (50879079 and 51279181).
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©2018 American Society of Civil Engineers.
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Received: Nov 23, 2017
Accepted: May 3, 2018
Published online: Aug 14, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 14, 2019
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