From: Use of Higher-Harmonic and Intermodulation Generation of Ultrasonic Waves to Detecting Cracks due to Steel Corrosion in Reinforced Cement Mortar
Sample
First crack (days)
x0 (µm)
End of the test (days)
9
10 (9)
11.5
31 (30)
10
9 (8)
10.2
15 (14)
11
8 (7)
8.9