Effects of Immersion in Water, Alkaline Solution, and Seawater on the Shear Performance of Basalt FRP Bars in Seawater–Sea Sand Concrete

Author(s):  
Jianhe Xie ◽  
Yongchao Li ◽  
Zhongyu Lu ◽  
Zhihong Fan ◽  
Jianglin Li ◽  
...  
2022 ◽  
pp. 136943322110651
Author(s):  
Ruiming Cao ◽  
Bai Zhang ◽  
Luming Wang ◽  
Jianming Ding ◽  
Xianhua Chen

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.


2018 ◽  
Vol 70 (17) ◽  
pp. 894-904 ◽  
Author(s):  
Zhiqiang Dong ◽  
Gang Wu ◽  
Bo Xu ◽  
Xin Wang ◽  
Luc Taerwe

2020 ◽  
Vol 256 ◽  
pp. 119484 ◽  
Author(s):  
Azzam Ahmed ◽  
Shuaicheng Guo ◽  
Zuhua Zhang ◽  
Caijun Shi ◽  
Deju Zhu

2019 ◽  
Vol 213 ◽  
pp. 32-42 ◽  
Author(s):  
Zhiqiang Dong ◽  
Gang Wu ◽  
Xiao-Ling Zhao ◽  
Hong Zhu ◽  
Xinxing Shao
Keyword(s):  
Sea Sand ◽  

2021 ◽  
Vol 269 ◽  
pp. 121264
Author(s):  
Yingwu Zhou ◽  
Heng Gao ◽  
Zhiheng Hu ◽  
Yadong Qiu ◽  
Menghuan Guo ◽  
...  

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 654 ◽  
Author(s):  
Jiafei Jiang ◽  
Jie Luo ◽  
Jiangtao Yu ◽  
Zhichen Wang

Fiber-reinforced polymer (FRP) has supreme resistance to corrosion and can be designed with optic fibers. FRP can be an alternative to steel reinforcement for concrete structures, and can serve as a sensor for smart concrete structures. Due to poor cracking control and bond performance, the limit of flexural capacity in the serviceability limit state has not been determined, which has obstructed the wider application of FRP bars in smart structures. In this study, in order to overcome these shortcomings, a new engineering cementitious composite (ECC) with superior tensile strain capacity was used to replace the cover around the FRP bars in the tensile zone. To investigate the anti-cracking performance of the new composite beam, seven simply supported beams were designed. In the preliminary investigation, the longitudinal FRP bars in these beams were designed without optic fibers to focus on the mechanical behavior. The beams were tested under four-point load and measured using the digital sensor technique, digital image correlation (DIC). The test results showed that introducing a new ECC layer on the tensile side improves the cracking control and flexural behavior (load capacity and deformability) of a FRP-reinforced sea sand and seawater concrete (SSC) beam, especially in the serviceability limit state. We demonstrate the new composite beam can steadily and fully improve the tensile capacity of FRP bars, which is the basis of using FRP bars as sensors.


2018 ◽  
Vol 192 ◽  
pp. 671-682 ◽  
Author(s):  
Zhiqiang Dong ◽  
Gang Wu ◽  
Xiao-Ling Zhao ◽  
Hong Zhu ◽  
Jin-Long Lian

2021 ◽  
Vol 282 ◽  
pp. 122636
Author(s):  
Bai Zhang ◽  
Hong Zhu ◽  
Ruiming Cao ◽  
Jianming Ding ◽  
Xianhua Chen
Keyword(s):  
Sea Sand ◽  

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