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Polymers 2018, 10(1), 66; doi:10.3390/polym10010066

Assessing the Contribution of the CFRP Strip of Bearing the Applied Load Using Near-Surface Mounted Strengthening Technique with Innovative High-Strength Self-Compacting Cementitious Adhesive (IHSSC-CA)

1
Centre for Sustainable Infrastructure, Faculty of Science, Engineering and Technology, Swinburne University of Technology, P.O. Box 218, Melbourne, VIC 3122, Australia
2
Department of Civil and Construction Engineering, Faculty of Science, Engineering and Technology, Swinburne University of Technology, P.O. Box 218, Melbourne, VIC 3122, Australia
*
Author to whom correspondence should be addressed.
Received: 7 December 2017 / Revised: 8 January 2018 / Accepted: 9 January 2018 / Published: 11 January 2018
(This article belongs to the Special Issue Selected Papers from "SMAR 2017")
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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 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. View Full-Text
Keywords: CFRP strips; near-surface mounted; cementitious adhesive; pull-out test; concrete CFRP strips; near-surface mounted; cementitious adhesive; pull-out test; concrete
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Mohammed, A.; Al-Saadi, N.T.K.; Al-Mahaidi, R. Assessing the Contribution of the CFRP Strip of Bearing the Applied Load Using Near-Surface Mounted Strengthening Technique with Innovative High-Strength Self-Compacting Cementitious Adhesive (IHSSC-CA). Polymers 2018, 10, 66.

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