The document discusses investigating the corrosion resistance of reinforced concrete structures. It examines how factors like concrete quality, reinforcing steel type, and exposure conditions affect corrosion strength. Several common corrosion tests are described, including half-cell potential, chloride ion penetration, corrosion rate measurement, salt spray testing, and rapid chloride ion penetration. The half-cell potential test procedure is outlined, noting equipment needs and precautions to ensure accurate results. Test results from one site found cracks in beams indicating corrosion of reinforcement, with readings showing some areas at higher risk of corrosion. In conclusion, corrosion remains a major challenge for reinforced concrete durability.