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Materials 2016, 9(8), 654; doi:10.3390/ma9080654

New Surface-Treatment Technique of Concrete Structures Using Crack Repair Stick with Healing Ingredients

1
International Sustainable Engineering Materials (ISEM) Center, Ceramic Materials Institute & Division of Advanced Materials Science Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-79, Korea
2
Department of Civil Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-79, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Nele De Belie
Received: 28 June 2016 / Revised: 29 July 2016 / Accepted: 1 August 2016 / Published: 4 August 2016
(This article belongs to the Special Issue Self-Healing Concrete)
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Abstract

This study focused on the development of a crack repair stick as a new repair method along with self-healing materials that can be used to easily repair the cracks in a concrete structure at the construction site. In developing this new repair technique, the self-healing efficiency of various cementitious materials was considered. Likewise, a crack repair stick was developed to apply to concrete structures with 0.3 mm or lower crack widths. The crack repair stick was made with different materials, such as cement, an expansive material (C12A7), a swelling material, and calcium carbonate, to endow it with a self-healing property. To verify the performance of the crack repair stick for concrete structures, two types of procedures (field experiment and field absorption test) were carried out. As a result of such procedures, it was concluded that the developed crack repair stick could be used on concrete structures to reduce repair expenses and for the improved workability, usability, and serviceability of such structures. On the other hand, to evaluate the self-healing performance of the crack repair stick, various tests were conducted, such as the relative dynamic modulus of elasticity test, the water tightness test, the water permeability test, observation via a microscope, and scanning electron microscope (SEM) analysis. From the results, it is found that water leakage can be prevented and that the durability of a concrete structure can be improved through self-healing. Also, it was verified that the cracks were perfectly closed after 28 days due to application of the crack repair stick. These results indicate the usability of the crack repair stick for concrete structures, and its self-healing efficiency. View Full-Text
Keywords: autogenous healing; surface treatment; micro-crack; repair materials; water leakage autogenous healing; surface treatment; micro-crack; repair materials; water leakage
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Ahn, T.-H.; Kim, H.-G.; Ryou, J.-S. New Surface-Treatment Technique of Concrete Structures Using Crack Repair Stick with Healing Ingredients. Materials 2016, 9, 654.

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