Effects of Thermal Conditioning at High Temperatures on the Response of Concrete Elements Confined with a PBO-FRCM Composite System

Ombres, Luciano; Mazzuca, P.; Verre, Salvatore

doi:10.1061/(asce)mt.1943-5533.0004053

Cited by 15 publications

(13 citation statements)

References 19 publications

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“…An important aspect of the FRCM application of strengthening systems is studying their carrying capacity under the influence of high temperatures [33]. It was established that heating/cooling down cycles affect the bearing capacity of FRCM systems for reinforcing reinforced concrete structures.…”

Section: Analysis Of Previous Researchmentioning

confidence: 99%

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

et al. 2023

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This article presents research on the bearing capacity and methods of calculating reinforced concrete beams on the shear without internal shear reinforcement, which are strengthened with a composite FRCM system. The test samples were divided into two series: the first series—control, in which the variable parameter was the shear span (a/d = 2, a/d = 1.5, and a/d = 1); and the second series—reinforced by the FRCM system, without load, and strengthened at different load levels. The method of calculating experimental beams was tested according to the current code and data from the fib report. In this article, recommendations for determining the angle of inclined struts θ, the coefficient of the concrete shear strength CRd,c, and the coefficient of the load level at which strengthening is performed are proposed. The calculation with the these recommendations showed a good convergence of experimental and theoretical data in the 16–29% range, which is a much higher convergence than the calculation without these recommendations.

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Section: Analysis Of Previous Researchmentioning

confidence: 99%

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

et al. 2023

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“…However, one of the main drawbacks of using FRCM materials as a strengthening system in degraded concrete or masonry structures is their mechanical behaviour at elevated temperatures. Indeed, the strength, stiffness and bond properties of FRCM materials undergo marked reductions even when heated to moderatately elevated temperature (200-300 ºC), mainly due to the degradation of the fibresto-matrix interface [5][6][7][8][9][10]. Despite the efforts made in the last years to study the mechanical behaviour at elevated temperature of this strengthening system, the understanding of many aspects is still very limited.…”

Section: Introductionmentioning

confidence: 99%

Effect of the elevated temperatures on the mechanical behaviour of PBO-FRCM systems

Ombres¹,

Mazzuca²,

Guglielmi³

2023

Proceedings of the 2022 IMEKO TC4 International Conference on Metrology for Archaeology and Cultural Heritage

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Over the last two decades, fabric reinforced cementitious matrix (FRCM) materials started to be used as a strengthening system in a wide variety of structural applications, especially where their firerelated advantages may offer an alternative to traditional composite materials (e.g. FRP materials). However, there is a major gap in the knowledge of FRCM composites: the lack of information about their mechanical response at elevated temperature. The main objective of this paper is to provide further insights about the influence of elevated temperatures on the mechanical properties of a Polypara-pheny lene-benzo-bisthiazole (PBO) FRCM system. Direct tensile (DT) tests and single lap direct shear tests (DS) were performed respectively on PBO FRCM specimens and PBO FRCM-concrete prisms, for temperatures ranging from 20 ºC up to 300 ºC. Specimens were first heated up to the target temperature, and then loaded up to failure at ambient temperature. The results obtained show that both tensile and bond strength suffer relatively low reductions up to 200 ºC. For increasing temperature, the degradation of the mechanical properties was more pronounced: at 300 ºC, the reductions of tensile and bond strength were 65% and 40%, respectively.

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“…As is well known, the mechanical properties of traditional-fiberreinforced polymer composites degrade significantly at elevated temperatures due to the decomposition of the polymer and the oxidation of fiber [13,14]. A fiber-grid-reinforced cementitious matrix exhibited lower flammability and better high-temperature resistance owing to the inorganic nature of the cementitious material, which made it more suitable for applications in structures subjected to fire [15,16]. Therefore, it was important to investigate the effect of elevated temperature on fiber-grid-reinforced cementitious material for reliable application under fire.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have been carried out regarding the residual properties of textilereinforced cementitious material after exposure to different high temperatures [15,[17][18][19][20][21][22]. The tensile test on mortar reinforced with one-layer AR-glass/carbon/carbon textile after exposure to high temperatures for 1 h showed that the mechanical properties of the specimen essentially remained unchanged before 200 • C, and then the strength dropped significantly when the temperature increased to 400 and 600 • C [17].…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of Basalt-Fiber-Grid-Reinforced Mortar before and after Exposure to Elevated Temperature

et al. 2022

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This paper presents an experimental study on the tensile behavior of basalt-fiber-grid-reinforced mortar (BGRM) before and after exposure to an elevated temperature of 300 °C considering the effect of fiber grid type, short polyvinyl alcohol fiber (PVA), and high-temperature exposure time. The experimental results show that the mortar plates reinforced with woven textile T25 and fiber-reinforced polymer (FRP) grid G50 exhibited more pronounced strain-hardening behavior. The highest peak stress was obtained for the T25-reinforced plate, which was 85% and 32% higher than that of the T5- and G50-reinforced plates, respectively. Meanwhile, the bridging effect of PVA fibers in mortar can improve the tensile properties. As the high-temperature exposure time increased, the cracking and peak stress of BGRM decreased significantly. Especially for the T5-reinforced plate after exposure to elevated temperature for 2 h, the cracking and peak stress decreased by 60.5% and 38%, respectively. The positive effect of short PVA fibers on the tensile properties of the BGRM became obsolete owing to the melting of short fibers at high temperature. Furthermore, an exponential strength degradation model related to high-temperature exposure time was proposed.

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Effects of Thermal Conditioning at High Temperatures on the Response of Concrete Elements Confined with a PBO-FRCM Composite System

Cited by 15 publications

References 19 publications

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

A Calculation Model for Determining the Bearing Capacity of Strengthened Reinforced Concrete Beams on the Shear

Effect of the elevated temperatures on the mechanical behaviour of PBO-FRCM systems

Tensile Behavior of Basalt-Fiber-Grid-Reinforced Mortar before and after Exposure to Elevated Temperature

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