“Reliability of the Ultrasonic Pulse Velocity for Analysis and Comparison of the Compression Strength of Conventional Concrete With Addition of Steel Fiber and Polypropylene”. Gaceta Técnica 24, no. 1 (January 31, 2023): 2–21. Accessed July 24, 2026. https://revistas2.uclave.org/index.php/gt/article/view/4380.