Article
Construction & Building Technology
Yishuo Huang, Ming -Gin Lee, Yu-Cheng Kan, Wei -Chien Wang, Yung-Chih Wang, Wei -Bang Pan
Summary: This study explores the retrofitting of reinforced concrete beams with ultra-high-performance concrete (UHPC) or carbon fiber-reinforced polymer (CFRP). The results show that UHPC increases the ultimate load of the beams by 35% and their displacement by 26.8 mm, making it a better choice in terms of toughness and economic benefits.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Engineering, Civil
M. Talha Junaid, Abdul Saboor Karzad, Abdalla Elbana, Salah Altoubat
Summary: This paper presents an experimental investigation into the shear behavior of Glass Fiber Reinforced Polymer (GFRP) reinforced concrete beams. It also examines the effectiveness of shear strengthening using externally-bonded Carbon Fiber Reinforced Polymer (EB-CFRP) sheets and investigates the possibility of interaction between internal and externally bonded shear reinforcement. The results show that GFRP is a viable reinforcement for different types of concrete, and EB-CFRP proves to be a feasible strengthening technique. The difference in shear strength gain between different arrangements of EB-CFRP may indicate interaction between internal and external shear reinforcement.
Article
Polymer Science
Weiping He, Xu Li, Piao Li, Shirui Fang, Anxin Ding
Summary: This study examines the hygroscopic behavior of vinylester resin and high strength glass fiber reinforced vinylester resin composites. The results show that the embedment of glass fiber effectively inhibits the moisture absorption and hydrolysis of the resin matrix. The mechanical properties test reveals a decrease in tensile and compressive strength with increasing immersion time.
Review
Construction & Building Technology
Dehui Wang, Qingnan Gong, Qiang Yuan, Surong Luo
Summary: The degradation of FRP bars in SWSSC is primarily influenced by water molecules, hydroxide ions, and chloride ions, with high temperature and stress also accelerating the degradation process. The presence of chloride ions can accelerate the hydration of cement, improving the early-age properties of SWSSC.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Mechanics
Lili Hu, Peng Feng
Summary: The use of PS CFRP technology effectively enhances the buckling resistance of steel columns. Axial and eccentric compression tests were conducted under different conditions, analyzing the buckling capacity and failure modes, and further establishing a model of the buckling mechanism.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Sachin Paul, Ravindra Gettu, Dali Naidu Arnepalli, Ramakrishna Samanthula
Summary: This paper investigates the long-term mechanical performance of textile reinforced concrete and its relationship with fiber coatings, and compares the reduction in tensile strength of composites under different conditions. The study shows that the type and extent of fiber coatings significantly affect the strength retention of the composites.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Muazzam Ghous Sohail, Muhammad Wasee, Nasser Al Nuaimi, Wael Alnahhal, Mohammad K. Hassan
Summary: This study investigates the effectiveness of the impressed current technique on laboratory-scale RC beams and evaluates the behavior of severely corroded beams rehabilitated with carbon fiber-reinforced polymers (CFRP) and the hybrid of CFRP and glass-FRP (GFRP) laminates. The study found that a desired degree of corrosion could be achieved with the impressed current technique and that CFRP and CFRP-GFRP laminates are effective external strengthening techniques for rehabilitating degraded concrete infrastructure.
