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Chloride Diffusion Along the Interface Between Concrete Matrix and Repair Materials Under Flexural Loading by Gongchan Li; Qingsong Zhou; Wei Wang; Chunhao Lu; Chong Chen; Zongkai Guo; Caifeng Lu is a Engineering article available to read on EtoBox.

What is Chloride Diffusion Along the Interface Between Concrete Matrix and Repair Materials Under Flexural Loading about?

The interface will be the weakest part after the rehabilitation of old concrete substrate; however, the durability of the interface has been unclear. To fill this gap, this study designed three typical interfaces to simulate those in field projects, i.e., the concrete-repair concrete interface, the concrete-repair cementitious grout interface, and the concrete-repair cementitious grout interface under flexural loading. An improved salt ponding test and a self-designed loading device for simulating the chloride contamination environment coupled with the loading were proposed. Results showed that as the water to cement ratio (w/c) of concrete decreased, the difference in chloride profile was also reduced in each part of the repair system, which presented no obvious difference when the w/c was 0.4. The chloride ion concentration was distributed in an asymmetric inverted V shape in all cases along the perpendicular direction of the interface. Besides, the influenced area of crack at the interface in the prefabricated concrete substrate was 10–20 mm, while that in the cast-in-place concrete substrate was 5–10 mm, along the direction perpendicular to the interface. The crack widths betwe

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Author

Gongchan Li; Qingsong Zhou; Wei Wang; Chunhao Lu; Chong Chen; Zongkai Guo; Caifeng Lu

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)