Adhesion between SRP and Masonry: Influence of Moist Condition of Specimens and Presence of Salts in the Substrate

2019 ◽  
Vol 817 ◽  
pp. 182-188 ◽  
Author(s):  
Yu Yuan ◽  
Cristina Gentilini ◽  
Christian Carloni ◽  
Elisa Franzoni
Keyword(s):  
Ion Chromatography ◽  
Weak Link ◽  
New Technology ◽  
Shear Tests ◽  
Artificial Weathering ◽  
Bond Behavior ◽  
Lap Shear ◽  
Reinforced Polymer ◽  
Moist Condition

In recent years, steel reinforced polymer (SRP) composites have emerged as a new technology for structural strengthening, and several researches have validated the effectiveness of SRP for masonry strengthening. Research has been carried out to study the bond behavior of SRP composites applied to a masonry substrate. However, how the moist and salt on masonry surface will affect bond, which is the weak link in real strengthening applications, is little known yet. This study aims at investigating the bond behavior of SRP composites applied to moist and salt-laden masonry blocks that were subjected to an artificial weathering protocol. Single-lap shear tests were conducted to determine the bond behavior, while ion chromatography provided the salts distribution of weathered specimens to interpret some results of the shear tests.

Stationary Shoulder Friction Stir Assisted Scribe Technique for Dissimilar Joining

2021 ◽  
Vol 143 (9) ◽  
Author(s):  
Hrishikesh Das ◽  
Piyush Upadhyay
Keyword(s):  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fast Process ◽  
Shear Tests ◽  
Dissimilar Joints ◽  
Friction Stir ◽  
Stationary Shoulder ◽  
Lap Shear ◽  
Reinforced Polymer ◽  
Steel Joints

Abstract We report on implementation of a stationary shoulder in dissimilar joints of Al-steel and Al-carbon fiber reinforced polymer (CFRP) using friction stir assisted scribe technology (FaST). Viable joint strength similar to the conventional FaST process was demonstrated in Al-Steel. A significant improvement in as-welded surface roughness for both Al-steel and Al-CFRP cases was also achieved. Interrupted lap shear tests performed on Al-steel joints and a corresponding computational model indicate the joint failure typically occurs in Al sheet via a crack that originates at the steel hook tip on the loading side. A similar fracture path was observed in an Al-CFRP joint.

A comparison of the bond behavior of PBO-FRCM composites determined by double-lap and single-lap shear tests

2015 ◽  
Vol 64 ◽  
pp. 37-48 ◽  
Author(s):  
L.H. Sneed ◽  
T. D'Antino ◽  
C. Carloni ◽  
C. Pellegrino
Keyword(s):  
Shear Tests ◽  
Bond Behavior ◽  
Lap Shear

scholarly journals Study of the Bond Capacity of FRCM- and SRG-Masonry Joints

CivilEng ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 68-86
Author(s):  
Karrar Al-Lami ◽  
Tommaso D’Antino ◽  
Pierluigi Colombi
Keyword(s):  
Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Shear Tests ◽  
Bond Behavior ◽  
Bond Performance ◽  
Direct Shear Tests ◽  
Reinforced Polymer ◽  
Inorganic Substrates ◽  
Externally Bonded ◽  
Steel Cord

Fiber-reinforced cementitious matrix (FRCM) and steel-reinforced grout (SRG) have been increasingly applied as externally bonded reinforcement to masonry members in the last few years. Unlike fiber-reinforced polymer (FRP), FRCM and SRG have good performance when exposed to (relatively) high temperature and good compatibility with inorganic substrates, and they can be applied to wet surfaces and at (reasonably) low temperatures. Although numerous studies investigated the mechanical properties and bond performance of various FRCM and SRG, new composites have been developed recently, and their performance still needs to be assessed. In this study, the bond behavior of three FRCM composites and one SRG composite applied to a masonry substrate is investigated. Sixteen single-lap direct shear tests (four tests for each composite) are performed. The FRCM studied comprised one layer of carbon, PBO (polyparaphenylene benzobisoxazole), or alkali-resistant (AR)-glass bidirectional textile embedded within two cement-based matrices. The SRG composite comprised one layer of a unidirectional stainless-steel cord textile embedded within a lime-based matrix. The results show a peculiar bond behavior and failure mode for each composite. Based on these results, the behavior of the carbon and PBO FRCM is modeled solving the bond differential equation with a trilinear cohesive material law (CML).

scholarly journals Clinching of Thermoplastic Composites and Metals—A Comparison of Three Novel Joining Technologies

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2286
Author(s):  
Benjamin Gröger ◽  
Juliane Troschitz ◽  
Julian Vorderbrüggen ◽  
Christian Vogel ◽  
Robert Kupfer ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Composite Material ◽  
Process Design ◽  
Failure Mechanisms ◽  
Thermoplastic Composites ◽  
Material Structure ◽  
Shear Tests ◽  
Load Bearing ◽  
Lap Shear ◽  
Resultant Material

