Mechanical behavior and durability of coral aggregate concrete and bonding performance with fiber-reinforced polymer (FRP) bars: A critical review

Zhou, Linlin; Guo, Shuaicheng; Zhang, Zuhua; Shi, Caijun; Jin, Zuquan; Zhu, Deju

doi:10.1016/j.jclepro.2020.125652

Cited by 89 publications

(14 citation statements)

References 72 publications

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“…Currently, FRP bars have gained wide acceptance as an ideal alternative to traditional reinforcement for pavements or structures subjected to harsh environments (Liu et al, 2020; Zhang et al, 2017). However, previous studies (Bazli et al, 2020b; Wang et al, 2018b; Zhou et al, 2021b) have indicated that FRP bars are not entirely immune to marine environments with high temperature, high humidity, and high salinity, and still exhibit a trend of performance deterioration after exposure to these harsh environments. Wang et al (2018b) found that the ultimate bond stress of GFRP and CFRP bars embedded in coral concrete decreased by approximately 54% and 17%, respectively, when the specimens were soaked in seawater at 60°C for 120 days.…”

Section: Introductionmentioning

confidence: 95%

Utilizing alkali-activated materials as ordinary Portland cement replacement to study the bond performance of fiber-reinforced polymer bars in seawater sea-sand concrete

Cao

Bai

Wang

et al. 2022

Advances in Structural Engineering

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Alkali-activated materials (AAMs) are considered an eco-friendly alternative to ordinary Portland cement (OPC) for mitigating greenhouse-gas emissions and enabling efficient waste recycling. In this paper, an innovative seawater sea-sand concrete (SWSSC), that is, seawater sea-sand alkali-activated concrete (SWSSAAC), was developed using AAMs instead of OPC to explore the application of marine resources and to improve the durability of conventional SWSSC structures. Then, three types of fiber-reinforced polymer (FRP) bars, that is, basalt-FRP, glass-FRP, and carbon-FRP bars, were selected to investigate their bond behavior with SWSSAAC at different alkaline dosages (3%, 4%, and 6% Na2O contents). The experimental results manifested that the utilization of the alkali-activated binders can increase the splitting tensile strength ( ft) of the concrete due to the denser microstructures of AAMs than OPC pastes. This improved characteristic was helpful in enhancing the bond performance of FRP bars, especially the slope of bond-slip curves in the ascending section (i.e., bond stiffness). Approximately three times enhancement in terms of the initial bond rigidity was achieved with SWSSAAC compared to SWSSC at the same concrete strength. Furthermore, compared with the BFRP and GFRP bars, the specimens reinforced with the CFRP bars experienced higher bond strength and bond rigidity due to their relatively high tensile strength and elastic modulus. Additionally, significant improvements in initial bond stiffness and bond strength were also observed as the alkaline contents (i.e., concrete strength) of the SWSSAAC were aggrandized, demonstrating the integration of the FRP bars and SWSSAAC is achievable, which contributes to an innovative channel for the development of SWSSC pavements or structures.

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Section: Introductionmentioning

confidence: 95%

Utilizing alkali-activated materials as ordinary Portland cement replacement to study the bond performance of fiber-reinforced polymer bars in seawater sea-sand concrete

Cao

Bai

Wang

et al. 2022

Advances in Structural Engineering

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“…On the other hand, fiber-reinforced polymer (FRP) composites, which possess excellent tensile mechanical properties and durability in harsh environmental conditions [ 29 , 30 , 31 , 32 , 33 , 34 ], have been adopted as reinforcement in various cementitious composites or an external strengthening layer for existing structures [ 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ]. FRPs have been used as reinforcement in various forms in cementitious composites, such as FRP grids or sometimes un-impregnated fiber fabrics such as textiles [ 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 ].…”

Section: Introductionmentioning

confidence: 99%

“…The excellent durability of both FRP grids and UHPC allows the usage of corrosive raw materials for the cementitious mixture [ 11 , 57 ]. For example, seawater and sea-sand can be directly applied in the system to construct coastal and marine infrastructures, thus reducing freshwater, river-sand, and materials transportation costs [ 11 , 27 , 47 , 48 , 49 ]. The FRP grid-UHPC tubular members can also be used for strengthening existing RC columns, if the members are prefabricated in the form of two half pieces of tubes, which should be connected in situ to form a tube to facilitate confinement.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of FRP Grid-Reinforced UHPC Tubular Columns

Zeng

Long

2021

Polymers

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In this study, a novel form of tubular columns that is made of ultra-high-performance concrete (UHPC) internally reinforced with fiber-reinforced polymer (FRP) grid (herein referred to as FRP grid-UHPCtubular column) was developed. The axial compression test results of FRP grid-UHPC tubular columns with and without in-filled concrete are presented and discussed. Effects of the number of the FRP grid-reinforcing cages, the presence of in-filled concrete, and the presence of external FRP confinement were investigated. The test results confirmed that the FRP-UHPC tubular columns have a satisfactory compressive strength, and the strength and ductility of FRP-confined concrete-filled FRP grid-UHPC tube columns are enhanced due to the confinement from the FRP wrap. The proposed FRP grid-reinforced UHPC composite tubes are attractive in structural applications as pipelines or permanent formworks for columns, as well as external jackets (can be prefabricated in the form of two halves of tubes) for strengthening deteriorated reinforced concrete columns.

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“…Enormous amounts of raw materials, such as river sand, gravel, and freshwater, need to be shipped to produce concrete. This is associated with high cost, long period, CO 2 emission, and the consumption of non-renewable energy (Zhou et al, 2021). A sustainable solution is to use locally available materials to produce concrete, such as seawater, sea sand, and coral reefs (Gui et al, 2020;Liu et al, 2020;Wu et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

Guo

et al. 2021

Front. Mater.

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Utilizing coral aggregate concrete (CAC) for construction on remote islands can significantly reduce construction cost and period, CO2 emission, and consumption of non-renewable energy. The durability of reinforced CAC structures is critically influenced by their resistance to chloride attack. In this study, a reactive transport modelling was developed to investigate chloride ingress in CAC, in which a COMSOL-PHREEQC interface based on MATLAB language was established. The experiment from the literature was taken as a benchmark example. The results show that the developed numerical model can accurately predict chloride transport in CAC. Differing from ordinary aggregate concrete (OAC), Kuzel’s salt does not appear in cement hydrate compounds of CAC during chloride ingress. The numerical results indicate that the penetration depth of chloride in CAC gradually increases as the exposure time is prolonged. When CAC is exposed to an external chloride solution, the decrease in the pH of the pore solution affects the precipitation of Friedel’s salt, which is detrimental to the chemical binding of chloride.

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Mechanical behavior and durability of coral aggregate concrete and bonding performance with fiber-reinforced polymer (FRP) bars: A critical review

Cited by 89 publications

References 72 publications

Utilizing alkali-activated materials as ordinary Portland cement replacement to study the bond performance of fiber-reinforced polymer bars in seawater sea-sand concrete

Utilizing alkali-activated materials as ordinary Portland cement replacement to study the bond performance of fiber-reinforced polymer bars in seawater sea-sand concrete

Compressive Behavior of FRP Grid-Reinforced UHPC Tubular Columns

Reactive Transport Modelling of Chloride Ingress in Saturated Coral Aggregate Concrete

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