Influence of restraint thermal effects on the bond strength of externally bonded CFRP-concrete joints

2019 ◽  
Vol 221 ◽  
pp. 110858
Author(s):  
Alessandro Proia ◽  
Stijn Matthys
Keyword(s):  
Bond Strength ◽  
Thermal Effects ◽  
Externally Bonded ◽  
Concrete Joints

Investigating the effect of steel fiber content on bond behavior between externally bonded CFRP-to-concrete joints

Structures ◽  
2022 ◽  
Vol 36 ◽  
pp. 565-579
Author(s):  
Comfort Mensah ◽  
Benzhi Min ◽  
Alex Osei Bonsu ◽  
Zhenqing Wang
Keyword(s):  
Steel Fiber ◽  
Fiber Content ◽  
Bond Behavior ◽  
Externally Bonded ◽  
Concrete Joints

Alkali and temperature long-term effect on the bond strength of fiber reinforced polymer-to-concrete interface

2017 ◽  
Vol 52 (15) ◽  
pp. 2103-2114 ◽  
Author(s):  
Mahdie Mohammadi ◽  
Majid Barghian ◽  
Davood Mostofinejad ◽  
Adel Rafieyan
Keyword(s):  
Bond Strength ◽  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Particle Image Velocimetry Technique ◽  
Reinforced Polymer ◽  
Long Term Effect ◽  
Image Velocimetry ◽  
Externally Bonded ◽  
Bond Characteristics

The effects of such environmental conditions as alkali media at temperatures of 23℃, 40℃, and 60℃ were investigated on the fiber reinforced polymer-to-concrete bond strength. For this purpose, 42 specimens were strengthened via the externally bonded reinforcement and the externally bonded reinforcement on grooves techniques. The specimens were later subjected to the single-shear test after the specified durations of exposure to an alkaline medium. The particle image velocimetry technique was used to investigate such bond characteristics of the strengthened specimens as load-slip behavior, strain profiles, and strain fields along the fiber reinforced polymer-to-concrete bond. Experimental results showed that the specimens strengthened via the externally bonded reinforcement on grooves method exhibited ultimate bond loads by up to 50% higher than those strengthened via the externally bonded reinforcement method.

scholarly journals Effectiveness of Various Techniques Using FRP for the Strengthening of R. C. Beams with Tension Lap Splices

2019 ◽  
pp. 1-18
Author(s):  
Mohamed H. Makhlouf
Keyword(s):  
Bond Strength ◽  
Cross Section ◽  
Epoxy Adhesive ◽  
Experimental Program ◽  
Near Surface ◽  
Lap Splices ◽  
Lap Splice ◽  
Flexural Performance ◽  
Externally Bonded ◽  
Near Surface Mounted

This paper presents an experimental program conducted to investigate the flexural performance of RC beams with tension reinforcement lap splice strengthened using externally bonded FRP different techniques in splice region. The specimens were reinforced on the tension side with four deformed bars spliced at mid span. The tested beams are of 3200 mm total length and 250*120 mm cross section, tested in positive bending. The considered parameters were splice length, type of FRP (glass or carbon), strengthening techniques in splice region (externally confine strips around cross section, Near Surface Mounted technique "NSM" stirrups, externally bonded sheets or bars on the tension face, number of GFRP strips layers (one layer, two layers, and three layers), and shape of NSM stirrups (Box or U shape). No additional anchorage mechanism or bonding methodology was applied for the FRP strips on the concrete except the epoxy adhesive. The effect of these factors on the failure of modes, the ultimate load, the bond strength and that the ductility were investigated. The results indicated that all applied strengthening techniques were efficient in improving the bond strength of the lap splices, the ductility, and the load-deflection behavior of the tested beams, especially when strips were installed over the splice region. This study approved that NSM technique gave more prominent simplicity of employ.

Interface Shear Strength of Carbon Fiber Mesh (CFM) Attached to RC Surface for External Reinforcing

2006 ◽  
Vol 324-325 ◽  
pp. 799-802
Author(s):  
Soo Yeon Seo ◽  
Hyun Do Yun ◽  
Chang Sik Choi ◽  
Ki Bong Choi
Keyword(s):  
Carbon Fiber ◽  
Bond Strength ◽  
Drying Shrinkage ◽  
Strengthening Effect ◽  
Interface Shear ◽  
Existing Structures ◽  
Externally Bonded ◽  
Direct Tensile ◽  
Direct Tensile Test ◽  
Fiber Mesh

The strengthening of concrete structures in situ with externally bonded carbon fiber is increasingly being used for repair and rehabilitation of existing structures since carbon fiber has good mechanical properties such as high tensile strength, good resistances to corrosion, and low self-weight, which are attractive for retrofitting of RC member. In using Carbon Fiber Mesh (CFM) as a retrofit material for RC member, most important structural property that should be developed is the bond strength between RC member and CFM. The additional strength increment by CFM can be developed if the bond strength is sufficient. If it is not, the strengthening effect can not be expected due to the bond failure between concrete and CFM. A direct tensile test was performed in order to find the variation of bond strength and load-displacement response of CFM attached to the concrete and the result is presented in this paper. The key parameters of the test are the location of clip for the installation of CFM, number of clips and thickness of cover mortar. Test results indicate that the bond strength is dependent on the number of clips and maximized at clip numbers of three per each rod. In specimens without clips, the highest strength was found in the specimen with cove mortar of 30mm and lowest one in specimen with largest mortar thickness. This means that in too much thick of cover mortar, it seems that the amount of drying shrinkage is increased and this reduces rather than improves the bond strength.

Assessment of a bond strength model for FRP reinforcement externally bonded over masonry blocks

2014 ◽  
Vol 61 ◽  
pp. 147-161 ◽  
Author(s):  
Francesca Ceroni ◽  
Barbara Ferracuti ◽  
Marisa Pecce ◽  
Marco Savoia
Keyword(s):  
Bond Strength ◽  
Strength Model ◽  
Externally Bonded ◽  
Frp Reinforcement
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