Analyses of the fatigue behavior of carbon short-fiber-reinforced concrete (CSFRC) under tension and flexion

Carbon short-fiber-reinforced concrete (CSFRC) is a novel material with superior mechanical properties, including enhanced compressive, tensile, and flexural tensile strengths compared to conventional concrete. Additionally, CSFRC exhibits pseudo-ductile behavior under tensile and flexural stresses, allowing it to sustain significant damage before failure. This characteristic suggests that CSFRC may also perform well under dynamic loading, making it a subject of extensive research interest. This study aims to advance understanding of CSFRC's fatigue behavior under harmonic loading in both tension and flexion. To achieve this, 16 tension tests and 20 flexion tests were conducted. The results indicate that CSFRC demonstrates excellent fatigue resistance, with superior performance in tension compared to flexion, highlighting potential limitations in shear resistance. Four distinct loading procedures were applied, each potentially affecting fatigue performance. For data analysis, three measurement techniques were employed: strain gauge strain measurements, digital image correlation, and voltage measurements. Results from these techniques showed strong agreement, underscoring the robustness of the findings.