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Title |
Flexural Performance of Multi-layered Fiber-reinforced Cement Composites with Diverse Interface Shape
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Authors |
권기성(Ki-Seong Kwon) ; 방진욱(Jin-Wook Bang) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.4334/JKCI.2018.30.4.429 |
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Keywords |
생체모방 ; 섬유보강 시멘트 복합체 ; 휨강도 ; 에너지흡수능력 biomimetic ; fiber-reinforced ; flexural strength ; energy absorption capacity |
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Abstract |
In this experimental study, the biomimetic structure shape of crustacean shells was applied as a method to improve the energy absorption capacity of fiber-reinforced cement composites. Three types of precast panels with different surface shape were used to fabricate multi-layered flexural specimens. Flexural test was performed to evaluate the flexural behavior and energy absorption capacity of specimens. Prior to the flexural test, direct tensile tests were performed to evaluate the tensile behavior of the composites. Tensile test results shows that the tensile strength and the average tensile strain capacity was 5.31 MPa and 3.89 %, respectively. As a result of flexural tests, the initial cracking strength of the multi-layered specimens (3.6 to 4.1 MPa) showed similar performances to the plain specimen (3.9 MPa). The maximum flexural strengths of all specimens were ranged from 8.5 to 9.2 MPa, which showed a maximum of 8 % difference insignificantly. As a result of evaluating the energy absorption capacity, the energy absorption capacity of the multi-layered flexural specimens up to 1.78 times higher compared with Plain specimen. The energy absorption capacity increases further when the interface is waveform (Type-W specimen) or unevenly rough (Type-R pecimen). This result indicate that the reflection crack is more suppressed and more micro cracks are generated in Type-W and Type-R specimen compared to others. This is most likely because delamination, sliding and interlocking are occurred due to the complicated interface shape.
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