An Anchorage System for Enhanced Bond Behavior between Carbon Fiber Reinforced Polymer Sheets and Cracked Concrete

Abstract

The contribution of CFRP wraps, as an anchorage system, to enhancing bond behavior between CFRP sheet and cracked concrete, was investigated. Thirty six concrete blocks (150 x 150 x 200 mm) were cast with 3ϕ12 mm steel bars embedded laterally at different spacing along the 200-mm-dimension. Half of the moist-cured blocks were subjected to a cyclic treatment in 3% chloride solution until reinforced sides cracked at an average global crack size 0.54 mm; the remaining ones were immersed in a lime solution for a similar period, as controls. Finally, the blocks were attached at their reinforced surface to CFRP sheets at different bond widths and lengths with CFRP wrap anchorages applied over portions where high shearing stresses persist during pull-off testing. The results indicate that the physical status of concrete, the geometry of main CFRP sheets, and the extension of CFRP wrap anchorage are major factors that shape the benefit from the proposed anchorage technique. Empirical models, developed to predict bond strength and slippage at ultimate stress, show very good predictability of literature data.

Environmental Impact on the Behavior of CFRP Sheet Attached to Concrete

“…The rough surface of CFRP showed superior bond strength when compared to the smooth surface of CFRP [4]. The geometry, in terms of length and width, of CFRP is a major factor that shapes the bond strength [5]. The durability of CFRP materials in different environments is one of the primary issues that has limited the development of these materials in the application of some infrastructure [6].…”

Bond Properties of Carbon Fiber Reinforced Polymer and Corrosion-Cracked Reinforced Concrete Interface: Experimental Test and Nonlinear Degenerate Interface Law

“…However, the study of bond behavior between CFRP sheets and corrosion-cracked concrete surface is limited. Haddad et al [ 20 , 21 , 22 ] conducted experiments on this gap and found that corrosion-induced cracking caused a significant reduction in bond strength, slippage at ultimate stress and bond stiffness. However, the design scheme of the specimens in their study did not accurately simulate the actual CFRP strengthening scheme.…”

Interfacial bond-slip relationship between Carbon Fiber Reinforced Polymer Plate and Concrete after High Temperature of Asphalt Paving Construction

“…Roughness parameter was introduced and proposed the optimum roughness for the best interface behavior. Haddad (2019) conducted an experimental study on the bonding behavior between CFRP and cracked concrete, 15 pull-off specimens were tested and its test results were analyzed. It indicated that the bonding behavior between CFRP and cracked concrete mainly affected by the concrete status, CFRP plate shape and anchorage measure.…”