염해손상을 입은 철근콘크리트 구조물의 내구성 증진을 위한 하부대단면 보강공법 = Strengthening Method of the Lower Cross-Section for Increase durability of the Reinforced Concrete Structures with Chloride Damage

다국어 초록 (Multilingual Abstract)

This paper deals with the strengthening method for the Increase durability of the reinforced concrete structures with Chloride Damage, and the purpose of this research is to develop the construction method and materials for extending the lower cross-section of the structures which is set up on the sea. Accordingly, a reinforced concrete pier, which has serious damage at the lower cross-section, is adopted as the subject structure for the study. In the cases of repairing or extending the lower cross-section for the structural reinforcement like the matter in this study, the most important component of choosing an method is the adhesion between the boundary sides of the existing and new concrete, and as the operation is taken on the sea, the material and method, which suit to the ocean surroundings and operating condition, should be chosen.
The structural properties and operation condition taken into consideration, the material, which causes far less pollutant and have much better adhesion and strength, is developed, and with this material, this study indicates the best strengthening method to minimize the amount of rebound and to prevent the joints from breaking out. The lower cross-section extension work of the subject is executed with the newly-developed material and the method for strengthening, and as a result of the quality inspection, the material and method prove their superiority since the compression, ultimate and adhesion strength of the concrete was huge, and the adhesion between the glass fiber and the section extended is great.
As the material and the strengthening method developed in this study bring about little possibilities of polluting the ocean, make it easy to operate on the sea, and have great adhesion not only between the existing and new concrete but also among each mortar layers, they are considered to be very suit to strengthening and extension of the reinforced concrete structure set up on the sea.