EFFECT OF MATRIX COMPOSITION ON THE UNIAXIAL TENSILE BEHAVIOR OF CARBON TEXTILE REINFORCED CEMENTITIOUS COMPOSITES

Date

2023-12-7

Author

Sherzai, M. Hamahang

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Textile-reinforced concrete (TRC) is a distinct type of concrete that employs con-tinuously manufactured textiles instead of traditional steel reinforcing bars to manage tensile stresses within a structure. As with any composite material, the mechanical properties of composites are primarily determined by the proportions and properties of the individual materials that make up the composite. Conse-quently, the mechanical properties of TRC are expected to be influenced by both the amounts and fibers of the textile and the surrounding cementitious matrix. In addition, the adhesion between the textile and the cementitious matrix, as well as any interlocking mechanism introduced during the textile manufacturing process, could also play a significant role. It should be noted that in textile nomenclature, yarns or threads are initially formed from bundles of continuous fibers also called monofilaments. Later, textiles can be produced by various manufacturing techniques using a va-riety of geometric patterns. Weaving is one of those manufacturing technique in which two distinct sets of yarns or threads are interlaced at right angles to form the textile. The yarns along the textile length are termed warp yarns, and those along its width are termed as weft yarns. In this experimental study, carbon textiles woven in a grid-like pattern are used to produce the C-TRCC specimens. In addition, unlike the usual use of these textiles in the warp direction, the textiles were used in the weft direction. As for the ce-mentitious matrix, two different base matrices (M7 and ECC) with different bind-er contents were used. These two base matrices incorporated different types (steel and PVA) and amounts (1% and 2%) of discrete short fibers. Uniaxial tensile tests are performed on C-TRCC specimens prepared using carbon textiles with different reinforcement ratios. As a result of more than 70 C-TRCC specimens, it was observed that carbon tex-tiles experienced a slippage-like phenomenon in which the core filaments within the yarn slipped from the sheath filaments adhering to the cementitious matrix. It was also observed that the stiffer M7 matrix exhibited more brittle behavior com-pared to the softer ECC matrix.

Subject Keywords

Carbon textile reinforced concrete, reinforcement ratio, weft direction, matrix toughness

URI

https://hdl.handle.net/11511/108235

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Graduate School of Natural and Applied Sciences, Thesis