On the shear behavior of natural curauá fabric reinforced cement-based composite systems

Teixeira, Felipe Pinheiro; Cardoso, Daniel C.T.; Silva, Flávio de Andrade

doi:10.1016/j.engstruct.2021.113054

Cited by 6 publications

(7 citation statements)

References 52 publications

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“…Following the results obtained in this study, and previous ones on cement composites 26 and geopolymer resins, 27 it can be noticed that these types of materials, manufactured in-loco, at low/room temperature, and reinforced with high-performance fibers, can reach similar shear stresses and shear moduli when compared to FRP and low-tech ceramics. Their low energy consumption may compensate for any performance vulnerability, being potentially effective in several fields such as construction, repair technology, automobile, aircraft manufacturing, and many others.…”

Section: Materials Comparisonsupporting

confidence: 86%

“…Figure 10 is a schematic diagram comparing the shear properties of the geopolymers characterized in this study with typical properties found in literature for various materials 26–46 under V‐notch and Iosipescu testing methods.…”

Section: Resultsmentioning

confidence: 91%

“…The first is tested with an elongated specimen, whereas the second presents a butterfly type of shape, both with ±45° notches positioned centrally. The Iosipescu method has been previously used to study cement‐based composites (reinforced with natural fibers 26 ) and geopolymer resins, 27 reaching shear stresses of up to 7 MPa. A previous study, 28 however, noticed excessive values when employing the Iosipescu method, due to the occurrence of tension/compression loadings in the central part of the specimen.…”

Section: Introductionmentioning

confidence: 99%

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V‐notched rail shear test applied to geopolymer composites

2022

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This work presents a systematic study of the shear properties of a potassiumbased geopolymer reinforced with distinct types of fibers. Chopped basalt reinforcements in lengths from 3 mm up to 50 mm and 13 μm in diameter were compared with thicker 20-mm length, basalt mini bars, sand-coated basalt mini rods, and steel fibers. The samples were tested under a V-notched rail shear tests (ASTM D7078), coupled with optical measurements, namely, digital image correlation, allowing a novel study of their crack patterns and failure modes under shear loading. In general, the use of chopped fibers resulted in shear strengths of up to 9 MPa and shear moduli of 4.3 GPa, with no significant variation with fiber length increments, neither in shear stress nor strain at peak load (0.1%). Mini bars and steel fiber reinforcements resulted in slightly lower shear stresses of 7.1 and 8.4 MPa, respectively. They exhibited greater strain values at peak loads, up to 2.1% which were attributed to fiber-matrix enhanced adhesions, thereby allowing gradual debonding and increased ductility. This effect was also recorded for mini rods, but at much lower strength levels, which did not contribute to their multiple cracking capacities. The alignment of the mini rods in 45 • directions resulted in a 50% increase in shear stress, showing the feasibility of tailoring the manufacturing process to attend to distinct demands.

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Section: Materials Comparisonsupporting

confidence: 86%

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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V‐notched rail shear test applied to geopolymer composites

2022

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“…The fibers were received in bundles, measuring approximately one meter in length, and were manually brushed to detangle them. Different from the other authors that also used natural fibers [30,32,43,50], the sisal fibers were not washed in warm water. In this experiment, just brushing and cutting in the demanded length were executed.…”

Section: Sisal Fibersmentioning

confidence: 99%

“…Therefore, fiber tensile strength, matrix microstructure, and fiber length, alignment, and content are important to the process of mitigating crack propagation [42]. Furthermore, in the case of composites with aligned fibers, attention should be paid to the number of reinforcement layers, the distance between them, and the thickness and quality of the matrix covering layer, in order to enhance the fiber's action in controlling the opening of cracks [32,43].…”

Section: Introductionmentioning

confidence: 99%

On the mechanical properties and crack pattern analysis of a strain-hardening cement-based composite reinforced by natural sisal fibers

et al. 2022

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Besides the strength enhancement and strain improvement (strain-hardening behavior), the use of natural fibers as reinforcement in cement-based matrices can also be highlighted as an economical and eco-friendly alternative for the future of the construction industry. In the present work, cement-based composites reinforced by natural sisal fibers were produced and tested under direct tensile loading. The Portland cement was partially replaced by pozzolans (metakaolin -MK and fly ash -FA), aiming to produce a calcium hydroxide-free matrix to ensure the durability of the fibers. The natural sisal fibers were used in a 5% volume fraction (in mass), divided into three layers. The mechanical properties of composite plates were compared to other literature results and demonstrated to be compatible with recent research. The crack pattern was analyzed by Digital Image Correlation (DIC) for a better understanding of their failure mechanisms. The material presented a tensile strength increase after the first crack formation, marked by multiple cracking partners from this point. Finally, a comparison between direct (LVDTs) and indirect (DIC) methods of strain measurement was done and demonstrated minor results for the DIC, approximately 84% of those obtained from the LVDTs.

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