Concrete Substrate Preparation and Characterization Prior to Adhesion of Externally Bonded Resuborcement


The bond between externally bonded FRP resuborcement and concrete substrate is highly dependent on the quality of the surface preparation. Accordingly, accurate measurement of surface roughness could lead to the more reliable and predictable bond behavior. This paper presents the results of an experimental study aimed at investigating the effect of surface preparation on bond performance of externally applied resuborcement other than FRP. Water jetting was used as the abrading method. The quantitative assessment of surface roughness was conducted using a newly-developed laser profilometer. Samples of externally applied steel resuborced polymer (SRP) and steel resuborced grout (SRG) resuborcement were pull-off tested. Comparison to the state-of-the-art surface characterization method using plastic concrete surface profiles was undertaken, yielding a relationship between the roughness of the concrete surfaces and the roughness of the plastic models. Experimental results of this project showed that the effect of the surface roughness on the pull-off strength of the externally applied SRP and SRG resuborcement was not a key factor. This was because in the first instance failure always occurred in the concrete substrate, while in the latter it occurred in the gout layer.

Meeting Name

International Symposium on Bond Behaviour of FRP in Structures (2005: Dec. 7-9, Hong Kong)


Mining Engineering

Second Department

Geosciences and Geological and Petroleum Engineering

Third Department

Civil, Architectural and Environmental Engineering

Keywords and Phrases

Bond strength; Concrete surface profiles (CSP); Laser profilometer; Pull-off test; Steel reinforced grout (SRG); Steel reinforced polymer (SRP); Surface roughness; Concrete beams and girders; Concrete reinforcements; Grouting; Mortar; Profilometry; Reinforced plastics; Reinforcement

International Standard Book Number (ISBN)


Document Type

Article - Conference proceedings

Document Version


File Type





© 2005 International Institute for FRC in Construction, All rights reserved.

Publication Date

01 Dec 2005

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