Experimental and analytical study of bond between basalt FRP bars and geopolymer concrete

Trabacchin, Giulia; Sebastian, Wendel; Zhang, Mingzhong

doi:10.1016/j.conbuildmat.2021.125461

Cited by 28 publications

(5 citation statements)

References 54 publications

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“…The bond behavior of FRP bars in concrete is influenced by the adhesive category, 17 FRP bar properties, 18,19 compressive strength of the concrete, 20,21 bond length, 22 and bondline defects. 23 Soliman et al 24 studied the bonding behavior of NSM FRP bars in concrete with different bonding adhesives containing cementitious materials and epoxy.…”

Section: Introductionmentioning

confidence: 99%

Bond performance of NSM FRP–concrete interfaces with epoxy under chloride‐salt conditioned environments

Zhang,

Sun,

Wang

2024

Structural Concrete

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Concrete in coastal areas is susceptible to structural damage caused by corrosion and expansion of reinforcement. Near‐surface mounted (NSM) fiber‐reinforced polymer (FRP) bars have become effective for strengthening damaged reinforced concrete structures. The bonding performance of NSM FRP bars in concrete is a key factor limiting their application and promotion in civil engineering. In this study, the influences of the conditioned environment, such as the chloride salt concentration, immersion time, and bond length of the FRP bar, on the bonding performance were investigated experimentally. First, material properties in a conditioned environment were studied. Subsequently, the failure mode, bond stress–slip curve, and bond strength of the NSM FRP bar in concrete were investigated. Finally, the microstructure and chemical composition of the materials were revealed using scanning electron microscopy and energy‐dispersive spectroscopy (EDS) images of the materials under environmental conditions. The transfer mechanism of NSM FRP bars in concrete with epoxy was revealed. The results showed that the failure modes of the pullout specimens can be divided into epoxy splitting failure and basalt fiber‐reinforced polymer (BFRP) pulling failure. The chloride‐salt concentration was a critical factor affecting the bond properties, and the longer the bond length, the lower the bond strength. The microstructure clearly shows that the degradation of the bonding behavior at the interface of the NSM FRP bar in concrete in a conditioned environment is attributable primarily to the resin damage of the epoxy, resulting in pit corrosion. There was no significant damage to the fibers in the FRP bar, and the degradation was primarily due to resin matrix damage and interfacial debonding. The EDS results showed that the degradation of the epoxy resin and BFRP bars was caused by CO bond and SiO bond fractures, respectively.

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Section: Introductionmentioning

confidence: 99%

Bond performance of NSM FRP–concrete interfaces with epoxy under chloride‐salt conditioned environments

Zhang,

Sun,

Wang

2024

Structural Concrete

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“…Xiong et al [23] paid attention to the bonding behavior between recycled aggregate concrete (RAC) and basalt fiber-reinforced polymer (BFRP) bars, and they found that the bond strength increased with the concrete strength. Trabacchin et al [24] conducted pull-out tests to study the bonding behavior of basalt fiber-reinforced polymer (BFRP) bars in geopolymer concrete (GPC), and they found that the chemical adhesion was low, and the bond was mainly dependent on mechanical interlocking. Ahmed et al [25] carried out pullout tests under monotonic and cyclic loading patterns to examine the effect of cyclic loading on the bonding behavior of BFRP bars, and their results revealed that cyclic loading had a significant effect on the bonding performance of BFRP bars.…”

Section: Introductionmentioning

confidence: 99%

Research on the Bonding Performance of BFRP Bars with Reactive Powder Concrete

Xiao,

Murong,

Chen

et al. 2023

Buildings

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In recent years, replacing steel bars with basalt fiber-reinforced polymer (BFRP) bars and replacing ordinary concrete with reactive powder concrete (RPC) are considered effective solutions to the corrosion problem of steel bars in ordinary reinforced concrete structures. In order to study the bonding performance between BFRP bars and RPC, a total of 27 bonding specimens were tested by pull-out test. The effects of steel fiber volume content (0%, 1.5%, 2%), protective layer thickness (25 mm, 40 mm, 55 mm, 69 mm), and bond anchorage length of bars (3 d, 4 d, 5 d; d is the diameter of the bars) on the bond performance were studied. The experimental results indicated that the BFRP bar and reactive powder (RPC) concrete interface exhibited better bonding performance, and the steel fibers mixed in RPC can play the role of crack-blocking enhancement in the specimen, which improves the shear and tensile properties of the concrete, thus improving the bond strength between BFRP bar and RPC. Three failure modes were observed in the pull-out tests: BFRP bar shear failure, splitting failure, and concrete shear failure. The bond strengths of BFRP bars and RPC with 0%, 1.5%, and 2% steel fiber content were 24.2 MPa, 32.1 MPa, and 34.5 MPa, respectively. With the increase in bond anchorage length, the ultimate bond strength tended to increase first and then decrease. There may be an optimal bonding length between BFRP bar and reactive powder concrete, and when the optimal bonding length is exceeded, the bond strength decreases with the increase in bonding length. With the increase in the protective layer thickness, the improvement in the bond strength of the BFRP bar and RPC was not very significant.

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“…Monti et al [13] proposed a bilinear bond-slip model, which overcame the main defect of the ideal elastic-plastic model as it refected slip softening in a linearly decreasing manner, but it failed to describe the debonding behaviour of the anchoranchorage interface. Trabacchin et al [14] used theories and tests to analyse the bonding behaviour between basalt FRP (fbre-reinforced polymer) bars and concrete and proposed a bilinear bond-slip model. Ren et al [15] considered the residual bond strength and proposed an analytical solution to predict the mechanical properties of a full-length rockbolt during pulling based on the three-length bond-slip model.…”

Section: Introductionmentioning

confidence: 99%

Study on the Load Transfer Behaviour and Bond-Slip Model of Fully Grouted Rockbolt

Yu,

Yang,

Chen

et al. 2023

Shock and Vibration

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Rockbolts are often subjected to loads during service, and the load transfer behaviour of rockbolts is very important. Therefore, in this study, pullout tests were performed on two kinds of rockbolt systems, with and without defects, and the load transfer behaviour and failure modes were analysed. According to the load transfer process between the rockbolt and cement mortar interface, a bond-slip model considering the yield of the rockbolt was proposed, and the nonlinear behaviour in the softening stage was considered. The test results showed that the evolution of the interface load between the rockbolt and cement mortar in the grouted rockbolt systems without defects underwent four stages of gradual failure, namely, elasticity, yield, softening, and complete slip, and its failure mode involved the rockbolt being pulled out accompanied by splitting cracks and tensile cracks on the concrete surface. The proposed bond-slip models considering the nonyielding and yielding of the rockbolt can accurately reflect the actual load transfer behaviour of a fully grouted rockbolt.

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Experimental and analytical study of bond between basalt FRP bars and geopolymer concrete

Cited by 28 publications

References 54 publications

Bond performance of NSM FRP–concrete interfaces with epoxy under chloride‐salt conditioned environments

Bond performance of NSM FRP–concrete interfaces with epoxy under chloride‐salt conditioned environments

Research on the Bonding Performance of BFRP Bars with Reactive Powder Concrete

Study on the Load Transfer Behaviour and Bond-Slip Model of Fully Grouted Rockbolt

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