scholarly journals Effect of Different Environments’ Conditioning on the Debonding Phenomenon in Fiber-Reinforced Cementitious Matrix-Concrete Joints

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7566
Author(s):  
Salvatore Verre
Keyword(s):  
Water Environment ◽  
Hot Water ◽  
Fiber Reinforced ◽  
Shear Tests ◽  
Cementitious Matrix ◽  
Direct Shear Tests ◽  
Number Of Layers ◽  
Experimental Campaign ◽  
Different Types ◽  
Concrete Joints

This paper presents the results of an experimental study conducted to understand the bond capacity through single-lap, direct-shear tests of fiber-reinforced cementitious matrix (FRCM)-concrete joints under an alkaline and hot water environment. The experimental campaign was focused on a FRCM system equipped with two different types of fibers, (PBO) and Carbon. After the conditioning, the specimens conditioned were subjected to visual inspection, and the experimental results were compared with the unconditioned specimens. Moreover, in this present work, the number of layers and the conditioning time were varied.

Micromechanical analysis of loop-formed fiber-reinforced soil composite

2013 ◽  
Vol 44 (3) ◽  
pp. 418-433
Author(s):  
Seyed Mahdi Hejazi ◽  
Seyed Mahdi Abtahi ◽  
Mohammad Sheikhzadeh ◽  
Amir Mostashfi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Reinforced Soil ◽  
Soil Reinforcement ◽  
Fiber Reinforced ◽  
Shear Tests ◽  
Direct Shear Tests ◽  
Proposed Model ◽  
Fiber Reinforced Soil ◽  
Element Method

In this research, loop-formed fiber is introduced as a novel reinforcement method of soil composites instead of using ordinary fibers. In order to investigate the materials' mechanical properties, the shear behavior of both fiber and looped-fiber-reinforced soil composites was analyzed by micromechanical method (finite element method) and a set of direct shear tests. The results indicate that the looped-fiber soil composite exhibits greater failure strain energy compared with fiber-reinforced soil composite at the same fiber orientation in the substrate. Furthermore, the proposed model demonstrated two major reinforcing components: “the fiber effect” and “the loop effect.” The latter effect is the key benefit and the main advantage of using looped fibers over ordinary fibers in soil reinforcement. Altogether, there is a close agreement between finite element method outputs and experimental results, suggestive of a novel technical textile material that could potentially be used in geotechnical engineering.

Effect of Hot Water Environment on Tensile Fracture Properties of Carbon Fiber Reinforced Polyoxamide Composites

2014 ◽  
Vol 627 ◽  
pp. 177-180
Author(s):  
Kazuto Tanaka ◽  
Shunsuke Maehata ◽  
Tsutao Katayama ◽  
Masahiro Shinohara
Keyword(s):  
Carbon Fiber ◽  
Water Environment ◽  
Polyamide 6 ◽  
Hot Water ◽  
Tensile Fracture ◽  
Fiber Reinforced ◽  
Fracture Properties ◽  
Properties Of Materials ◽  
Carbon Fiber Reinforced ◽  
Reinforced Thermoplastics

Matrices for carbon fiber reinforced thermoplastics are appropriate to use comparatively cheaper resins such as polyamide. However polyamide 6 is highly hygroscopic and the mechanical properties of materials are reported to be degraded by water absorption. Polyoxamide (PX) has been developed as polyamide resins with low hygroscopicity. In this study, the effect of hot water environment on the tensile fracture properties of carbon fiber/polyoxamide composites has been clarified.

Loading rate effect on the debonding phenomenon in fiber reinforced cementitious matrix-concrete joints

2017 ◽  
Vol 108 ◽  
pp. 301-314 ◽  
Author(s):  
Christian Carloni ◽  
Salvatore Verre ◽  
Lesley H. Sneed ◽  
Luciano Ombres
Keyword(s):  
Loading Rate ◽  
Rate Effect ◽  
Fiber Reinforced ◽  
Cementitious Matrix ◽  
Concrete Joints

Defect Identification and Acceptance of FRP and FRCM Masonry Reinforcement by Infrared Thermography Survey

2014 ◽  
Vol 624 ◽  
pp. 80-87
Author(s):  
Riccardo Angiuli ◽  
Paolo Corvaglia ◽  
Alessandro Largo ◽  
Angela Coricciati
Keyword(s):  
Infrared Thermography ◽  
Diagnostic Technique ◽  
Masonry Structures ◽  
Defect Identification ◽  
Cementitious Matrix ◽  
Partial Repair ◽  
Experimental Campaign ◽  
Reinforced Plastic ◽  
Different Types

Masonry structures, both historic and newly built, often need reinforcement interventions to meet new or increased loads or in the case of adjustment against seismic actions. The result of this type of intervention must be verified or tested to ensure the correspondence between what was originally designed and what was realized. In addition to numerous destructive and semi-destructive techniques, infrared thermography (IRT) is a contactless diagnostic technique which can rapidly provide information about the success of such reinforcement interventions, even on masonry structures. In the present work an experimental campaign to evaluate the effectiveness of IRT in identifying different types of defects that can be found on different reinforcement systems (FRP, Fibre-reinforced plastic, or FRCM, Fibre Reinforced Cementitious Matrix) for masonry structures has been performed. A thermographic survey was repeated even after repair works on the defects in order to identify a procedure of acceptance that can also be used on areas subject to total or partial repair.

Effect of the inherent eccentricity in single-lap direct-shear tests of PBO FRCM-concrete joints

2016 ◽  
Vol 142 ◽  
pp. 117-129 ◽  
Author(s):  
Tommaso D’Antino ◽  
Lesley H. Sneed ◽  
Christian Carloni ◽  
Carlo Pellegrino
Keyword(s):  
Direct Shear ◽  
Shear Tests ◽  
Direct Shear Tests ◽  
Concrete Joints
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