Abstract
Textile-reinforced concrete (TRC) is a promising building material that meets modern environmental protection and sustainability requirements. For the widespread use of this innovative building material, empirical models based on material properties determined by laboratory tests are needed. This study investigated the ability to measure the strain of carbon rovings with small strain gauges during standard tensile tests. The measured values were compared and validated using the digital image correlation (DIC) method. Another component of this study is the investigation of a suitable adhesive for the application of the sensors to SBR-coated (styrene-butadiene rubber) carbon roving. Three test series with three different adhesives, cyanoacrylate adhesive, epoxy resin, and polychloroprene, were produced and tested for tensile strength. The validation tests showed that a strain loss occurs in the adhesive joint of the strain gauges. It was found that cyanoacrylate adhesives, such as M-Bond 200, suffered the lowest losses and are recommended for further investigations. The epoxy resin influences the stiffness of the carbon fibers at the contact surface too strongly, while the polychloroprene adhesive could not transfer the actual roving strain due to insufficient stiffness of the bond line.
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