Inverse identification of the bond behavior for jute fibers in cementitious matrix

Ferreira, Saulo Rocha; Martinelli, Enzo; Pepe, Marco; Silva, Flávio de Andrade; Filho, Romildo Dias Toledo

doi:10.1016/j.compositesb.2016.03.097

Cited by 42 publications

(33 citation statements)

References 27 publications

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“…In this zone, the composite works by maintaining compatibility of deformations, i.e., the reinforcement and the matrix deform exactly the same length, so that the resulting stress depends on the amount of material and its modulus of elasticity. In this case, as the volume fraction of the fibers is 15% (lower than 30%) and the deformability of the nonwoven fabric is higher than >30% (see Table 2), the mechanical characteristics of the composite correspond more to those of the matrix than to the fiber [13,29,30]. …”

Section: Resultsmentioning

confidence: 99%

“…In this zone, the material works without compatibility of deformations since the matrix absorbs most of the compression forces on the upper part of the specimen and the reinforcement absorbs most of the tensile forces on the nether part of the specimen. Under these conditions, the stress transfer mechanism is achieved by the reinforcement-matrix adhesion in the zones between cracks [30]. If there is a low fiber-matrix adhesion, once the first crack appears there is a deboning of the fibers and fracture of the composite.…”

Section: Resultsmentioning

confidence: 99%

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Tensile and Flexural Properties of Cement Composites Reinforced with Flax Nonwoven Fabrics

et al. 2017

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Abstract:The aim of this study is to develop a process to produce high-performance cement-based composites reinforced with flax nonwoven fabrics, analyzing the influence of the fabric structure-thickness and entanglement-on mechanical behavior under flexural and tensile loadings. For this purpose, composite with flax nonwoven fabrics with different thicknesses were first prepared and their cement infiltration was evaluated with backscattered electron (BSE) images. The nonwoven fabrics with the optimized thickness were then subjected to a water treatment to improve their stability to humid environments and the fiber-matrix adhesion. For a fixed thickness, the effect of the nonwoven entanglement on the mechanical behavior was evaluated under flexural and direct tension tests. The obtained results indicate that the flax nonwoven fabric reinforcement leads to cement composites with substantial enhancement of ductility.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tensile and Flexural Properties of Cement Composites Reinforced with Flax Nonwoven Fabrics

et al. 2017

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“…In general, the response observed is initially elastic, followed by a non-linear behavior until brittle failure is reached, as found in TRM composite systems used in masonry buildings (Zhang, Aljewifi, and Li 2013;Ferreira et al 2016;Dalalbashi et al 2018;Banholzer, Brameshuber, and Jung 2005;Banholzer 2006;Donnini, Lancioni, and Corinaldesi 2018). During the elastic stage, the load is transferred from the yarns to the matrix by adhesion until the bond strength is achieved, subsequently, micro cracks are developed on the interface mortar-mesh and the nonlinear response begins.…”

Section: Characterization Of the Matrix-fiber Bond Behaviormentioning

confidence: 98%

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Romanazzi

Oliveira

2019

International Journal of Architectural Heritage

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Despite the current awareness of the high seismic risk of earthen structures, little has been done so far to develop proper strengthening solutions for the rammed earth heritage. Based on the effectiveness of TRM for masonry buildings, the strengthening of rammed earth walls with externally bonded fibers using earth-based mortar is being proposed as a compatible solution. In this context, the investigation of bond behavior was conducted by means of direct tensile tests, pull-out tests and single lap-shear tests. The specimens were prepared using earth-based mortars and two different types of meshes (glass and nylon) while considering different-bonded lengths. The direct tensile tests on TRM coupons showed the high capacity of the nylon mesh in transferring stresses after cracking of the mortar. The pull-out tests highlighted that in the case of glass fiber mesh, the bond was granted by friction, while the mechanical anchorage promoted by the transversal yarns granted the bond of the nylon mesh. Finally, the single lap-shear tests showed that the adopted earth-based mortar seems to limit the performance of the strengthening.

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“…Consequently, the strength of the entire yarn was assessed by means of tensile tests on both untreated and coated specimens. Finally, aiming to study the influence of the coating on the yarns-to-matrix bond, pull-out tests were carried out by taking out both untreated and treated yarns from mortar cylinders [30]. Although no specific investigations have been carried out in this regard, it is worth emphasizing that further analysis is required for analyzing the XSBR coating sustainability impact of the entire system.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, since one of the main issues related to the use of natural fibers in cement or lime-based composites is their adherence with the matrix, a carboxylated styrene butadiene rubber (XSBR, NITRIFLEX S/A, São Paolo, SP, Brazil) latex was used to coat part of the yarns under investigation. As a matter of fact, it has been demonstrated that the copolymer, largely used in the textile industry both with natural and synthetic fibers, can improve the bond between plant fibers and the surrounding matrices [30]. Specifically, the flax yarns were cut from the fabric (Figure 2a) and fully immersed in the polymer in environmental temperature conditions (Figure 2b), then the excess liquid was removed from the external surface ( Figure 2c) and the treated fibers were dried at a controlled temperature of 38 ± 2 • C for 24 h. During the drying period, the yarns were arranged in a frame specifically studied to give them an elongated and regular shape ( Figure 2d).…”

Section: Flax Fibersmentioning

confidence: 99%

Influence of an Impregnation Treatment on the Morphology and Mechanical Behaviour of Flax Yarns Embedded in Hydraulic Lime Mortar

Ferrara

Pepe

Martinelli

et al. 2019

Fibers

Self Cite

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The increasing attention toward environmental aspects has led, also in the sector of construction materials, to the need for developing more eco-friendly solutions. Among several options, the employment of low energy raw materials appears as an efficient solution intended to enhance the sustainability of building structures. One of the applications moving in this direction is the use of plant fibers as a reinforcement in cement-based composites, hence named as natural textile reinforced mortar (NTRM) composites. Although representing a promising technique, there are still several open issues concerning the variability of plant fibers properties, the durability, and the mechanical compatibility with the mortar. This study aims at investigating the influence of an impregnation process on the thread’s morphology and on the mechanical response. Therefore, the geometry of dry and impregnated flax threads is identified by using scanning electron microscope (SEM) images analysis, and their mechanical response in tension is assessed. In addition, the fibers-to-mortar bond behavior is investigated by means of pull-out tests. The proposed results show that the impregnation procedure employed, although not improving the fibers-to matrix bond, leads to a standardisation of the threads morphology and reduces the thread’s deformability in tension, and paves the way for further investigations on a larger scale.

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Inverse identification of the bond behavior for jute fibers in cementitious matrix

Cited by 42 publications

References 27 publications

Tensile and Flexural Properties of Cement Composites Reinforced with Flax Nonwoven Fabrics

Tensile and Flexural Properties of Cement Composites Reinforced with Flax Nonwoven Fabrics

Experimental Investigation on the Bond Behavior of a Compatible TRM-based Solution for Rammed Earth Heritage

Influence of an Impregnation Treatment on the Morphology and Mechanical Behaviour of Flax Yarns Embedded in Hydraulic Lime Mortar

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