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논문 기본 정보

자료유형
학술저널
저자정보
Park, Byungkwan (School of Smarty City and Construction Engineering, University of Science and Technology [UST]) Lee, Chulho (School of Smarty City and Construction Engineering, University of Science and Technology [UST]) Choi, Soon-Wook (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) Kang, Tae-Ho (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) Kim, Jintae (Silkroad T&D Co., Ltd.) Choi, Myung-Sik (Silkroad T&D Co., Ltd.) Jeon, Seokwon (Department of Energy Resources Engineering, Seoul National University) Chang, Soo-Ho (School of Smarty City and Construction Engineering, University of Science and Technology [UST])
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제16권 제4호
발행연도
2018.1
수록면
385 - 397 (13page)

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This study evaluates the interfacial properties of composite specimens consisting of shotcrete and sprayed waterproofing membrane. Two different membrane prototypes were first produced and tested for their waterproofing ability. Then composite specimens were prepared and their interfacial properties assessed in direct shear and uniaxial compression tests. The direct shear test showed the peak shear strength and shear stiffness of the composites' interface decreased as the membrane layer became thicker. The shear stiffness, a key input parameter for numerical analysis, was estimated to be 0.32-1.74 GPa/m. Shear stress transfer at the interface between the shotcrete and membrane clearly emerged when measuring peak shear strengths (1-3 MPa) under given normal stress conditions of 0.3-1.5 MPa. The failure mechanism was predominantly shear failure at the interface in most composite specimens, and shear failure in the membranes. The uniaxial compression test yielded normal stiffness values for the composite specimens of 5-24 GPa/m. The composite specimens appeared to fail by the compressive force forming transverse tension cracks, mainly around the shotcrete surface perpendicular to the membrane layer. Even though the composite specimens had strength and stiffness values sufficient for shear stress transfer at the interfaces of the two shotcrete layers and the membrane, the sprayed waterproofing membrane should be as thin as possible whilst ensuring waterproofing so as to obtain higher strength and stiffness at the interface.

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