Reliability of UPV on Compressive Strength of Fiber-Reinforced Concrete

This study assesses the Ultrasonic Pulse Velocity (UPV) test's reliability in determining the quality and compressive strength of Fiber-reinforced concrete (FRC). Various Fiber types—including Glass Fiber (GFRC), Polypropylene Fiber (PFRC), Carbon Fiber (CFRC), and Crimped Steel Fiber (CSFRC)—were included into concrete mixes, and their UPV measurements were taken at 7, 28, 90, and 360-day curing intervals. The results indicate a strong correlation between UPV and compressive strength, with CSFRC exhibiting the highest correlation (R² = 0.98), followed by CFRC (0.95) and PFRC (0.92). GFRC showed a slightly lower correlation (R² = 0.86) due to its greater heterogeneity. The study confirms that UPV serves as an effective non-destructive testing (NDT) method for evaluating concrete quality and estimating compressive strength. Additionally, the findings emphasize the significance of Fiber type, dosage, and curing conditions in enhancing the structural performance of FRC.