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Experiment on Bond Performance of CFRP Bars in Seawater and Sea Sand Concrete(PDF)


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Experiment on Bond Performance of CFRP Bars in Seawater and Sea Sand Concrete
SHAN Bo12 TONG Guang-quan1 LIU Qi-yuan1
1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, Hunan University, Changsha 410082, Hunan, China
CFRP bar seawater and sea sand concrete pullout test bond strength
In order to study the bond performance of fiber reinforced polymer(FRP)bars in seawater and sea sand concrete(SWSSC), 72 specimens were made from four kinds of carbon fiber reinforced plastic(CFRP)bars and two strength grades of SWSSC. The effects of bonding length, reinforcement diameter, concrete strength and reinforcement surface treatment on bond performance were studied. The comparative tests of SWSSC specimens and normal concrete(NC)specimens were carried out, and the failure modes and bond stress-slip curves of SWSSC specimens were obtained. Based on the test results, a modified ACI 440.1R-06 method was proposed for predicting bond strength of CFRP bars with SWSSC. The results show that the bond failure modes of CFRP bars and SWSSC can be divided into pull-out failure and splitting failure; the bond strength gradually decreases with the increase of bond length, and has an approximate relationship with(ld/db)-0.41(ld is the bond length, db is the diameter of CFRP bars). The bond strength increases as increasing of the compressive strength of SWSSC, while it is slightly influenced by the diameter of CFRP bars. The surface treatment of CFRP bar with coated by sand significantly improved the bond properties of CFRP bars with SWSSC. The bond enhancement factor could be taken as 1.76 in current study. Compared with NC, the bond strength between CFRP and SWSSC is slightly reduced; the error between the predicted results and the test results is large, which is not suitable for directly estimating the tensile strength of CFRP bars and SWSSC; based on ACI 440.1R-06 and CSA S806-02, the pull-out strength of CFRP bars and SWSSC cannot be directly estimated. The calculation results of the new bond strength formula proposed by ACI 440.1R-06 are in good agreement with the test results, however, the applicability of the method needs to be further investigated.


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Last Update: 2020-10-15