Bond Behaviors between Ribbed BFRP Bars and Ecological High Ductility Cementitious Composites
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pISSN 1226-7988, eISSN 1976-3808 www.springer.com/12205
DOI 10.1007/s12205-020-2124-5
Structural Engineering
Bond Behaviors between Ribbed BFRP Bars and Ecological High Ductility Cementitious Composites Lijuan Chaia, Liping Guoa,b,c, Bo Chend, and Jiandong Wua a
School of Materials Science and Engineering, Southeast University, Nanjing 211189, China Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China c Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing 211189, China d State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China b
ARTICLE HISTORY
ABSTRACT
Received 21 November 2019 Revised 24 February 2020 Accepted 4 June 2020 Published Online 4 September 2020
Direct pull-out method was conducted to explore the bond stress-slip response of ribbed basalt fiber reinforced polymer (BFRP) bars embedded in ecological high ductility cementitious composites (Eco-HDCCs). The effects of the embedment length and cover thickness on the bond properties between Eco-HDCCs and the bars were described. Results indicate that the failure characteristics of the specimens depend on the embedment length and cover thickness of the BFRP bars. As the embedment lengths of the bars increase, the ultimate bond stress decreases while the ultimate slip increases. Besides, both the ultimate bond stress and ultimate slip show an increasing trend if the specimen has a cover thickness of less than 45 mm, while the increasing trend is slower if the specimen has a cover thickness of more than 45 mm. In addition, the strain of the specimen surface depends on the cover thickness, and the strain increases when the cover thickness is in a range of 15 mm − 35 mm. Moreover, certain embedment lengths and cover thicknesses of the BFRP bars are recommended in the structural design of bridge deck link slabs. The bond stress-slip relationship models of the BFRP bars in Eco-HDCCs are proposed based on the test results.
KEYWORDS Ecological high ductility cementitious composites (Eco-HDCCs) BFRP bar Bond stress-slip relationship Embedment length Cover thickness
1. Introduction Bridge deck link slabs can be used as a substitute for traditional expansion joints. The tensile deformation of the link slab is a key factor to be considered during design. In addition, the crack width should be controlled with the aim of minimizing water or harmful ion leakage (Chai et al., 2018b; Ogura et al., 2019). High ductility cementitious composites (HDCCs) have an excellent property in the aspects of average ultimate tensile strain (more than 0.5%) and average crack width (less than 200 μm) (JC/T 2461, 2018). HDCCs have been applied to bridge deck link slabs due to their excellent tensile deformation performance and self-controlled crack width, and the results monitored in situ indicate that the properties of HDCC remain consistent with the design requirements (Michael and Li, 2009). Bridge structures are exposed to the environment, and the durabil
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