Ultrasound Investigation in Practice: A Case Study Port of Rotterdam
In our previous post we discussed the theoretical basis of non-destructive ultrasound investigation for tension anchors. Today we dive into practice with a concrete case study: an aged quay wall in the Port of Rotterdam.
The Challenge
The owner of the quay suspected corrosion in the anchor rods after more than 25 years of service. A destructive tensile test was costly and would temporarily weaken the structure. Our assignment: determine the corrosion rate and remaining service life without removing the anchors.
Our Approach
We selected 12 critical anchor points for detailed investigation. Using advanced ultrasound transducers, we measured the sound velocity and signal attenuation through the steel. This data was compared with reference measurements on non-corroded steel of the same type.
"The CUR Recommendation 166 provided the crucial calculation rules to convert the measured signal change into a realistic material thickness reduction."
Results & Conclusion
The analysis showed that for 9 of the 12 anchors, the corrosion fell within safe margins. However, three anchors exhibited localized, advanced degradation. Based on our report, the owner could establish a targeted, cost-effective maintenance plan: replace only the weak anchors.
This case study confirms the value of ultrasound investigation as a reliable, fast, and non-destructive method for assessing port infrastructure, fully in accordance with Dutch guidelines.