Experimental Investigation on the Interface Bonding Performance between CFRP and Masonry under Sulfate Semi-immersion
To investigate the effect of sulphate semi-immersion environment on the interfacial bonding properties of CFRP-masonry,one-sided shear tests were conducted on short columns of reinforced masonry under different erosion days,and the interfacial bonding properties of CFRP-masonry and CFRP-pre-deteriorated masonry were investigated under continuous semi-immersion environment of 10％sodium sulphate solution.The results show that the interfa-cial damage patterns are mainly FRP layer damage,resin-adhesive bond layer damage and brick matrix damage,and the interfacial damage patterns of CFRP-masonry gradually transitioned from FRP layer damage to brick matrix damage with the increase of immersion days,and CFRP-pre-deteriorated masonry gradually transitioned from FRP layer damage to resin-adhesive bond layer damage.The ultimate load carrying capacity and bond strength of the in-terface in the sulphate environment decreased with the increase of the number of half-immersion days,and after 90 d of half-immersion,the ultimate load carrying capacity and bond strength of CFRP-masonry decreased by 24.6％and 43％,respectively,whereas the decrease of CFRP-pre-deteriorated masonry reached the maximum of 65.8％.This suggests that when CFRP is adhered to salt attack deteriorated masonry surfaces,the deteriorated surfaces may be detrimental to the curing process,which in turn affects the bond performance.This study will provide a reference for the use of CFRP to strengthen masonry structures in areas subject to more severe sulphate erosion.
万方数据
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