ENGINEERING STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Xiao Qi, Jingwei Tian, Rui Guo, Guijun Xian
Summary: This study systematically analyzed the effects of hydrothermal aging on the properties of CFRP rods. It was found that elevated temperature and humidity accelerated water absorption and led to degradation in tensile strength, three-point bending strength, and short-beam shear strength. The most significant degradation occurred in the environment with alternating temperatures. The long-term effects of water molecules caused resin hydrolysis and debonding of the fiber-matrix interface, resulting in degradation in three-point bending and short-beam shear strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Sardar Atta Ur Rehman Khan, M. Neaz Sheikh, Muhammad N. S. Hadi
Summary: This study investigated the feasibility of using CFRP tube ties in high-strength concrete square columns and compared its performance with traditional steel reinforcement systems. The experimental results showed that the use of CFRP tube ties improved the axial and flexural performance of the columns.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2022)
Article
Materials Science, Multidisciplinary
Yongcheng Ji, Yail J. Kim, Yanmin Jia
Summary: This study investigates the durability performance of concrete subjected to sulfuric acid exposure. The absorption of sulfuric acid leads to a decrease in concrete mass, with CFRP layer improving the integrity of the concrete. Changes in microstructure and mechanical properties of concrete after sulfuric acid treatment, as well as the bonding performance of CFRP, are observed. The exposure period affects the deterioration and mechanical properties of concrete and CFRP interface bonding characteristics.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Composites
Yang Hua, Fei Li, Ning Hu, Shao-Yun Fu
Summary: This study demonstrates that grafting graphene oxide (GO) coating onto glass fibers can greatly improve the frictional stability and reduce the friction coefficient parallel to the fiber alignment under low pressures in glass fiber reinforced polymer (GFRP) composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hui Li Lye, Bashar S. Mohammed, Mohamed Mubarak Abdul Wahab, Mohd Shahir Liew
Summary: This study investigates the bond relationship of CFRP-strengthened steel plates exposed to different service temperatures. The results show that the tensile strength is significantly affected by the service temperature, while the flexural strength is less impacted. Experimental data was used to develop reliable models for estimating the strength of the CFRP-strengthened steel plates.
Article
Mechanics
Dongdong Chen, Xiaoyu Sun, Shoune Xiao, Guangwu Yang, Bing Yang, Tao Zhu, Mingmeng Wang
Summary: This study investigated the energy-absorbing mechanisms of composite structures subjected to quasistatic and dynamic axial crushing loads. Double hat-shaped composite tubes made of CFRP and GFRP were tested and analyzed. Results showed that the CFRP structures had reduced energy absorption at higher loading rates, while the GFRP structures remained relatively constant. A finite element model considering strain rate effects accurately predicted the crushing behavior. Mechanical properties of the composite materials played a critical role in the distinct responses of CFRP and GFRP structures. The findings contribute to the crashworthiness design of composite energy-absorbing structures.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Nihat Kabay, Bahadur Amed
Summary: The study investigated the effects of incorporating fly ash, slag, and acrylic polymer on the properties of glass fiber-reinforced concrete (GFRC), showing improvements in workability, flexural strength, and deformation capability. Mechanical properties experienced significant reductions after wet-dry cycles and exposure to high temperature, indicating that high-temperature exposure may offer rapid predictions for long-term GFRC degradation.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Polymer Science
Petr P. Polskoy, Dmitry Mailyan, Alexey N. Beskopylny, Besarion Meskhi, Aleksandr V. Shilov, Artur Umarov
Summary: Many studies focus on using polymer composite materials to increase the strength and stability of concrete elements. This study aimed to increase the strength and stiffness of compressed reinforced concrete elements reinforced with composite materials, and compared the bearing capacity of ten different combinations of reinforcement. The results showed that using composite materials can increase the bearing capacity by up to 41% and the stiffness by up to 30%. Recommendations were proposed for improving the calculation method for inflexible columns reinforced in the transverse direction, taking into consideration the three-dimensional stress state of concrete.
Article
Materials Science, Paper & Wood
Roberta Motta Neves, Heitor Luiz Ornaghi Jr, Fillip Cortat Alves, Ademir Jose Zattera, Milanta Tom, Hiran Mayookh Lal, Arya Uthaman, Sabu Thomas
Summary: The study focuses on the influence of silane-functionalized microcrystalline cellulose (MCC-Si) on the creep and stress relaxation behavior of MCC-epoxy composites. The results show that MCC-Si effectively improves the interfacial adhesion and enhances the creep and stress relaxation resistance at the glassy region. However, this effect is not observed at higher temperatures.
