Research Interface Failure Features Of CFRP-Concrete Under Hygrothermal Environment By DICM

Inline CFRP strengthened RC structure is a technology development in the field of concrete structures reinforcement. Compared with externally bonded CFRP reinforcement technology, near-surface mounted CFRP reinforcement method have some advantages, such as larger bounding area and CFRP-embedded into the concrete internal can avoid accidental injury from external shocks.This paper considers inline CFRP-concrete bonding reinforcement interface as the object of study, studying the effect rules of bounding interface of NSM-CFRP concrete under hot-wet environment.In order to study the interface properties of NSM-CFRP concrete under hot-wet environment, design 24 samples as experimental program, use the temperature and humidity as variable, use pull-out loading device with patent right designed by our group to conduct drawing test. In this paper, the research contents and conclusions are as follows:(1) explore the effect of ultimate bearing resistance under hot-wet environment, the results showed:compare with under normal temperature and humidity, decreased or increased temperature and humidity can reduce over 10% ultimate bearing capacity of reinforced specimens.(2)explore the hot-wet environment effect on the stress-strain transfer laws, the results showed:when moist heat increases, the stress-strain transfer as fast as possible to free end direction,when the load increases to a certain value, the maximum shear stress continue moving toward the free ends.(3) Study and test bond-slip constitutive model, the results shows that the average correlation coefficient of De Lorenzis model is largest; validation results describing De Lorenzis model average correlation coefficient; the calculated ultimate bearing capacity of Taljsten strength model fit the experiment results and available in this paper with a high degree of accuracy.