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Title |
Evaluation of Flexural Bond Performance of Hybrid Concrete Repair Materials
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Authors |
김경태(Gyeong Tae Kim) ; 김상준(Sang Jun Kim) ; 박홍기(Hong Gi Park) ; 최영철(Young Cheol Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.6.176 |
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Keywords |
보수재료 ; 부착성능 ; 건조수축 ; 휨부착 ; 섬유 Repair material ; Adhesion ; Drying shrinkage ; Flexural bond |
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Abstract |
Concrete structures are degraded physically and chemically due to various reasons after construction. Because the deterioration of concrete structure reduces the service life, reasonable repair and maintenance techniques are needed. Recently, in order to efficiently repair concrete structures, many researches on hybrid repair materials having improved adhesion performance have been carried out actively. In this study, we developed a hybrid repair material containing rapid hardening cement, PVA powder, nylon fiber, and latex to improve adhesion and water-tightness of existing concrete. The compressive strength, drying shrinkage and the adhesion strength test were carried out to evaluate the performance of the repair material. In addition, the flexure bond performance was evaluated before and after repair. From the results, the bending strength was 110% ~ 150% in all specimens except for the specimen containing only the rapid hardening cement, and all the specimens behaved with the existing concrete in the crack pattern generated by the bending strength.
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