Interface Evaluation of Carbon Textile Reinforced Composites

Silva, Rebecca M. C.; Trindade, Ana Carolina Constâncio; Silva, Flávio Alves da

doi:10.1007/978-3-030-76551-4_19

Cited by 1 publication

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“…Fiber reinforcements are most commonly used in geopolymer, and cementitious applications as randomly dispersed short fibers and fabrics, with the latter arranged in longitudinal, 2D and 3D arrangements. All types of fibers can be used to reinforce these composites, aiming at a desired application, such as basalt 21 and ceramic fibers 22 for thermal resistance, carbon 23 and steel fibers 24 for high strength, natural fibers 25,26 to reduce environmental impacts and durability issues, as well as polymeric fibers [27][28][29] to tailor a multiple cracking performance in impact demanding solicitations. 29 The latter, however, presents great degradation when exposed to moderate temperatures, 30 thus not being able to bear significant ductility levels in environments exposed to temperatures higher than 200 • C. This behavior is not compatible with geopolymer composite capabilities, which in conventional materials design and formulations can reach 1150 • C 31,32 without recording significant damage to the microstructure.…”

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confidence: 99%

Fabrication and mechanical properties of metakaolin‐based geopolymer composites reinforced with auxetic fabrics

et al. 2023

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This work presents a novel experimental study on the use of auxetic fabrics as the main reinforcement in geopolymer composites, aiming at higher energy dissipation in impact demanding applications. For this, a potassium‐based geopolymer was reinforced with an auxetic fabric consisting of basalt fiber fillings positioned between helical auxetic yarns (HAY) made of a thermoplastic polyester core, and a stiffer liquid‐crystal polymer wrap, which dispersed the load demands into several single elements having different capabilities. The composites were investigated under quasi‐static flexural and tensile loadings, in both longitudinal and transverse directions. The latter showed increased mechanical strengths, up to 26 MPa in tension, and 12.8 MPa in flexural strength. Each fiber portion was tested in tension separately, reaching flexible (core) and stiffer (wrap and basalt) responses, whereas HAYs displayed combined performances due to a suitable auxeticity effect, that is, a negative Poisson's ratio. The pullout investigation justified the cracking and delamination of the composites, due to its cyclic lateral area modification, which created a load demand much higher than what the brittle geopolymer can sustain in this type of solicitation. Thermogravimetric analyses helped to predict the use of such configurations under thermal exposure, pointing out that the geopolymer material could be a suitable thermal barrier to prevent sudden degradation of the fabric under these conditions.

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