المجلة الدولية للعلوم والتقنية

This research paper presents a comprehensive comparative assessment of the effects of Carbon Nanofibers (CNF) and Polypropylene Fibers (PPF) on mitigating shrinkage cracks in high-strength concrete. The study encompasses a series of experimental tests to evaluate the mechanical properties, shrinkage behaviour, and durability of concrete mixes reinforced with these fibers. The Control Mix, without any fiber reinforcement, serves as the baseline for comparison. The results indicate that the PPF Mix exhibits superior compressive strength and significantly reduces shrinkage, highlighting its effectiveness in enhancing the concrete's structural integrity and mitigating crack formation. The CNF Mix demonstrates a notable improvement in durability, suggesting its potential in prolonging the lifespan of concrete structures. The tensile strength of the concrete is maintained with PPF, while a slight decrease is observed with CNF. The comprehensive analysis provides valuable insights into the role of these fibers in concrete reinforcement, emphasizing the potential benefits and areas for optimization. The findings of this study contribute to the ongoing efforts in material science and civil engineering to develop more resilient and durable concrete structures, particularly in applications where high strength and crack resistance are paramount. Keywords: High-Strength Concrete , Carbon Nanofibers , Polypropylene Fibers, Shrinkage Cracks, Mechanical Properties, Durability, Concrete Reinforcement.