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http://dx.doi.org/10.14190/JRCR.2021.9.3.375

Development of Oxygen Diffusion Test Method for Crack Width Evaluation of Self-Healing Concrete  

Lee, Do-Keun (Department of Civil Engineering, Chungnam University)
Shin, Kyung-Joon (Department of Civil Engineering, Chungnam University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.3, 2021 , pp. 375-382 More about this Journal
Abstract
Self-healing concrete is in the spotlight in that it can effectively extend the lifespan of concrete structures by healing cracks in the structure by themselves without additional repairing or retrofiting actions. Currently, self-healing concrete is a field that is being actively studied around the world, but since most studies focus on the improvement of healing performance, there is a lack of methods to rationally evaluate the self-healing performance of concrete. Although the gas diffusion test method has been developed for the use in the performance evaluation of self-healing concrete, it has revealed that for gas diffusion through the matrix affect the crack diffusion coefficients depending on the environmental conditions such as the saturation of the specimen, the temperature, and humidity during the experiment. Therefore, in this study, the method has been proposed to eliminate the influence of the matrix diffusion when calculating the crack diffusion coefficient. In addition, a pre-conditioning process was introduced to shorten the experimental time. As a result, the crack width could be estimated with an error level of less than 3% in the test time of about 20 minutes.
Keywords
Oxygen diffusion; Crack; Diffusion coefficient;
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