[논문]Bond performance of NSM CFRP strips embedded in concrete using direct pull-out testing with cementitious adhesive made with graphene oxide

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

doi:10.1016/j.conbuildmat.2017.12.050

Bond performance of NSM CFRP strips embedded in concrete using direct pull-out testing with cementitious adhesive made with graphene oxide

Construction & building materials, v.162, 2018년, pp.523 - 533

Al-Saadi, Nihad Tareq Khshain (Department of Civil and Construction Engineering, Swinburne University of Technology) , Mohammed, Alyaa (Department of Civil and Construction Engineering, Swinburne University of Technology) , Al-Mahaidi, Riadh (Department of Civil and Construction Engineering, Swinburne University of Technology)

Abstract ▼ AI-Helper

Abstract Concrete structures are normally strengthened using fibre reinforced polymer (FRP) with epoxy adhesives and polymer cementitious mortars. Epoxy adhesives have significant issues, such as the release of toxic fumes throughout curing, loss of strength and stiffness when exposed to hot temperatures, and low permeability and weakness to UV radiation. In the case of polymer cementitious adhesives, their properties are adversely affected by hydrothermal conditions. An innovative high-strength self-compacting non-polymer cementitious adhesive (IHSSC-CA) has recently been developed by the authors which uses graphene oxide and cementitious materials. This paper presents the bond response of carbon FRP strips bonded to concrete substrate using near-surface mounted (NSM) technique with IHSSC-CA, epoxy and polymer cement-based adhesives using direct pull-out tests. The behaviour of each adhesive is presented and compared and the local bond-slip relationship is calculated. Finally, an analytical model is proposed to predict the ultimate pull-out force (bond strength). The results of this study confirm the effectiveness of using IHSSC-CA to improve the bond strength, stiffness, CFRP strip utilisation, ductility and residual strength of NSM CFRP system. Moreover, the proposed analytical model can simulate experimental conditions reasonably well. Highlights IHSSC-CA is easier to use for NSM CFRP application than epoxy and polymer cement adhesives. IHSSC-CA shows better composite action with concrete and CFRP than polymer cement and epoxy adhesives. The results confirm the effectiveness of using IHSSC-CA to improve the NSM CFRP technique. An analytical model is proposed to predict the ultimate pull-out force (bond strength).

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Bond performance of NSM CFRP strips embedded in concrete using direct pull-out testing with cementitious adhesive made with graphene oxide

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