[1] NBR 7680 (ABNT) (2015) Extraction, Preparation, Testing and analysis of Specimens of Concrete Structures: Part 1 (in Portuguese).
[2] NBR 8802 (ABNT) (2013) Determination of Ultrasonic Wave Propagation Velocity (in Portuguese).
[3] NBR 7584 (ABNT) (2012) Hardened Concrete: Superficial Hardeness Evaluation (in Portuguese).
[4] NBR 5739 (ABNT) (2007) Compression Test Cylindrical Specimens of Concrete (in Portuguese).
[5] Evangelista, A.C.J. (2002) Concrete Strength Evaluation Using Different NDT. Doctoral Thesis, University of Rio de Janeiro, Rio de Janeiro (in Portuguese).
[6] Andrade, D.S. and Figueiredo, E.P. (2012) Estimated Strength of Concrete Compression through Nondestructive Testing: Case Study of the Maracana Stadium. In: IBRACON, Ed., Brazilian Concrete Congress, Maceio, Vol. 54, 1-16.