Tensile Performance of Textile-Reinforced Concrete after Fire Exposure: Experimental Investigation and Analytical Approach

Kapsalis, Panagiotis; Triantafillou, Thanasis; Korda, Eleni; Hemelrijck, Danny Van; Tysmans, Tine

doi:10.1061/(asce)cc.1943-5614.0001162

Cited by 23 publications

(8 citation statements)

References 27 publications

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“…The relatively good bond strength retention observed up to 200 ºC may be explained by the fact that some matrix micro cracks close after the occurrence of the thermal shrinkage, thus leading to an overall improvement of the bond strength. On the other hand, the marked bond strength reductions observed at temperatures above 200 ºC should be associated to the chemical degradation of the matrix, dehydration, and changes in the interphase morphology [8]. Concerning the slip at the maximum bond stress (sm), higher values were found for temperatures below 200 ºC (compared to what obtained at ambient temperature): this result points out that the slippage of the PBO fibres within the matrix increases with increasing temperatures.…”

Section: Table 2 -Results Of Tensile Tests On Pbo-frcm Composites (Av...mentioning

confidence: 76%

“…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%

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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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Section: Table 2 -Results Of Tensile Tests On Pbo-frcm Composites (Av...mentioning

confidence: 76%

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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“…Nominal thickness, as reported by the manufacturer, was taken as 0.048 mm. The average peak stress, associated strain and modulus of elasticity of this product were previously measured by Kapsalis 30 and reported to be 2200 MPa, 0.0136 and 195 GPa respectively . The coefficient of variation was of 7.0%, 10.2% and 10.1% in the same order.…”

Section: Methodsmentioning

confidence: 71%

Mechanical behavior of textile reinforced alkali-activated mortar based on fly ash, metakaolin and ladle furnace slag

Arce¹,

Azdejkovic²,

Lima³

et al. 2022

Open Res Europe

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The need for repair and maintenance has become dominant in the European construction sector. This, combined with the urge to decrease CO2 emissions, has resulted in the development of lower carbon footprint repair solutions such as textile reinforced mortars (TRM) based on alkali-activated materials (AAM). Life cycle studies indicate that AAM CO2 savings, when compared to Portland cement, range from 80% to 30%. Furthermore, in this study, recycled aggregates were considered with the aim to promote a circular economy mindset. AAM mortars formulation based on fly ash, ladle furnace slag and metakaolin were tested for compressive and flexural strength. Three out of all formulations were chosen for an analysis on the potential of these mortars to be used for TRM applications. Tensile and shear bond tests, combined with a concrete substrate, were executed as indicators of the TRM effectiveness. Scanning electron microscopy and chemical analysis based on energy dispersive X-ray spectroscopy were used to interpret the results and reveal the reasons behind the different level of performance of these composites. Results indicated that TRM based on high calcium fly ash are unsuitable for structural strengthening applications due to low bond between matrix and/or substrate and fibers. Metakaolin-based TRM showed good performance both in terms of tensile strength and bond capacity, which suggests potential as a repair mortar.

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“…Since the temperatures were low, this relaxation was attributed to modifications in the coating material. Based on evidence obtained from TGA (presented in the subsequent paragraph) and on findings from other researchers (e.g., [48]), the glass transition temperature for the polymeric coating agent was between 75 • C and 100 • C. The specific transition requires the breakage of secondary bonds between the atoms involved in this type of relaxation [49]. At 200 • C, the FWHM values for the basalt and the glass fibers increased, while the carbon remained unchanged.…”

Section: Xrd Sem and Tga Tests For The Yarnsmentioning

confidence: 99%

Residual Properties of Fibre Grids Embedded in Cementitious Matrices after Exposure to Elevated Temperatures

Yang

Krevaikas

2023

Buildings

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The use of fabrics in the form of grids embedded in cementitious matrices—usually termed as textile-reinforced mortar, fiber-reinforced cementitious matrix, or textile-reinforced concrete—demonstrate a more stable performance in elevated temperature conditions compared with fiber-reinforced polymers. This study investigated the residual tensile properties of bare yarns and fabrics in the form of grids embedded in a cementitious mortar after exposure to 100 °C, 200 °C, and 300 °C. Three different coated fabric textiles were used as reinforcement: carbon, basalt, and glass. Additionally, scanning electron microscopy (SEM), X-ray diffraction (XRD), and thermos-gravimetric analysis (TGA) were conducted to evaluate potential changes in the internal structure of the fibers and the mortar. The cracking stress, the tensile strength, and the ultimate strain of the composite specimens were increased after exposure to 100 °C, while only carbon and glass fiber grids retained their effectiveness up to 200 °C. At 300 °C, the coupons reinforced with carbon and basalt fibers deteriorated rapidly. Only the glass counterparts showed an improved overall performance due to fiber contraction and the differences in the coating material. The results highlight the differences in the performance of the three fiber types and the important role of the coating material in the overall composite behavior.

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Tensile Performance of Textile-Reinforced Concrete after Fire Exposure: Experimental Investigation and Analytical Approach

Cited by 23 publications

References 27 publications

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

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

Mechanical behavior of textile reinforced alkali-activated mortar based on fly ash, metakaolin and ladle furnace slag

Residual Properties of Fibre Grids Embedded in Cementitious Matrices after Exposure to Elevated Temperatures

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Tensile Performance of Textile-Reinforced Concrete after Fire Exposure: Experimental Investigation and Analytical Approach

Cited by 23 publications

References 27 publications

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

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

­­­Mechanical behavior of textile reinforced alkali-activated mortar based on fly ash, metakaolin and ladle furnace slag

Residual Properties of Fibre Grids Embedded in Cementitious Matrices after Exposure to Elevated Temperatures

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Mechanical behavior of textile reinforced alkali-activated mortar based on fly ash, metakaolin and ladle furnace slag