Jaramillo Machacua HR, Yoctun Rios RR. 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 [Internet]. 2023Jan.31 [cited 2024Nov.24];24(1):2-21. Available from: https://revistas.uclave.org/index.php/gt/article/view/4380