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Title |
Evaluation of Fracture Energy for Concrete Interfaces Formed Before Initial Setting depending on Elapsed Time to Meet New Concrete Layer
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Authors |
박상민(Sangmin Park) ; 김경진(Kyeongjin Kim) ; 김우석(WooSeok Kim) ; 정유석(Yoseok Jeong) ; 이재하(Jaeha Lee) |
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DOI |
https://doi.org/10.4334/JKCI.2017.29.5.471 |
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Keywords |
콘크리트 접합면 ; 적층콘크리트 ; 파괴에너지 ; 부착강도 ; 초결 concrete interface ; layered concrete ; fracture energy ; bond strength ; initial setting |
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Abstract |
In this study, the material properties such as fracture energy and bond strength of the layered concrete surfaces formed before initial setting were evaluated by performing three-point notched beam tests. Three point notched beam test is low speed Crack-Mouth-Opening-Displacement (CMOD) control test. Based on obtained results, fracture energy of interface between two layers diminished when elapsed time to meet a new layer increased. For one hour of elapsed time to meet new layer, approximately 73 % reduction of fracture energy was observed. Furthermore, it was confirmed that superimposed load from the accumulated layers increase the fracture energy of interface between two layers. In this study, procedures for performing fracture toughness test (fracture energy) was also summarized. It is expected that obtained results from this study could be applied to estimate the layered concrete constructed by 3D printing technology.
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