The evaluation of hardened, dense, reinforced concrete remains a balance between traditional hands-on methods and modern instrumentation. In this article, Simon Bladon of CRL Surveys highlights the continuing importance of visual inspection and delamination hammer testing, while also exploring advanced techniques such as radar, ultrasonic tomography, half-cell potential measurements, resistivity, and linear polarisation resistance.
Careful sampling, carbonation testing, and petrographical analysis underpin reliable assessments, while experienced operatives remain essential for interpreting results. By combining proven methods with selective use of technology, engineers can accurately assess concrete condition, plan targeted repairs, and make informed decisions that ensure the long-term durability and safety of complex structures.
