Behavior and modeling of post-heated circular concrete specimens repaired with fiber-reinforced polymer composites

2021 ◽  
pp. 136943322110585
Author(s):  
Seyed Mehrdad Elhamnike ◽  
Rasoul Abbaszadeh ◽  
Vahid Razavinasab ◽  
Hadi Ziaadiny
Keyword(s):  
Strain Curve ◽  
Concrete Columns ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Stress Strain Curve ◽  
Stress Strain ◽  
Concrete Members ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

Exposure of buildings to fire is one of the unexpected events during the life of the structure. The heat from the fire can reduce the strength of structural members, and these damaged members need to be strengthened. Repair and strengthening of concrete members by fiber-reinforced polymer (FRP) composites has been one of the most popular methods in recent years and can be used in fire-damaged concrete members. In this paper, in order to provide further data and information about the behavior of post-heated circular concrete columns confined with FRP composites, 30 cylindrical concrete specimens were prepared and subjected under four exposure temperatures of 300, 500, 700, and 900. Then, specimens were repaired by carbon fiber reinforced polymer composites and tested under axial compression. Results indicate that heating causes the color change, cracks, and weight loss of concrete. Also, with the increase of heating temperature, the shape of stress–strain curve of FRP-retrofitted specimens will change. Therefore, the main parts of the stress–strain curve such as ultimate stress and strain and the elastic modulus will change. Thus, a new stress–strain model is proposed for post-heated circular concrete columns confined by FRP composites. Results indicate that the proposed model is in a good agreement with the experimental data.

The Mechanical Property of Recycled Fiber Reinforced Polymer Composites by Superheated Steam

2013 ◽  
Vol 339 ◽  
pp. 687-690 ◽  
Author(s):  
Jian Shi ◽  
Jun Kato ◽  
Li Min Bao ◽  
Kiyoshi Kemmochi
Keyword(s):  
Superheated Steam ◽  
Weight Ratio ◽  
Fiber Reinforced Polymer ◽  
Resin Matrix ◽  
Fiber Reinforced ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Recycled Fiber ◽  
Reinforcement Fiber

Fiber Reinforced Polymer (FRP) composites are used in many applications for their excellent strength-to-weight ratio. These properties are significant barriers for achieving the 3R concept (Recycle, Reuse, and Reduce). Inverse manufacturing is a recent technology that produces new materials and industrial goods from FRP waste based on life-cycle assessment (LCA), and it is expected to help solve the problems of 3R associated with FRP [1-. However, no effective recycling system of FRP has been established because of the cross-linked structure of thermosetting resin matrix and inorganic reinforcement fibers. To investigate the possibility of recycling and reusing both matrix and reinforcements, a project of preventing environmental deterioration was performed. In this study, a new decomposition method for recycling FRP waste by superheated steam was developed. Separation of the resin matrix and reinforcement fiber from the FRP was attempted, the FRP recycled from the separated fibers was remolded; this is called R-FRP.

Experimental Study on Axial Compression of FRP Confined Concrete Column

2012 ◽  
Vol 461 ◽  
pp. 682-685
Author(s):  
Yang Yang Han ◽  
Hao Zhang ◽  
Ya Qin Li ◽  
Jia Yao ◽  
Xiao Ping Hu
Keyword(s):  
Cross Section ◽  
Concrete Columns ◽  
Fiber Reinforced Polymer ◽  
Confined Concrete ◽  
Carbon Fiber Reinforced Polymer ◽  
Strengthening Effect ◽  
Fiber Reinforced ◽  
Concrete Members ◽  
Construction Methods ◽  
Reinforced Polymer

Abstract: Concrete members strengthened by fiber reinforced polymer (FRP) are increasingly becoming a popular retrofit technique in recent years due to the excellent material properties, convenient and easy construction methods, and outstanding strengthening effect. However, fundamental researches are incomplete; especially the characteristics research of square cross-section of FRP confined concrete has become a major obstacle for the development of further research and application. Therefore, the better understanding of the behavior of confined concrete becomes of paramount importance. A total of 10 concrete columns, which were reinforced with CFRP (carbon fiber reinforced polymer) and with filleted square sections, were fabricated and tested subjected to axial load to investigate the mechanical properties of FRP confined concrete. The mechanical behavior of FRP confined concrete has been further understood and some useful conclusions are obtained.

The self-healing investigations on fiber-reinforced polymer composites through a novel compartmented microcapillary approach

2021 ◽  
pp. 096739112098574
Author(s):  
Deepak Jain ◽  
Aviral Gupta ◽  
Sumit Mahajan
Keyword(s):  
Polymer Composites ◽  
Fiber Reinforced Polymer ◽  
Self Healing ◽  
Fiber Reinforced ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Potential Applications ◽  
Healing Agent ◽  
Flexural Tests

This paper presents the experimental self-healing investigations on fiber-reinforced polymer (FRP) composites using a novel in-situ healing approach. During the preparation of polymer composites, the monomer Dicyclopentadiene (DCPD) was embedded as the healing agent. The compartment hollow glass microcapillaries were used to serve the localized distribution of the healing agent. To determine the viability of the proposed microcapillary approach, several flexural tests were conducted to initiate the damage and subsequent realization of self-repair activity. The healing was initiated through the polymerization of DCPD in the presence of Grubb’s catalyst (first and second generation). Once healed, the specimens were tested cyclically to evaluate the recovery of flexural strength. A post-failure healing efficiency as high as 72% has been observed. SEM and XRD investigations have been conducted for the microstructural investigations. These investigations support the potential applications of the proposed concept of embedding the bulk with the microcapillaries.

