|
Title |
Effect of Carbon-Fiber-Reinforced Polymer (CFRP) Strand Cross-Sectional Area and Spacing on the Flexural Behavior of Grid-Type CFRP-Reinforced Mortar Specimens
|
|
Authors |
김경민(Kyung-Min Kim) ; 박성우(Sung-Woo Park) |
|
DOI |
https://doi.org/10.4334/JKCI.2026.38.1.013 |
|
Keywords |
탄소그리드; 인장보강재; 휨거동; 직물섬유보강콘크리트; 모르타르 압축강도 carbon grid; reinforcement; flexural behavior; textile reinforced mortar; mortar compressive strength |
|
Abstract |
This study experimentally evaluated the flexural behavior of mortar specimens reinforced with grid-type carbon-fiber?reinforced polymer (CFRP), hereafter referred to as carbon grids. The experimental variables included the cross-sectional area and spacing of the longitudinal CFRP strands, as well as their resulting tensile capacities. The results showed that specimens with narrower CFRP strand spacing exhibited more uniformly distributed surface cracking and achieved the highest flexural strength, indicating that narrow CFRP strand spacing has a positive effect on flexural strength. However, their flexural efficiency coefficients were 0.86 and 0.60, and the post-peak absorbed energy accounted for the lowest proportion of total energy absorption, reflecting relatively brittle behavior. In contrast, specimens with larger CFRP strand cross-sectional areas exhibited widespread bond cracking. Their flexural efficiency coefficients were 0.41 and 0.28, indicating insufficient flexural strength development despite the highest tensile capacities of the longitudinal CFRP strands. Nevertheless, the post-peak absorbed energy accounted for 74 % and 177 % of the total absorbed energy, respectively, demonstrating relatively ductile behavior.
|