Title: Effect of Curing Conditions on Bond Behavior between Carbon Fiber-Reinforced Polymer and Concrete

Author(s): Er-yu Zhu and Ze-wen Zhu

Publication: Materials Journal

Volume: 116

Issue: 6

Appears on pages(s): 5-18

Keywords: bond behavior; curing temperature; curing time; local bond-slip model; monorail; near-surface-mounted carbon fiber-reinforced polymer (NSM CFRP) strip

DOI: 10.14359/51719148

Date: 11/1/2019

Abstract:
A total of 16 pullout specimens were tested to investigate the effect of curing conditions on bond behavior of near-surface-mounted (NSM) carbon fiber-reinforced polymer (CFRP) strengthening concrete under curing temperatures from 35 to 65°C (95 to 149°F) and curing times from 6 to 12 hours. It was compared to that of specimens in ambient conditions (16°C [60.8°F]). On these bases, a nonlinear local bond-slip model was proposed. Two key parameters—A and B—are employed in the proposed bond-slip model, the specific expressions of which were mainly related to ultimate pullout load and peak shear stress of the specimen. The results show that the bond behavior of CFRP strip represents a negative quadratic curve with curing temperature and positive inverse tangent curves with curing time, respectively. The nonlinear local bond-slip model, considering the curing temperature-time, is deduced and validated.