Bond properties of CFRP-high performance concrete subjected to freeze-thaw cycles
Wang Yutian, Jiang Fuxiang, Zhao Tiejun, Zhang Kai and Yin Yanbo
DOI:10.11835/j.issn.1674-4764.2015.02.014
Received August 06, 2014,Revised , Accepted , Available online June 25, 2015
Volume ,2015,Pages 85-91
- Abstract
By adopting double shear test，the developing law of interface bonding properties between CFRP and high performance concrete exposed to freeze-thaw environment was studied. The damage characteristics，shear strain distribution，the paths of the load-slip curves，adhesive capacity and failure mechanisms of specimens without freeze-thaw damage and with 25，50，100，150，200 and 300 times freeze-thaw cycle effect were compared and analyzed. The results showed that interface damage occurred within the concrete surface layer for all of the specimens，but with the increase of freeze-thaw cycles，destroyed interface had the tendency to the adhesive resins layer. Subjected to less freeze-thaw cycles such as 25 times and 50 times，the interface bond strength，rigidity and cracking load didnot change obviously，even slightly elevated but with the further increase of freeze-thaw cycles，interface bond properties changed obviously. Interfacial bond strength and slippage in the end of CFRP decreasedThe rigidity degeneration and nonlinear characteristics were obvious andthe initial cracking load was lowered. The ultimate bearing capacity and the concrete cube compressive strength both declined after increasing with the growth of the number of freeze-thaw cycles. The change of concrete strength was an important factor for the changes of interfacial bond properties.