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http://dx.doi.org/10.14190/JRCR.2021.9.3.383

Evaluation Method of Healing Performance of Self-Healing Materials Based on Equivalent Crack Width  

Lee, Woong-Jong (Research Center, Korea Concrete Institute)
Kim, Hyung-Suk (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University)
Choi, Sung (Department of Civil Engineering, Kyungdong University)
Park, Byung-Sun (Department of Environmental Systems Engineering, Sejong Campus, Korea University)
Lee, Kwang-Myong (Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University)
Publication Information
Journal of the Korean Recycled Construction Resources Institute / v.9, no.3, 2021 , pp. 383-388 More about this Journal
Abstract
In this study, constant head water permeability test was adopted to evaluate self-healing performance of mortars containing inorganic healing materials which consist of blast furnace slag, sodium sulfate and anhydrite. Clinker powder and sand replaced for a part of cement and fine aggregates. On constant head water permeability test for self-healing mortars, unit water flow rate of mortar specimens were measured according to crack width and healing period. As a result of evaluating the healing performance of self-healing mortar, it was confirmed that with the initial crack width of 0.3mm, the healing rate at healing period of 28 days increased by more than 30%p compared to plain mortar, greatly improving the healing performance. Furthermore, the coefficient(α) which was estimated from the relationship between crack width and unit water flow rate was used for calculating equivalent crack width. By analyzing the correlation of healing rate and equivalent crack width, the time and initial crack width attaining healing target crack width were predicted.
Keywords
Self-healing material; Evaluation method of self-healing performance; Constant head water permeability test; Equivalent crack width;
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