Bond behavior of GFRP bar-concrete interface: Damage evolution assessment and FE simulation implementations

2016 ◽  
Vol 155 ◽  
pp. 63-76 ◽  
Author(s):  
Fei Yan ◽  
Zhibin Lin
Keyword(s):  
Damage Evolution ◽  
Fe Simulation ◽  
Bond Behavior ◽  
Interface Damage ◽  
Gfrp Bar ◽  
Concrete Interface

scholarly journals Experimental Characterization of the FRCM-Concrete Interface Bond Behavior Assisted by Digital Image Correlation

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1154
Author(s):  
Dario De Domenico ◽  
Antonino Quattrocchi ◽  
Damiano Alizzio ◽  
Roberto Montanini ◽  
Santi Urso ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Mechanical Tests ◽  
Image Correlation ◽  
Front Face ◽  
Full Field ◽  
Bond Behavior ◽  
Externally Bonded ◽  
Strengthening Technique ◽  
Concrete Interface

Digital Image Correlation (DIC) provides measurements without disturbing the specimen, which is a major advantage over contact methods. Additionally, DIC techniques provide full-field maps of response quantities like strains and displacements, unlike traditional methods that are limited to a local investigation. In this work, an experimental application of DIC is presented to investigate a problem of relevant interest in the civil engineering field, namely the interface behavior between externally bonded fabric reinforced cementitious mortar (FRCM) sheets and concrete substrate. This represents a widespread strengthening technique of existing reinforced concrete structures, but its effectiveness is strongly related to the bond behavior between composite fabric and underlying concrete. To investigate this phenomenon, a set of notched concrete beams are realized, reinforced with FRCM sheets on the bottom face, subsequently cured in different environmental conditions (humidity and temperature) and finally tested up to failure under three-point bending. Mechanical tests are carried out vis-à-vis DIC measurements using two distinct cameras simultaneously, one focused on the concrete front face and another focused on the FRCM-concrete interface. This experimental setup makes it possible to interpret the mechanical behavior and failure mode of the specimens not only from a traditional macroscopic viewpoint but also under a local perspective concerning the evolution of the strain distribution at the FRCM-concrete interface obtained by DIC in the pre- and postcracking phase.

scholarly journals Steel Corrosion Evaluation of Basalt Fiber RPC Affected by Crack and Steel-Concrete Interface Damage Using Electrochemical Methods

Sensors ◽  
2020 ◽  
Vol 20 (18) ◽  
pp. 5027
Author(s):  
Hanbing Liu ◽  
Xiang Lyu ◽  
Yuwei Zhang ◽  
Guobao Luo ◽  
Wenjun Li
Keyword(s):  
Basalt Fiber ◽  
Steel Corrosion ◽  
Corrosion Process ◽  
Electrochemical Methods ◽  
Reactive Powder Concrete ◽  
Interface Damage ◽  
Steel Bars ◽  
Corrosion Behaviors ◽  
Reactive Powder ◽  
Concrete Interface

Basalt fiber (BF) is a new anti-corrosion and environmentally friendly material, which is expected to delay the corrosion process of steel bars and improve the durability of reinforced reactive powder concrete (RPC). The electrochemical method is a nondestructive testing and real-time monitoring technique used to characterize the corrosion behaviors of steel bars embedded in concrete structures. In this paper, the electrochemical technique was employed to evaluate the corrosion of steel bars embedded in basalt fiber modified reactive powder concrete (BFRPC). Besides, crack and steel-concrete interface damage (SCID) were considered as typical factors that affect steel corrosion in concrete. Thus, both reinforced fiber-free RPC and BFRPC specimens with crack and SCID were prepared for evaluating the steel corrosion behaviors by electrochemical methods. The results revealed that both crack and SCID would aggravate the steel corrosion, and the crack was the major factor that affects the corrosion process. Moreover, the excellent compactness of BFRPC and the bridging action of BF could effectively prevent the concrete cracking and steel corrosion process of concrete. Using reinforced BFRPC instead of ordinary concrete in practical projects could greatly extend the service life of steel bars.

scholarly journals Experimental Study on Bond Behavior of FRP-Concrete Interface in Hygrothermal Environment

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
X. H. Zheng ◽  
P. Y. Huang ◽  
X. Y. Guo ◽  
J. L. Huang
Keyword(s):  
Interface Failure ◽  
Bond Behavior ◽  
Double Shear ◽  
Frp Composite ◽  
Temperature And Humidity ◽  
Carbon Fiber Laminate ◽  
Hygrothermal Environment ◽  
Displacement Transducers ◽  
Longitudinal Strains ◽  
Concrete Interface

As the technique of fiber-reinforced polymer (FRP) composite material strengthened reinforced concrete structures is widely used in the field of civil engineering, durability of the strengthened structures has attracted more attention in recent years. Hygrothermal environment has an adverse effect on the bond behavior of the interface between FRP and concrete. This paper focuses on the bond durability of carbon fiber laminate- (CFL-) concrete interface in hygrothermal condition which simulates the climate characteristic in South China. Twenty 100 mm × 100 mm × 720 mm specimens were divided into 6 groups based on different temperature and humidity. After pretreatment in hygrothermal environment, the specimens were tested using double shear method. Strain gauges bonded along the CFL surface and linear variation displacement transducers (LVDTs) were used to measure longitudinal strains and slip of the interface. Failure mode, ultimate capacity, load-deflection relationship, and relative slip were analyzed. The bond behavior of FRP-concrete interface under hygrothermal environment was studied. Results show that the ultimate bearing capacity of the interface reduced after exposure to hygrothermal environments. The decreasing ranges were up to 27.9% after exposure at high temperature and humidity (60°C, 95% RH). The maximum strains (εmax) of the specimens pretreated decreased obviously which indicated decay of the bond behavior after exposure to the hygrothermal environment.

scholarly journals Mechanical Behavior of Fiber-to-concrete Interface in Textile Reinforced Concrete: Theoretical Model

2019 ◽  
Vol 8 (2) ◽  
pp. 70-78
Author(s):  
Shanshan Cheng
Keyword(s):  
Reinforced Concrete ◽  
Analytical Solution ◽  
Interfacial Shear Stress ◽  
Theoretical Models ◽  
Interfacial Bond ◽  
Textile Reinforced Concrete ◽  
Bond Slip ◽  
Bond Behavior ◽  
Concrete Interface

This paper presents a theoretical solution of a reinforcement-to-concrete interface model under pull-push loading. Expressions for the interfacial shear stress distribution and load-displacement history are derived for different loading stages. The full debonding propagation process is discussed in detail and the analytical solutions are verified by comparing with existing theoretical models. Results of the analytical solution are presented to illustrate how the bond length and local bond-slip law affect the interfacial bond behavior. While the case study in this paper is on textile reinforced concrete, the analytical solution is equally valid to similar mechanical cases such as rebar reinforced concretes.

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