Article
Engineering, Civil
Rui Guo, Chenggao Li, Guijun Xian
Summary: This study investigates the performance changes and degradation mechanism of fiber reinforced polymer (FRP) composite rod under hygrothermal aging conditions. The results reveal that water absorption and diffusion behavior follows a two-stage model, and resin plasticization and interfacial debonding are the main factors contributing to performance degradation.
ENGINEERING STRUCTURES
(2023)
Article
Polymer Science
Jingwei Tian, Chenggao Li, Xiao Qi, Guijun Xian
Summary: In this study, the hygrothermal aging behavior of multi-fillers reinforced epoxy composites (MFREC) was investigated through immersion experiments in different water environments. It was found that the moisture uptake and mechanical properties of MFREC were significantly influenced by the hygrothermal aging, with lower moisture uptake in saline water and a larger decrease in strength and glass transition temperature. Furthermore, the long-term life prediction of MFREC as coatings in different bridge environments was conducted, showing different strength retentions and an additional degradation in the southern environment.
EUROPEAN POLYMER JOURNAL
(2023)
Article
Engineering, Mechanical
Jingwei Tian, Xiao Qi, Chenggao Li, Guijun Xian
Summary: In this study, multi-fillers reinforced epoxy composites (MFREC) were prepared and analyzed to investigate their mechanical, thermal properties, friction behaviors, and wear mechanisms. The results showed that MFREC exhibited enhanced mechanical properties and reduced friction coefficient with increasing loads and temperatures.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Anni Wang, Xiaogang Liu, Qingrui Yue, Guijun Xian
Summary: Hybrid carbon fiber/flax reinforced polymer composites (HFRPs) are cost-effective materials for structural applications. This study investigated the property evolution of HFRP plates immersed in water at 40 and 70 degrees C for eight weeks. The water uptake and flexural properties of the HFRP samples were analyzed based on hybrid modes and fiber contents. The diffusion coefficient and equilibrium water absorption of HFRPs increased with temperature, and the deterioration of performance was more pronounced. HFRPs with carbon fibers on the surface showed better hydrothermal resistance and lower water absorption compared to other hybrid modes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Mechanics
Zhen Wang, Guijun Xian, Qingrui Yue
Summary: This paper focuses on the CFRP-strengthened steel beam using a ductile adhesive and validates the effectiveness of the trapezoidal CZM. 3-D finite element models were used to simulate the mechanical response and the debonding behavior. The ductile adhesive is shown to be more appropriate due to reduced normal stress, increased mixed-mode fracture energy, and more uniform stress distribution.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Deao Kong, Ping Zhou, Chenggao Li, Bin Hong, Guijun Xian
Summary: This study quantitatively investigated the effects of pipe and crack geometry, CFRP properties, and prestress levels on the Mode I stress intensity factor (SIF) of a prestressed CFRP-wrapped steel pipe with a through-walled crack through dimensional and finite element analysis. The results showed that the SIF was affected by the radius and wall thickness of the pipe, as well as the stiffness of the CFRP and the level of prestress. An empirical equation for calculating the Mode I SIF in the CFRP-wrapped thin-walled pipe with a through-walled crack was proposed, along with a mechanical method to calculate the decrement of pipe substrate bearing internal pressure caused by prestress.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Polymer Science
Noel Babu, Puxuan Zhang, Guijun Xian
Summary: Traditional surface treatment techniques are often insufficient for maintaining bond durability of adhesively bonded joints. The potential of using tannic acid (TA) as an additive to improve the interfacial bond durability of epoxy adhesives has not been adequately studied. In this study, an additive (TA-AGE) was synthesized and added to the epoxy, resulting in a significant improvement in the single lap shear strength. However, the hydrophilicity and water uptake characteristics of the epoxy were increased, negatively impacting its mechanical properties.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Anni Wang, Xiaogang Liu, Qingrui Yue, Guijun Xian
Summary: This article studied the impact resistance of unidirectional flax fiber and carbon fiber reinforced polymer composite plates. Drop hammer impact and compression after impact (CAI) tests were conducted to investigate the impact response, damage resistance, and impact tolerance. Acoustic emission technology was used to study the internal damage. The expansion of matrix cracks caused by the original impact was analyzed under compressive load in fiber-reinforced polymer composites (FRP).
