Soft Insert for Support Modeling of Slightly Textile Reinforced Concrete

Vlach, Tomáš; Laiblová, Lenka; Ženíšek, Michal; Řepka, Jakub; Hájek, Petr

doi:10.4028/www.scientific.net/kem.760.158

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…Flexural strength tests were also conducted with the same equipment on test bodies measuring 360 × 100 × 18 mm cured for 91 days. In this case, a 4-point test was performed with a controlled loading of 2.0 mm/min following standard ASTM C947-03 [ 37 ] and recommendations of Vlach et al [ 38 ].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Light Cementitious Matrix with Composite Textile Reinforcement from Garment Waste

et al. 2023

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The use of recycled waste has been the focus of several studies due to its potential to allow a more sustainable use of construction materials and minimize improper waste disposal in landfills or incinerators. More specifically, garment textile waste has been examined as internal reinforcement of cementitious matrices to increase the deformability and control fissure formation. In this study, polyester textiles are analyzed and incorporated in cementitious composites in order to evaluate their mechanical properties. Results show that significant improvements in mechanical properties of composites are obtained depending on the impregnation treatment applied to the textile waste. In the direct tensile stress test, the waste impregnation with styrene butadiene polymer plus silica fume improved 35.95% in the weft direction and 9.33% in the warp direction. Maximum stress increased 53.57% and 64.48% for composites with styrene–butadiene rubber impregnation and styrene–butadiene rubber plus silica fume impregnation, respectively, when compared to the unreinforced composite. The flexural tensile strength of composites impregnated reinforcements with styrene–butadiene rubber and styrene–butadiene rubber plus silica fume presented increases in strength by 92.10% and 94.73%, respectively, when compared to the unreinforced sample. The impact test confirmed that styrene–butadiene rubber plus silica fume impregnation produced greater tenacity of the composite. In the microstructure, it is confirmed that the impregnated textile reinforcement resulted in composites with greater adhesion between the fabric and the cementitious matrix. Thus, light textile waste is concluded to be a viable construction material for non-structural elements.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Light Cementitious Matrix with Composite Textile Reinforcement from Garment Waste

et al. 2023

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“…The finite element mesh of the structure was made of hexahedra quadratic bricks, with six of them representing the thickness of the structure. Supports for corresponding element activation were modeled with a soft insert based on previous experience because of the more accurate crack development in the model [ 24 ]. The reinforcement was modeled as 1D polylines with assigned interaction conditions and its diameter, and other parameters were set as material properties.…”

Section: Methodsmentioning

confidence: 99%

“…The structure was loaded with a constant displacement applied to a midpoint of the support plate close to the free end of the sample. A neoprene layer between the steel support plate and the TRC sample was placed due to crack development under the support plate [ 24 ]. Figure 6 a presents a model of rigid frame closing while Figure 6 b—of its opening.…”

Section: Rigid Frame Corner Modelmentioning

confidence: 99%

Reinforced L-Shaped Frame Made of Textile-Reinforced Concrete

et al. 2023

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Textile-reinforced concrete is becoming more and more popular. The material enables the realization of very thin structures and shells, often with organic shapes. However, a problem with this reinforcement occurs when the structure is bent (contains a corner), and the flexural stiffness around this bent area is required. This article presents the design, solution, and load-bearing capacity of an L-shaped rigid frame made of textile-reinforced concrete. Basic material parameters of concrete matrix and carbon textile reinforcement were supplemented by a four-point bending test to calibrate fracture energy Gf, critical compressive displacement Wd, solver type, and other parameters of a numerical model created by Atena Engineering in specialized non-linear structural analysis software for reinforced concrete structures. The calibrated numerical model was used to evaluate different variants of carbon textile reinforcement of the L-shaped frame. The carbon textile reinforcement was homogenized using epoxy resin to ensure the interaction of all fibers, and its surface was modified with fine-grained silica sand to increase the cohesion with the concrete matrix. Specimens were produced based on the most effective variant of the L-shaped frame reinforcement to be experimentally tested. Thanks to the original shaping and anchoring of the reinforcement in the corner area, the frame with composite textile reinforcement is rigid and can transmit the bending stresses in both positive and negative directions. The results of the mechanical loading test on small experimental specimens correspond well to the results of numerical modeling using Atena Engineering software.

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“…These experimental sample shapes and sizes was also chosen based on their suitability for the subsequent verification of mechanical properties in four-point bending tests. The thickness of the sample was adjusted to the approximate thickness of the TRC in real applications, and was also based on previous experiments [ 39 , 40 ]. Then, it was possible to compare the results.…”

Section: Methodsmentioning

confidence: 99%

Use of Cement Suspension as an Alternative Matrix Material for Textile-Reinforced Concrete

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Vlach

et al. 2021

Materials

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Textile-reinforced concrete (TRC) is a material consisting of high-performance concrete (HPC) and tensile reinforcement comprised of carbon roving with epoxy resin matrix. However, the problem of low epoxy resin resistance at higher temperatures persists. In this work, an alternative to the epoxy resin matrix, a non-combustible cement suspension (cement milk) which has proven stability at elevated temperatures, was evaluated. In the first part of the work, microscopic research was carried out to determine the distribution of particle sizes in the cement suspension. Subsequently, five series of plate samples differing in the type of cement and the method of textile reinforcement saturation were designed and prepared. Mechanical experiments (four-point bending tests) were carried out to verify the properties of each sample type. It was found that the highest efficiency of carbon roving saturation was achieved by using finer ground cement (CEM 52.5) and the pressure saturation method. Moreover, this solution also exhibited the best results in the four-point bending test. Finally, the use of CEM 52.5 in the cement matrix appears to be a feasible variant for TRC constructions that could overcome problems with its low temperature resistance.

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Soft Insert for Support Modeling of Slightly Textile Reinforced Concrete

Cited by 4 publications

References 12 publications

Evaluation of Light Cementitious Matrix with Composite Textile Reinforcement from Garment Waste

Evaluation of Light Cementitious Matrix with Composite Textile Reinforcement from Garment Waste

Reinforced L-Shaped Frame Made of Textile-Reinforced Concrete

Use of Cement Suspension as an Alternative Matrix Material for Textile-Reinforced Concrete

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