Publication: Investigation of the effects of connectors to enhance bond strength of externally bonded steel plates and CFRP laminates with concrete
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Date
2016
Authors
Jabbar A.S.A.
Alam M.A.
Mustapha K.N.
Journal Title
Journal ISSN
Volume Title
Publisher
Techno Press
Abstract
Steel plates and carbon-fiber-reinforced polymer (CFRP) laminates or plates bonded to concrete substrates have been widely used for concrete strengthening. However, this technique cause plate debonding, which makes the strengthening system inefficient. The main objective of this study is to enhance the bond strength of externally bonded steel plates and CFRP laminates to the concrete surface by proposing new embedded adhesive and steel connectors. The effects of these new embedded connectors were investigated through the tests on 36 prism specimens. Parameters such as interfacial shear stress, fracture energy and the maximum strains in plates were also determined in this study and compared with the maximum value of debonding stresses using a relevant failure criterion by means of pullout test. The study indicates that the interfacial bond strength between the externally bonded plates and concrete can be increased remarkably by using these connectors. The investigation verifies that steel connectors increase the shear bond strength by 48% compared to 38% for the adhesive connectors. Thus, steel connectors are more effective than adhesive connectors in increasing shear bond strength. Results also show that the use of double connectors significantly increases interfacial shear stress and decrease debonding failure. Finally, a new proposed formula is modified to predict the maximum bond strength of steel plates and CFRP laminates adhesively glued to concrete in the presence of the embedded connectors. Copyright � 2016 Techno-Press, Ltd.
Description
Bond strength (materials); Carbon; Carbon fiber reinforced plastics; Concretes; Connectors (structural); Elasticity; Fiber reinforced plastics; Fracture; Laminates; Reinforced concrete; Shear stress; Steel fibers; Strengthening (metal); Carbon fiber reinforced polymer; Concrete strengthening; Externally bonded plates; Interfacial bond strength; Interfacial shear stress; Shear bond strengths; Steel plates; Strengthening systems; Debonding