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Materials Science, Composites
Anni Wang, Peng Yin, Xiaogang Liu, Guijun Xian
Summary: Ramie fiber-reinforced polymer (RFRP) composites were studied under hydrothermal conditions to understand the influence of different resin matrices on their mechanical properties and durability. The study found that RFRP composites reinforced with phenolic resin (RFRPR) had better flexural and short-beam strength, while composites reinforced with unsaturated polyester (RFRUP) had higher water absorption and diffusion coefficients. The erosion of water molecules led to deterioration in the interfacial bonding performance of the RFRPR composite. This study lays the foundation for further promotion and application of RFRP composites.
POLYMER COMPOSITES
(2023)
Review
Materials Science, Composites
Lingyu Tian, Puxuan Zhang, Guijun Xian
Summary: Thermoplastic polymers have advantages over thermosetting resins as fiber reinforced composite matrices, but their high viscosity poses a challenge to processability. Low viscosity in situ polymerizable thermoplastic resins are considered a cost-effective solution. This paper provides an overview of the engineering, high-performance, room-temperature-processible liquid methyl methacrylate (MMA) resins and their composites. It reviews the polymerization behavior and initiators, discusses the pultrusion process and modeling, presents the mechanical properties and durability of fiber-reinforced MMA-matrix composites, and identifies challenges in their preparation and application.
POLYMER COMPOSITES
(2023)
Article
Polymer Science
Noel Babu, Puxuan Zhang, Maleck Massou, Chenggao Li, Guijun Xian
Summary: This study investigates the potential of a tannic acid-based additive to enhance the interfacial bond durability of underwater structural epoxy adhesive. The modified epoxy, M(Ep.), was prepared by incorporating 1% (optimized) TA-AGE additive into the epoxy. The incorporation of TA-AGE additive improved the underwater adhesion by strengthening the interfacial bonds through noncovalent interactions.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Materials Science, Composites
Deao Kong, Jiajun Shi, Shaoce Dong, Chenggao Li, Bin Hong, Guijun Xian
Summary: The hygrothermal resistance of 48K and 12K carbon fibers and their CFRPs immersed in deionized water at different temperatures was analyzed and compared. The immersion caused the sizing agent on the carbon fiber surface to debond or hydrolyze, resulting in changes in the tensile strength, dispersion, and surface activity of the carbon fibers. The performance of the CFRPs was influenced by factors such as the dispersion of the fibers, surface activity, and obstructing effect on water diffusion.
POLYMER COMPOSITES
(2023)
Review
Materials Science, Multidisciplinary
Xiao Qi, Jingwei Tian, Guijun Xian
Summary: In this paper, the hydrothermal ageing of CFRPs is comprehensively summarized, including water uptake process, property degradation, and prediction models. The different stages of ageing are characterized by the evolution of mechanical properties. The three typical model methods for life prediction of CFRPs are compared in terms of accuracy, applicability, reliability, precision, practicality, environmental factors, and degradation mechanisms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Civil
Maleck Massou, Noel Babu, Guijun Xian
Summary: This study examines the effects of seawater immersion at different temperatures on the degradation and viscoelastic behavior of carbon fiber-reinforced polymer (CFRP) composite plates. The results show that immersion in seawater significantly reduces the interlaminar shear strength (ILSS) of CFRP plates, particularly at higher temperatures and longer immersion times. However, the overall tensile properties are minimally affected. Dynamic mechanical analysis reveals a decrease in damping, indicating a reduction in fiber-matrix adhesion. Long-term life prediction suggests that CFRP plates subjected to seawater immersion are susceptible to degradation, with a stable retention of 70% of the interlaminar shear strength in the composite laminate.
