Textile-cement bond enhancement: Sprinkle some hydrophilic powder

Alatawna, Amr; Sripada, Raghu; Nahum, Lior; Birenboimi, Matan; Regev, Oren; Peled, Alva

doi:10.1016/j.cemconcomp.2021.104031

Cited by 10 publications

(5 citation statements)

References 31 publications

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“…TRM/TCM and dispersed fibers still face many challenges from using cellulosic fiber and their constitution of textiles in connection with the matrix. [7][8][9][10] Adding short fibers uniformly dispersed throughout the volume into the concrete matrix hinders microcrack expansion by creating a bridge between crack edges. [11][12][13] This effect occurs in load/deflection curves after the elastic linear phase, where microcracks develop and increase in stress.…”

Section: Introductionmentioning

confidence: 99%

“…The resistance to yarn slippage is due entirely to frictional forces. 8,18,19 This phenomenon, called telescope pull-off failure behavior, is common to other textiles reinforced concrete (TRC), mainly made of glass and carbon, and it covers the field of bonding properties. [20][21][22][23] In addressing the problem of telescope pull-off failure, solutions are still being studied to achieve better composite tensile properties, focused on other textile sources.…”

Section: Introductionmentioning

confidence: 99%

“…They require another cover by particles: sandblast (silica) is one of the most applied, an inorganic source that permits good bonding properties 26 ; PVA's fiber 20 ; mortar, graphene oxide, among other particles. 8,22 In another way, textile coated by micro silica powder, without polymeric resin, acted as an efficient option for improving the performance of carbon TRC, filling interstices in the bundle spaces and bonding with the matrix. Micro silica presented an increase of 65% in toughness at the pullout test in comparison to uncoated yarn samples 27 and enhanced 29% in terms of ultimate strength action of glass (ARG) TRC in three bending tests.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jute textiles with enhanced interfacial bonding as reinforcement for cementitious composites

Kohan,

Fioroni,

Azevedo

et al. 2024

Journal of Composite Materials

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In fabric-cement composites, the limited impregnation of cementitious matrix products due to thick and twisted yarns leads to premature failure due to poor bonding strength. In addition, cellulosic textile reinforcements have many challenges about durability, appearance of voids at mortar-fiber interface, and rise of microcracks. Textile performances were evaluated in different conditions: coated with micro-silica powder, pretreated, and without any treatment. This study also assessed how textile weave structure and yarn geometry configuration affect the interactions of two different jute textiles (Close Weave Jute Fabric – CJF and Open Weave Jute Fabric - OJT) when used as reinforcement in mortar matrix. Textile characterization and composite analysis (by four-point bending tests, SEM/EDS, and physical tests) were conducted to assess the different textile reinforcements, the mechanical behavior of produced composites, and visual and chemical compounds analysis of the interfacial transition zone between textile and mortar matrix after silica coating. Micro silica powder coating was deemed necessary to address limited impregnation and to avoid telescope pull-off. Weave structure determined the difference between jute fabrics to reinforce mortar matrix, being only OJF (larger interstices in the weave structure) with micro silica coating allowed a better matrix interaction and stood out from the other textiles and achieved the best specific energy of all samples, (4.28 ± 0.91) kJ.m-2. Calcium and silicon inside the yarn interstices and textile-matrix interface indicate the formation of strong bonds by calcium-silicate-hydrate products. The silica coating treatment enhanced formation of strong bonds, which demonstrated future promise for natural fiber application.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Jute textiles with enhanced interfacial bonding as reinforcement for cementitious composites

Kohan,

Fioroni,

Azevedo

et al. 2024

Journal of Composite Materials

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“…The absence of hydrophilic groups on the carbon chain indeed results in a relatively poor chemical compatibility between the surface of carbon fibers and inorganic matrices [ 8 ]. Moreover, the inorganic matrix (usually cement-based) is not able to fully penetrate between the filaments of the yarn due to its high viscosity, thus allowing the innermost filaments to slip over each other, showing the so-called telescopic behavior [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Fabric-Reinforced Cementitious Matrix (FRCM) Carbon Yarns with Different Surface Treatments Embedded in a Cementitious Mortar: Mechanical and Durability Studies

Bompadre

Donnini

2022

Materials

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Nowadays, FRCM systems are increasingly used for the strengthening and retrofitting of existing masonry and reinforced concrete structures. Their effectiveness strongly depends on the bond that develops at the interface between multifilament yarns, which constitute the reinforcing fabric, and the inorganic matrix. It is well known that fabric yarns, especially when constituted by dry carbon fibers, have poor chemical-physical compatibility with inorganic matrices. For this reason, many efforts are being concentrated on trying to improve the interface compatibility by using different surface treatments on multifilament yarns. In this paper, three different surface treatments have been considered. The first two involve yarn pre-impregnation with flexible epoxy resin or nano-silica coating, while the third one involves a fiber oxidation process. Uniaxial tensile tests were carried out on single carbon yarns to evaluate tensile strength, elastic modulus and ultimate strain before and after surface treatments, and also after yarn exposure to accelerated artificial aging conditions (1000 h in saline or alkaline solutions at 40 °C), to evaluate their long-term behavior in aggressive environments. Pull-out tests on single carbon yarns embedded in a cementitious mortar were also carried out, under normal environmental conditions and after artificial exposure. Epoxy proved to be the most effective treatment, by increasing the yarn tensile strength of 34% and the pull-out load of 138%, followed by nano-silica (+9%; +40%). All surface treatments were shown to remain effective even after artificial environmental exposures, with a maximum reduction of yarn tensile strength of about 13%.

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Cellulosic Fabric-Reinforced Cementitious Matrix (FRCM): Ligaments, Treatments, and Employment

et al. 2022

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Textile-cement bond enhancement: Sprinkle some hydrophilic powder

Cited by 10 publications

References 31 publications

Jute textiles with enhanced interfacial bonding as reinforcement for cementitious composites

Jute textiles with enhanced interfacial bonding as reinforcement for cementitious composites

Fabric-Reinforced Cementitious Matrix (FRCM) Carbon Yarns with Different Surface Treatments Embedded in a Cementitious Mortar: Mechanical and Durability Studies

Cellulosic Fabric-Reinforced Cementitious Matrix (FRCM): Ligaments, Treatments, and Employment

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