Abstract
Basalt fiber reinforced polymer (BFRP) rebars reinforced coral aggregate concrete is a new type of concrete used in ocean engineering. In order to investigate the bond performance between BFRP rebars and coral concrete, 30 pull-out tests were carried out in 10 groups with different diameters of BFRP rebars, bonding lengths and strength of the coral concrete. The results show that good bonding between BFRP rebars and coral concrete were achieved. The main failure modes can be categorized as BFRP rebars pull out destruction, splitting failure of coral concrete and BFRP rebars fracture. The bond slip (tau{text{-}}s) curves of the BFRP rebars and coral concrete were obtained during the tests. It was found to be similar to the common concrete using fiber reinforced polymer (FRP) bars. The bond-slip relation can be roughly divided into micro-slip phase, slip phase, decline phase, and the residual stress stage. The bond between BFRP rebars and coral concrete increases with the increase of the bond length and diameter of BFRP rebars, but the average bond stress will decrease. Moreover, increasing the strength of coral concrete is effective to improve the bond performance of BFRP rebars. In this paper, the continuous bond slip model (Gao et al. in J Zhengzhou Univ 23:1–5, 2002) was used to represent the tau{text{-}}s constitutive relationship of BFRP rebars and coral concrete. The analysis show that the proposed model has a high degree of accuracy in representing tau{text{-}}s curve of BFRP rebars and coral concrete.
Highlights
Under the trend of economic globalization and the vigorous development of marine construction around the world, marine projects such as cross-sea bridges, port terminals and island construction have ushered in a new wave of construction
Wang et al Int J Concr Struct Mater (2019) 13:52 showed that when the strength of concrete is less than 15 MPa, the bond between fiber reinforced polymer (FRP) and concrete is determined by the strength of concrete,when the strength of concrete is greater than 30 MPa, the bond strength of FRP is determined by the strength of FRP rebars
In 2007, Xue et al (2007) tested the bond properties of Glass Fiber Reinforced Polymer (GFRP) bars and concrete with sticky sand, the results show that the bond strength decreases with the increase of the rib diameter and bond length
Summary
Under the trend of economic globalization and the vigorous development of marine construction around the world, marine projects such as cross-sea bridges, port terminals and island construction have ushered in a new wave of construction. In 2007, Xue et al (2007) tested the bond properties of Glass Fiber Reinforced Polymer (GFRP) bars and concrete with sticky sand, the results show that the bond strength decreases with the increase of the rib diameter and bond length. Studies have shown that basalt fiber reinforced polymer (BFRP) bars are the best anti-seawater corrosion FRP products (Dong et al 2016; Altalmas and El Refai 2015), whether it can replace the conventional steel bar to solve the its durability problem depends on its bond strength to coral concrete. Specimens are denoted in term of Bd-l-c, in which D denotes the diameter of BFRP bars, l denotes the bond length, C denotes the strength grade of coral concrete. The absolute slip value of the free end of the BFRP bar is measured by placing electronic dial gauge 1 at the center point of the free end of the BFRP bar; electronic dial gauge 2 measures
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