Influence of different set-up parameters on the bond behavior of FRCM composites

Bellini, Alessandro; Aiello, Maria Antonietta; Bencardino, Francesco; Bello, Claudia Brito de Carvalho; Castori, Giulio; Cecchi, Antonella; Ceroni, Francesca; Corradi, Marco; D’Antino, Tommaso; Santis, Stefano De; Fagone, Mario; Felice, Gianmarco de; Leone, Marianovella; Lignola, Gian Piero; Napoli, Annalisa; Nisticò, Mattia; Poggi, Carlo; Prota, Andrea; Ranocchiai, Giovanna; Realfonzo, Roberto; Sacco, Elio; Mazzotti, Claudio

doi:10.1016/j.conbuildmat.2021.124964

Cited by 24 publications

(10 citation statements)

References 50 publications

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“…This is particularly true in strengthening applications where fiber strength utilization is influenced by the textile-to-matrix and matrix-to-substrate bond. Tests conducted on TRM composites applied on brick masonry substrates [ 89 , 104 ] have shown that the bond strength at the interfaces quite often is far lower than the tensile capacity of high-strength fibers (i.e., steel and PBO). This gives rise to debonding phenomena associated with cohesive failure of the substrate or failure along the matrix-to-substrate or textile-to-matrix interfaces.…”

Section: Comparison Between Natural Trm and Conventional Composite Sy...mentioning

confidence: 99%

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

2023

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This paper discusses the challenges in using natural fibers for the development of textile-reinforced mortar (TRM) composites with pseudo-strain-hardening and multiple cracking behavior. The particular characteristics of natural vegetal fibers are analyzed with reference to data from the literature. It is concluded that the efficient use of these fibers as composite reinforcement requires the development of treatment or impregnation protocols for overcoming durability issues, eliminating crimping effects in tensile response and imparting dimensional stability. Relevant experimental research on the synthesis and performance of natural TRMs is reviewed, showing that the fabrication of such systems is, at present, largely based on empirical rather than engineering design. In order to set a framework regarding the properties that the constituents of natural TRM must meet, a comparative analysis is performed against inorganic matrix composites comprising synthetic, mineral and metallic reinforcement. This highlights the need for selecting matrix materials compatible with natural fibers in terms of stiffness and strength. Furthermore, a rational methodology for the theoretical design of natural TRM composites is proposed. First-order analysis tools based on rule-of-mixtures and fracture mechanics concepts are considered. Based on the findings of this study, paths for future research are discussed.

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Section: Comparison Between Natural Trm and Conventional Composite Sy...mentioning

confidence: 99%

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

2023

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“…Since the cross-section dimensions of the cables of the thermocouples could potentially affect the load transfer mechanism, both instruments were positioned at the extremity of the FRCM reinforcing strip far from the loaded edge (Fig. 3), where the bond deformation are expected to be small or negligible [51][52][53][54].…”

Section: Preparation Of the Specimens For Single-lap Shear Testsmentioning

confidence: 99%

Effect of temperature variations on the bond behavior of FRCM applied to masonry

2022

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In the last decades, Fiber Reinforced Cementitious Matrix (FRCM) composites were successfully introduced to repair and strengthen existing masonry structures. The good mechanical performances of these materials determined their efficiency as a strengthening technique; however, their durability is still an open issue. As a matter of fact, FRCM composites may be exposed to a combination of different environmental conditions and, additionally, to temperature variations due to solar radiation. The objective of this research was to study the effects of temperature variations on the bond behavior of a FRCM composite, constituted by a basalt grid and a lime-based mortar matrix, applied to masonry. For this purpose, an experimental investigation on thermally conditioned FRCM-strengthened masonry wallets is presented, in which 14 single-lap shear tests were performed. Before testing, samples were exposed to different target temperatures inside a climatic chamber: 32, 40, 50, 60 and 80 °C. Thermocouples were embedded within the FRCM reinforcing layers at two different depths to detect the inner temperature profiles and to control the conditioning process. The single-lap shear tests were then carried out inside the same climatic chamber, while maintaining the target temperature constant. A decrease in terms of peak-axial stress was observed by increasing temperature, along with a progressive change in the failure mode, from fiber rupture outside the bonded area to fiber slippage within the mortar matrix layers.

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“…Carozzi et al [26] compared the results of single and double direct shear bond test methods on polyparaphenylene benzobisoxazole (PBO), carbon and glass FRCM, proposing some details for each test. The influence of the testing apparatus, measuring devices, loading rate and clamping methods to be adopted in a RILEM-conforming test setup was more recently studied in a round-robin test program in Bellini et al [27].…”

Section: Introductionmentioning

confidence: 99%

“…Despite the great amount of research work in this field, it is evident that further knowledge is needed, aiming to cover all the typologies of support and exploring possible alternative ways of testing. The different test methods available correspond to different drawbacks to be overcome: poor clamping pressure, stress concentration, non-uniform yarn slippage and premature failure [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Experimental Characterization of Fabric-Reinforced Cementitious Matrix (FRCM) Systems Applied on Calcarenite Stone: Adoption of Non-Standard Setup for Double-Shear Bond Tests

Oddo,

Cavaleri,

Papanicolaou

et al. 2024

J. Compos. Sci.

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The use of Fabric-Reinforced Cementitious Matrix (FRCM) systems is an innovative method for strengthening structures, particularly masonry, while addressing environmental and economic concerns. Despite their widespread use, characterizing FRCM composites poses challenges due to their complex mechanical behavior and considerable variability in properties. The available standardized testing methods exhibit some inconsistencies, underscoring the need for reliable characterization procedures. This paper presents an experimental study on the bond behavior between FRCM materials and calcarenite stone using a non-standard setup for double shear bond tests. Different FRCM systems are considered, varying the matrix composition and fabric nature. The experimental results are evaluated in terms of maximum stress, slip and data dispersion, alongside comparisons with double shear tests on larger samples and single-lap shear. These findings provide insights into how the mortar nature influences the stress-slip curves, strength, ductility and failure modes. The experimental study demonstrates the repeatability and robustness, particularly in terms of peak strength, of the non-standard setup configuration utilized in the study. The study highlights the importance of reliable characterization procedures for FRCM materials, especially in bond behavior assessments, emphasizing the need for further research to enhance our understanding of their application in structural reinforcement.

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Influence of different set-up parameters on the bond behavior of FRCM composites

Cited by 24 publications

References 50 publications

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

Design of Strain-Hardening Natural TRM Composites: Current Challenges and Future Research Paths

Effect of temperature variations on the bond behavior of FRCM applied to masonry

Experimental Characterization of Fabric-Reinforced Cementitious Matrix (FRCM) Systems Applied on Calcarenite Stone: Adoption of Non-Standard Setup for Double-Shear Bond Tests

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