Article
Construction & Building Technology
Carlos N. Morales, Guillermo Claure, Alvaro Ruiz Emparanza, Antonio Nanni
Summary: This experimental study investigated the durability performance of unstressed glass fiber-reinforced polymer bars embedded in seawater concrete. The study found that the tensile strength was the most affected property by environmental conditioning. The long-term prediction of tensile strength capacity was 92% under typical field exposure conditions and 72% under more aggressive conditions.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Brahim Benmokrane, Salaheldin Mousa, Khaled Mohamed, Mahmoud Sayed-Ahmed
Summary: This paper presents the results of an investigation into the use of newly developed thermoplastic-based glass fiber-reinforced polymer (GFRP) bars as reinforcement in concrete structures. The study found that thermoplastic-based GFRP bars exhibit good mechanical behavior and high long-term durability performance, making them superior to thermoset-based GFRP bars.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Tuanjie Wang, Abdul Ghani Razaqpur, Shaoliang Chen
Summary: By studying the durability of glass fiber and basalt fiber reinforced polymer materials in different solutions, it was found that BFRP is less affected by solution (b), while the opposite is true for GFRP. The components in the solutions cause the dissolution of epoxy resin and leaching of iron ions from basalt fibers. Overall, GFRP exhibits better durability than BFRP.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Zhongyu Lu, Shixin Li, Jianhe Xie, Quanmeng Huang, Baifa Zhang, Peiyan Huang, Jianglin Li, Lijuan Li
Summary: Using prestressed glass fibre-reinforced polymer (GFRP) bars in offshore engineering structures can improve the utilization of GFRP and natural resources. This study investigated the durability of SSC-coated GFRP bars under the coupling effect of prestressing and immersion in seawater at different temperatures. The results showed that SSC wrapping was not conducive to the long-term performance of GFRP bars, and the prestress accelerated the tensile strength degradation. However, the shear properties degraded more slowly than the tensile properties, indicating that the glass fibers were more heavily damaged than the epoxy vinyl resin under prestressing.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Chemistry, Physical
Arnaud Rolland, Karim Benzarti, Marc Quiertant, Sylvain Chataigner
Summary: This study investigates the durability and bond properties of glass fiber-reinforced polymer rebars in concrete through accelerated aging tests and bond tests. The results show that direct immersion conditions lead to severe alkali-attack on the rebars, while the interlaminar shear strength under indirect immersion conditions remains relatively stable. Bond strength initially increases before decreasing over aging, possibly due to interfacial degradation. Additional characterizations using SEM, DSC, and FTIR spectroscopy were conducted to evaluate the effects of aging on the physical properties of GFRPs.
Article
Construction & Building Technology
Nafiseh Kiani, Antonio Nanni
Summary: This study demonstrates that using swaged steel couplers can achieve comparable tensile strength to traditional methods for connecting Glass Fiber Reinforced Polymer (GFRP) bars. The experimental results show that spliced GFRP bars can achieve approximately 97% of the guaranteed tensile strength as per ASTM D7957 when a 102 mm long low-carbon steel coupler is used and a pressure less than 20 MPa is applied for swaging.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Peng Zhu, Zongyang Li, Yunming Zhu, Yuching Wu, Wenjun Qu
Summary: The durability of two types of widely used glass fiber reinforced polymer (GFRP) bars, one without coating and one with slightly surface sand-coating was studied through accelerated aging. Different exposure temperatures and exposure times were investigated. The degradation rate of the tensile strength retentions of the two types of GFRP bars decreased with an increase in the exposure time at all exposure temperatures. Based on the degradation mechanism, a new model was proposed as the best one to predict the residual tensile strength of the GFRP bars. The sand-coating had some effect on the activation energy of the GFRP bars.
Article
Construction & Building Technology
Weiwei Wu, Xiongjun He, Wenrui Yang, Li Dai, Yingang Wang, Jia He
Summary: This study investigates the long-term durability of GFRP bars under different environments, establishes a prediction model, proposes improvements, and evaluates the residual tensile strength of GFRP bars after 8 years of exposure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
De -Yang Kong, J. Y. Richard Liew, Shan Li
Summary: This paper describes an analytical approach for predicting the force-displacement characteristics of deformed reinforcing bars embedded in concrete blocks. The proposed approach provides a more accurate and simpler description of the non-uniform local behavior of the bars, allowing for variations in embedment length, lateral restraints, and failure modes. It is verified using published reinforcing bar pull-out tests and can be used to establish component-based joint models for composite beam-column subassemblies under progressive collapse scenarios.
ENGINEERING STRUCTURES
(2023)
Article
Construction & Building Technology
Zike Wang, Kang Wang, Jun Zhao, Shuaibin Wang, Eskinder Desta Shumuye, Zhaohui Yang
Summary: This study found that the geopolymer concrete cover can effectively reduce the tensile strength loss of GFRP bars after high temperature exposure and has a significant delaying effect within a certain temperature range. In addition, the analysis of the degradation mechanism of GFRP bars and the contribution ratio of each factor to the residual tensile strength provide important references for improving the fire resistance performance of concrete structures.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Mechanics
Zhongyu Lu, Lizhu Su, Jiawei Lai, Jianhe Xie, Bing Yuan
Summary: FRP bars are a green alternative to steel in marine concrete structures due to their resistance to chloride ions, but they can degrade in the strong alkaline environment of concrete. The addition of fly ash in concrete can improve the bond strength between basalt FRP bars and concrete, mitigating the negative effects of degradation on the long-term performance of the structures.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Hamidreza Kazemi, Mohammad Yekrangnia, Milad Shakiba, Milad Bazli, Asghar Vatani Oskouei
Summary: This experimental study investigated the bond-slip durability of glass fibre reinforced polymer (GFRP) and steel bars embedded in seawater concrete. The results showed that seawater and wet-dry cycles had minimal effects on the bond strength of steel bars, but had some impact on GFRP.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
S. Spagnuolo, C. Giorgi, Z. Rinaldi, L. Pedrocco
Summary: This paper discusses the feasibility of replacing traditional steel strands with new composite GFRP bars for prestressing precast HPC sheet piles. The use of prestressing combined with composite reinforcing bars can be a good solution in cases where design focuses on durability, structural lightness, speed of execution, sustainability, and economic savings. Full-scale experimental tests on sheet piles are carried out at the University of Rome Tor Vergata's laboratory to evaluate the potential and feasibility of the proposed technique. A suitable design and check procedure is also applied and discussed.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Decebal Michaud, Amir Fam, Marc-Andre Dagenais
Summary: This study evaluated the development length of sand-coated glass fiber reinforced polymer bars in ultra-high performance concrete. The bond strength was higher in UHPC with steel fibers, increasing with fiber content but decreasing with embedment length. Consequently, the development length in UHPC with steel fibers was smaller and decreased with increasing fiber content.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Tuanjie Wang, Abdul Ghani Razaqpur, Shaoliang Chen
Summary: Glass fiber-reinforced polymer (GFRP) and carbon fiber-reinforced polymer (CFRP) bars were tested for their durability after immersion in CSAC pore solution. Sea salt increased the degradation of both bars, but had a greater impact on GFRP. The tensile strength reduction of GFRP was 56.9%, while that of CFRP was 15.1%. According to ASTM standards, CFRP bars met the alkaline resistance requirement in CSAC pore solution with and without salt, whereas GFRP bars did not meet the same requirement in the solution with salt.
