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Title |
Crack Control of Flexure-Dominant Reinforced Concrete Beams Repaired with Strain-Hardening Cement Composite (SHCC) Materials
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Authors |
차준호 ; 박완신 ; 이영오 ; 김선우 ; 윤현도 |
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Keywords |
변형경화형 시멘트 복합체(SHCC) ; 철근콘크리트 보 ; 균열제어성능 ; 내구성 strain-hardening cement composite(SHCC) ; reinforced concrete beam ; controled crack control ; durability |
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Abstract |
This paper presents an experimental study results on the crack control of flexure-dominant reinforced concrete beams repaired with strain-hardening cement composite (SHCC). Five RC beams were fabricated and tested until failure. One unrepaired RC beam was a control specimen (CBN) and remaining four speciemens were repaired with SHCC materials. The test parameters included two types of SHCC matrix ductility and two types of repair method (patching and layering). Test results demonstrated that RC beams repaired with SHCC showed no concrete crushing or spalling until final failure, but numerous hair cracks were observed. The control specimen CBN failed due to crushing. It is important to note that SHCC matrix can improve crack-damage mitigation and flexural behavior of RC beams such as flexural strength, post peak ductility, and energy dissipation capacity. In the perspective of crack width, crack widths in RC beams repaired with SHCC had far smaller crack width than the control specimen CBN under the same deflection. Especially, the specimens repaired with SHCC of PVA0.75%+PE0.75% showed a high durability and ductility. The crack width indicates the residual capacity of the beam since SHCC matrix can delay residual capacity degradation of the RC beams.
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