Rodríguez Fadragas C, Rodríguez González M. Dependence of ultrasonic pulse propagation velocity on free water content in concrete structure under tropical climate conditions. Mater. constr. [Internet]. 2012Mar.30 [cited 2024Apr.29];62(305):39-53. Available from: https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/627