Influence of the Textile Placement on the Flexural Behaviour of Carbon Textile Reinforced Concrete
摘要
The flexural behaviour of any reinforced concrete element is governed by its internal lever arm between compressive and tensile forces. This internal lever is influenced by the placement of the reinforcement. The accuracy of reinforcement position becomes far more crucial inside thin Textile Reinforced Concrete (TRC) sections due to their slenderness compared to steel-reinforced concrete cross-sections, as only millimetres could alter the TRC’s mechanical and cracking behaviour. The aim of the present study is to quantify the influence of textile placement tolerances on the flexural behaviour of TRC. To do so, carbon textile reinforced concrete specimens of 50 mm thickness were cast with varying position of the fibre textiles inside the cross-section, hence shifting the neutral axis. Three different series were manufactured with varying mortar bottom cover of 8 mm, 5 mm and 3 mm, respectively. All samples were tested under four-point bending, and displacement and cracking behaviour were monitored by Digital Image Correlation (DIC). Additionally, the responses were compared to a numerical, layered composite model. The results showed that raising the textiles within the section significantly worsened the cracking pattern, while the textile position shift of up to 10% of the section’s thickness did not alter significantly the bending stiffness.