Jaramillo Machacua, Honorio Rigoberto, and Roberto Roland Yoctun Rios. “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 October 12, 2024. https://revistas.uclave.org/index.php/gt/article/view/4380.