Uniaxial tensile performance of warp-knitted carbon textile reinforced concrete

Date

2026-4

Author

Güray, Arda

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Textile Reinforced Cementitious Composites (TRCC) are innovative construction materials and techniques that combine traditional construction materials with high-strength textiles offering superior characteristics and better sustainability. TRCC represent a promising development in the construction industry and gaining popularity being implemented in various construction efforts. The cement-based composite products of TRCC, have several advantages over traditional construction materials such as reinforced concrete (RC) including increased tensile-strength, increased strength/weight ratio and better durability. Being one of the key ingredients of TRCC, the carbon textile in the system, its topology, its geometrical properties and manufacturing technique play a key role in the overall performance of the composite product. Although there exist various types of textile reinforcements, the vast majority of textiles implemented in TRCC up to date are woven (grid-like) carbon textiles. On the other hand, studies and applications with stitch-bond carbon (warp knitted, weft inserted) carbon textiles suggest that the stitch-bond textiles showed potential and may offer great advantages over woven textiles. Literature suggests that stitch-bonded textile reinforced concrete has higher tensile strength and shows a better crack propagation performance compared to woven textile reinforced concrete. However, literature also suggests that woven textiles offer more isotropy to the structural medium meaning they are suitable for applications where multi-directional loads are expected. In this study, 1-layer and 2-layer stitch-bond carbon reinforced concrete samples have been prepared utilizing two distinct carbon textiles in the warp and weft. These specimens were later subjected to direct tensile tests to achieve a better understanding on the effects of the grid architecture, yarn geometry and reinforcement ratio on the mechanical properties and behavior of the warp-knitted carbon textile reinforced cementitious composites. The specimen cracking behaviors and failure modes were observed during testing to gather information on the specimen behavior. The testing results were analyzed adopting schemes available in literature to calculate the critical mechanical properties that define the behavior of textile reinforced cementitious composites and force-strain diagrams are plotted to demonstrate the behavior of the CTRC systems. It was observed that the desired pseudo-ductile multiple cracking behavior was not captured for some specimens and the bond-slip failure mechanisms were dominantly governing for some of these specimens. The testing and analysis of warp-weft specimens also showed that response of warp-knitted carbon textile reinforced reinforced concrete is highly anisotropic due to the geometrical differences of the yarn structure in the warp and weft directions, which were identified per X-ray micro-tomography and SEM images. Another conclusion made in this study was that exceeding a critical reinforcement ratio was not solely sufficient to capture the desired multiple cracking pseudo-ductile response for CTRC, and the bond-slip mechanisms involved in the textile-matrix interface governed the tensile behavior of some specimens regardless of the reinforcement ratio.

Subject Keywords

Reinforcement ratio, Warp knitted carbon fiber textile, Textile grid, Clevis-grip, Textile Reinforced Concrete

URI

https://hdl.handle.net/11511/119136

Collections

Graduate School of Natural and Applied Sciences, Thesis