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Effects of independently designed and prepared self-healing granules on self-healing efficiency for cement cracks
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DOI：10.1016/j.conbuildmat.2022.128626.png)
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Abstract
En 中文
Cement-based materials are prone to cracks, especially in marine environments where aggressive ions accelerate structural damage through cracks. Thus, self-healing techniques are essential to increase the service life of concrete structures. In this study, three types of self-healing granules were designed and prepared, and their characteristics were analyzed. The self-healing efficiency under different conditions was evaluated, and the self -healing mechanism was elucidated. The results indicated that self-healing granules had acceptable water-proofness and were compatible with cement mortar. Additionally, self-healing granules ruptured through their cracks and showed acceptable dispersion. Repair products were produced at cracks after curing. The cracks below 300 mu m were effectively sealed. The area repair rate reached a range of 70 %-90 %, and the relative permeability coefficient decreased to a range of 0.2-0.4 in the presence of self-healing granules. High carbonate source contents in the self-healing granules afforded better self-healing efficiencies. The self-healing efficiency was not significantly different for 7 and 56 d cracks, indicating long-term effectiveness. When cured in seawater, the self-healing rate and efficiency was improved, especially within 3 d. The repair products mainly consist of calcium carbonate and hydrated calcium silicate, as well as magnesium hydroxide in seawater.
Keywords:
Self-healing granules
Area repair ratio
Permeability coefficient
Long-term effectiveness
Complex seawater ions
Journal
IF:
8
Papers:
4.4W
Citations:
27.9W