[논문]Assessment of bond strength of NSM CFRP strips embedded in concrete using cementitious adhesive made with graphene oxide

Mohammed, Alyaa; Al-Saadi, Nihad Tareq Khshain; Al-Mahaidi, Riadh

doi:10.1016/j.conbuildmat.2017.07.238

Assessment of bond strength of NSM CFRP strips embedded in concrete using cementitious adhesive made with graphene oxide

Construction & building materials, v.154, 2017년, pp.504 - 513

Mohammed, Alyaa (Department of Civil and Construction Engineering, Swinburne University of Technology, PO Box 218, Victoria 3122, Australia) , Al-Saadi, Nihad Tareq Khshain (Department of Civil and Construction Engineering, Swinburne University of Technology, PO Box 218, Victoria 3122, Australia) , Al-Mahaidi, Riadh (Department of Civil and Construction Engineering, Swinburne University of Technology, PO Box 218, Victoria 3122, Australia)

Abstract ▼ AI-Helper

Abstract Efficient transfer of load between concrete substrate and fibre reinforced polymer (FRP) by the bonding agent is the key factor in any FRP strengthening system. An innovative high-strength self-compacting non-polymer cementitious adhesive (IHSSC-CA) was recently developed by the authors and has been used in a number of studies. Graphene oxide and cementitious materials are used to synthesise the new adhesive. The successful implementation of IHSSC-CA significantly increases carbon FRP (CFRP) strip utilization and the load-bearing capacity of the near-surface mounted (NSM) CFRP strengthening system. A number of tests were used to inspect the interfacial zone in the bonding area of NSM CFRP strips, including physical examination, pore structure analysis, and three-dimensional laser profilometery analysis. It was deduced from the physical inspection of NSM CFRP specimens made with IHSSC-CA that a smooth surface for load transfer was found in the CFRP strip without stress concentrations in some local regions. A smooth surface of the adhesive layer is very important for preventing localized brittle failure in the concrete. The pore structure analysis also confirmed that IHSSC-CA has better composite action between NSM CFRP strips and concrete substrate than the other adhesives, resulting in the NSM CFRP specimens made with IHSSC-CA sustaining a greater load. Finally, the results of three-dimensional laser profilometery revealed a greater degree of roughness and less deformation on the surface of the CFRP strip when IHSSC-CA was used, compared to other adhesives. Highlights IHSSC-CA is easier to use during NSM CFRP application than polymer cement and epoxy adhesives. Physical, pore structure and 3D-laser profilometery analysis showed the effectiveness of IHSSC-CA. IHSSC-CA has better composite action between NSM CFRP and concrete than the other adhesives.

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참고문헌 (21)

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Assessment of bond strength of NSM CFRP strips embedded in concrete using cementitious adhesive made with graphene oxide

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