Clinching continuous fibre reinforced thermoplastic composites and metals is challenging due to the low ductility of the composite material. Therefore, a number of novel clinching technologies has been developed specifically for these material combinations. A systematic overview of these advanced clinching methods is given in the present paper. With a focus on process design, three selected clinching methods suitable for different joining tasks are described in detail. The clinching processes including equipment and tools, observed process phenomena and the resultant material structure are compared. Process phenomena during joining are explained in general and compared using computed tomography and micrograph images for each process. In addition the load bearing behaviour and the corresponding failure mechanisms are investigated by means of single-lap shear tests. Finally, the new joining technologies are discussed regarding application relevant criteria.

scholarly journals Experimental and Numerical Investigation on the Steel Reinforced Grout (SRG) Composite-to-Concrete Bond

2020 ◽  
Vol 4 (4) ◽  
pp. 182
Author(s):  
Luciano Ombres ◽  
Salvatore Verre
Keyword(s):  
Bond Length ◽  
Failure Modes ◽  
Peak Load ◽  
Element Model ◽  
Test Results ◽  
Shear Tests ◽  
Bond Slip ◽  
Bond Behavior ◽  
Direct Shear Tests ◽  
Inorganic Matrix

In the paper, the bond between a composite strengthening system consisting of steel textiles embedded into an inorganic matrix (steel reinforced grout, SRG) and the concrete substrate, is investigated. An experimental investigation was carried out on medium density SRG specimens; direct shear tests were conducted on 20 specimens to analyze the effect of the bond length, and the age of the composite strip on the SRG-to-concrete bond behavior. In particular, the tests were conducted considering five bond length (100, 200, 250, 330, and 450 mm), and the composite strip’s age 14th, 21st, and 28th day after the bonding. Test results in the form of peak load, failure modes and, bond-slip diagrams were presented and discussed. A finite element model developed through commercial software to replicate the behavior of SRG strips, is also proposed. The effectiveness of the proposed numerical model was validated by the comparison between its predictions and experimental results.

EFFECT OF WET-DRY CYCLING ON BOND BEHAVIOR OF GFRP STRENGTHENED HISTORIC MASONRY STRUCTURES

2016 ◽  
Vol 78 (5-2) ◽  
Author(s):  
Meng Jing ◽  
Werasak Raongjant
Keyword(s):  
Research Work ◽  
Fiber Reinforced Polymer ◽  
Masonry Structures ◽  
Test Results ◽  
Bond Behavior ◽  
Historic Masonry ◽  
Water Permeation ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Cycling Condition

The objective of this research work is to determine the effect of wet-dry cycling on bond behavior of historic masonry structures strengthened by Glass Fiber Reinforced Polymer (GFRP). Shear bond testing was carried out through total 36 specimens exposed to dry, full moisture or wet-dry cycling conditions.  The selected samples were then tested at 0, 30, 60 and 90 days. Post-ageing test was also preceded on total sixty masonry prisms exposed to dry, full moisture or wet-dry cycling conditions. The compressive strengths of selected samples were then tested at 0, 40, 70 and 100 days. The test results showed an obvious decrease of the bond strength between GFRP sheets and bricks in the wet-dry cycling condition. For masonry prisms with or without GFRP strengthening, in the first 40 days, the compressive strength of GFRP bonded prism decreased quickly to the value near that of prism without GFRP. After 40 days the rate of decrease became slow, which means that, sheets retrofitted outside the masonry prisms helped to improve their durability by reducing water permeation. 

scholarly journals Shear-bond behavior of fiber reinforced polymer (FRP) rods and sheets

2018 ◽  
Vol 195 ◽  
pp. 02001
Author(s):  
Aylie Han ◽  
Buntara S. Gan ◽  
Agung Budipriyanto
Keyword(s):  
Epoxy Resin ◽  
Concrete Surface ◽  
Failure Behavior ◽  
Direct Function ◽  
Moment Capacity ◽  
Bond Behavior ◽  
Reinforced Polymer ◽  
Application Procedure ◽  
External Reinforcement ◽  
Direct Tensile

The use of external reinforcement has gained an increasingly major position due to the adjustment in earthquake standards, mandating a significant improvement in the section’s moment capacity. Studies on the behavior and enhancement contributed by FRP sheets demonstrated that its effectiveness was a direct function of the shear-bond strength. A prominent contributing factor was the response of the interface between the sheets and the epoxy resin, and the interface between the epoxy resin to the concrete surface. Recently, FRP rods were produced. These rods which are 8 and 10 millimeters in diameter offer ease in use, and simplicity in the application procedure. This study looked into the shear-bond behavior of FRP rods as compared to sheets. Direct tensile stresses were applied to test the shearbond between the sheets and rods, attached to a 35 MPa concrete surface. The failure behavior of the bond was also monitored. Additionally, the effectiveness of the embedded depth of the FRP rods relative to the concrete surface was also analyzed.

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