Mechanical characterization of different FRCM systems for structural reinforcement

Donnini, Jacopo; Corinaldesi, Valeria

doi:10.1016/j.conbuildmat.2017.04.051

Cited by 118 publications

(65 citation statements)

References 48 publications

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“…The load‐carrying capacity ( P u ) of the FRCM specimens had proportionally increased with an increase in the number of fabric plies (Figure a), basically because of the increase in the effectual fabric area. Similar observations on the effect of N on P u were reported elsewhere . On the other hand, the effect of the number of fabric plies on the FRCM tensile strength ( σ u ) was less significant (within 20% as shown in Figure b).…”

Section: Resultssupporting

confidence: 88%

“…In principle, the tensile characteristics of the distinct constituents of FRCM (i.e., mortar and fabric) do not sufficiently provide indications on the overall FRCM composite behavior; therefore, tensile characterization tests of the FRCM are required to grasp the interaction between the fabric and encompassing mortar within the composite. Consequently, a significant amount of research was devoted in the past few years on the subject of FRCM tensile characterization . In these studies, various types of FRCM fabric were investigated such as carbon, polyparaphenylene benzobisoxazole (PBO), glass, basalt, aramid, steel, and less often, natural/vegetal fabric .…”

Section: Research Significancementioning

confidence: 99%

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Tensile characterization of multi‐ply fabric‐reinforced cementitious matrix strengthening systems

Younis

Ebead

Shrestha

2019

Structural Concrete

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Fabric reinforced cementitious matrix (FRCM) is a composite consisted of highstrength fibers impregnated in a cement-based mortar, and is commonly used for strengthening reinforced concrete and masonry structures. Comprehending the tensile behavior of FRCM is important to achieve a reliable and accurate design of FRCM strengthening systems. The current paper reports on the results of an experimental study on the tensile characterization of FRCM. A total of 40 FRCM specimens (410 × 50 mm, varied in thickness) were prepared and tested. The tensile characterization tests were conducted according to AC 434 guidelines using clevisgrip mechanism. The tests were used to assess the effect of two parameters:(a) fabric type (carbon/glass) and (b) number of fabric plies (one/two/three/four).The results showed that the tensile strength of carbon-FRCM specimens was approximately 1.33 times that of the glass-FRCM counterparts. Three distinct failure modes were observed, namely, (a) ductile fabric slippage in carbon-FRCM (up to three plies of fabric); (b) brittle fabric delamination in carbon-FRCM with four plies of fabric;and (c) brittle fabric rupture in glass-FRCM systems. The FRCM tensile loadcarrying capacity had proportionally increased with the number of fabric plies; less significant effect (within 20%) was observed on the corresponding ultimate tensile stresses (considering the net fabric area as the effective area). K E Y W O R D Scomposite, fabric-reinforced cementitious matrix, mechanical characterization, strengthening, textile reinforced concrete, textile reinforced mortar

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Section: Resultssupporting

confidence: 88%

Section: Research Significancementioning

confidence: 99%

Tensile characterization of multi‐ply fabric‐reinforced cementitious matrix strengthening systems

Younis

Ebead

Shrestha

2019

Structural Concrete

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“…In addition, using lower strengthening ratio of basalt fibers showed higher tensile strengths. In the study by Donnini and Corinaldesi (2017), the same behavior was also investigated when multiple fabric plies were used in the TRM composites. Moreover, the tensile test results also indicated that the use of coated fabrics, including carbon and basalt fibers, could improve the ultimate tensile strength and modulus of elasticity in the cracked stage (Signorini et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties of Carbon Fiber-Textile Reinforced Mortar (TRM) Characterized by Different Anchorage Methods

Kim

Truong

Park

et al. 2018

Int J Concr Struct Mater

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In the present study, tensile tests were carried out to investigate the tensile behaviors of textile reinforced mortar (TRM) composite specimens. The TRM specimens were composed of one layer of carbon fibers, as the reinforcement, and aluminum cement-based mortar, as the matrix. The primary parameter of the test specimens was the anchorage method, which was newly developed to improve the tensile behavior of the composite: spreading the ends of fiber filaments, reinforcing the ends of fiber filaments using glass fiber reinforced polymer tabs or steel rebars, and coating the ends of fiber filaments with aluminum oxide powder. From the test results, it was found that most TRM specimens using developed anchorage methods exhibited ductile behavior. Moreover, the use of the developed anchorage methods could increase the cracking strength and peak strength of the composite specimens up to 66.1 and 97.9%, respectively. The failure mode of the test specimens was governed by a partial rupture of carbon fibers, except for the BASE specimen and specimen reinforced with steel rebars. Finally, the tensile stress-strain relationship of TRM specimens was idealized as bilinear stress-strain response curves following the guidance specified in ACI 549.4R-13.

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“…The third phase is characterized by the slippage of the fabric within the inorganic matrix. This phenomenon has been clearly highlighted in other studies concerning the mechanical characterization of FRCM systems [17][18][19]. The slope of the curve in this stage depends on the friction developed at the interface between fabric and inorganic matrix.…”

Section: Fig 3 Stress-strain Curves For Tested Specimensmentioning

confidence: 55%

Concrete columns confined with different composite materials

Donnini

Corinaldesi

2018

MATEC Web Conf.

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In the last decades, the need for upgrading, strengthening and retrofitting of existing concrete structures is rapidly growing. Composite materials showed to be an optimal solution to face this problem, combining high efficacy with low invasiveness. The use of Fiber Reinforced Polymers (FRP) to wrap concrete columns has been widely investigated and became a very successful method to improve their structural performances. However, it has been recognized that FRPs, due to the presence of an organic resin, have a few drawbacks, such as poor mechanical behavior at high temperatures, lack of vapor permeability and impossibility to be installed on wet surfaces. This experimental work aims to propose a comparison between three different innovative methods as possible strengthening solutions for existing concrete columns. The structural behavior of 20 reduced scale concrete columns, realized by using a low performance concrete, in order to reproduce the poor mechanical properties of existing structures, was investigated. Two unreinforced column were tested in compression as reference. Six of them where reinforced by applying an external layer of FRP, with different types of fabric reinforcement (made of carbon or PBO fibers). Six columns were reinforced by using the same fabrics coupled with an inorganic matrix (FRCM) instead of epoxy. Six other columns were reinforced by using a layer of High Performance Fiber Reinforced Concrete (HPFRC) of 3 cm thick. Experimental results have been analyzed and performance of the three reinforcement systems have been compared.

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Mechanical characterization of different FRCM systems for structural reinforcement

Cited by 118 publications

References 48 publications

Tensile characterization of multi‐ply fabric‐reinforced cementitious matrix strengthening systems

Tensile characterization of multi‐ply fabric‐reinforced cementitious matrix strengthening systems

Tensile Properties of Carbon Fiber-Textile Reinforced Mortar (TRM) Characterized by Different Anchorage Methods

Concrete columns confined with different composite materials

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