scholarly journals Durability of Externally Bonded Fiber-Reinforced Polymer Composites in Concrete Structures: A Critical Review

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 765
Author(s):  
Jovan Tatar ◽  
Sandra Milev
Keyword(s):  
Polymer Composites ◽  
Critical Review ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Interdisciplinary Approaches ◽  
Externally Bonded

Externally bonded fiber-reinforced polymer composites have been in use in civil infrastructure for decades, but their long-term performance is still difficult to predict due to many knowledge gaps in the understanding of degradation mechanisms. This paper summarizes critical durability issues associated with the application of fiber-reinforced polymer (FRP) composites for rehabilitation of concrete structures. A variety of factors that affect the longevity of FRP composites are discussed: installation, quality control, material selection, and environmental conditions. Critical review of design approaches currently used in various international design guidelines is presented to identify potential opportunities for refinement of design guidance with respect to durability. Interdisciplinary approaches that combine materials science and structural engineering are recognized as having potential to develop composites with improved durability.

Behavior of Large-Scale Circular and Square RC Columns Confined with Carbon Fiber-Reinforced Polymer under Uniaxial Compression

2010 ◽  
Vol 163-167 ◽  
pp. 3686-3693
Author(s):  
Zhen Yu Wang ◽  
Dai Yu Wang ◽  
Da Gang Lu
Keyword(s):  
Carbon Fiber ◽  
Large Scale ◽  
Axial Stress ◽  
Concrete Columns ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Stress Strain ◽  
Rc Columns ◽  
Reinforced Polymer

Most experimental studies concerning the stress-strain behavior of concrete columns confined with carbon fiber-reinforced polymer (CFRP) focused on plain concrete columns with small section. In this study, 34 concrete columns with large-scale circular and square cross section confined with CFRP were tested under axial compression to investigate the influence of sectional dimensions, internal steel reinforcement and thickness of CFRP jackets on the stress-strain behaviors. Test results indicated that the confinement of CFRP resulted in significant increase in axial stress and strain for circular RC columns, while remarkable enhancement in axial strain but slightly in axial stress for square RC columns. The stress-strain responses of CFRP-confined square RC columns were significantly influenced by sectional dimensions and internal transverse reinforcement. The typical confinement ratio, which is obtained from studies on CFRP-confined unreinforced concrete columns with small cross sections, was not applicable for the case of large-scale square RC columns.

scholarly journals Review of Strain Rate Effects of Fiber-Reinforced Polymer Composites

Polymers ◽  
2021 ◽  
Vol 13 (17) ◽  
pp. 2839
Author(s):  
Lulu Ma ◽  
Feng Liu ◽  
Dongyu Liu ◽  
Yaolu Liu
Keyword(s):  
Strain Rate ◽  
Numerical Models ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Strain Rate Effects ◽  
Frp Composites ◽  
Rate Dependent ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Rate Effects

The application of fiber-reinforced polymer (FRP) composites is gaining increasing popularity in impact-resistant devices, automotives, biomedical devices and aircraft structures due to their high strength-to-weight ratios and their potential for impact energy absorption. Impact-induced high loading rates can result in significant changes of mechanical properties (e.g., elastic modulus and strength) before strain softening occurs and failure characteristics inside the strain localization zone (e.g., failure mechanisms and fracture energy) for fiber-reinforced polymer composites. In general, these phenomena are called the strain rate effects. The underlying mechanisms of the observed rate-dependent deformation and failure of composites take place among multiple length and time scales. The contributing mechanisms can be roughly classified as: the viscosity of composite constituents (polymer, fiber and interfaces), the rate-dependency of the fracture mechanisms, the inertia effects, the thermomechanical dissipation and the characteristic fracture time. Numerical models, including the viscosity type of constitutive models, rate-dependent cohesive zone models, enriched equation of motion and thermomechanical numerical models, are useful for a better understanding of these contributing factors of strain rate effects of FRP composites.

The Novel Electroless Plating Process for Enhancing Coating Adhesion Strength

2015 ◽  
Vol 1119 ◽  
pp. 379-382
Author(s):  
Rui Yang ◽  
Hua Feng Guo ◽  
Shi Yong Sun ◽  
Jan Han ◽  
Ling Bing Xing
Keyword(s):  
Adhesion Strength ◽  
Electroless Plating ◽  
Fiber Reinforced Polymer ◽  
Acid Activation ◽  
Fiber Reinforced ◽  
Coating Adhesion ◽  
Frp Composites ◽  
Pull Out ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

Metallization of Fiber-Reinforced Polymer (FRP) composites aggrandized their application to aircraft, automobile, and wind power industries. However, their application is impeded by insufficient coating adhesion strength. In order to enhance coating adhesion strength between metal coating and fiber-reinforced polymer composites substrate, a new electroless-electrolytic plating process is proposed. The plating process of composite includes the preparation composite specimens with interlayer, micro-roughening, decreasing, acid activation, electroless plating and electroplating. The coating adhesion strength was measured by pull-out test.

scholarly journals Biomass-derived monomers for performance-differentiated fiber reinforced polymer composites

2017 ◽  
Vol 19 (12) ◽  
pp. 2812-2825 ◽  
Author(s):  
Nicholas A. Rorrer ◽  
Derek R. Vardon ◽  
John R. Dorgan ◽  
Erica J. Gjersing ◽  
Gregg T. Beckham
Keyword(s):  
Polymer Composites ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Frp Composites ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

Nearly all polymer resins used to manufacture critically important fiber reinforced polymer (FRP) composites are petroleum sourced.

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