What techniques are used to assess concrete structures for repair?

Assessment techniques include: (1) Visual inspection - crack mapping, delamination sounding, (2) Cover meter - locating reinforcement and cover depth, (3) Half-cell potential - corrosion probability mapping, (4) Resistivity - corrosion rate prediction, (5) Chloride profiling - powder sampling at depths, (6) Carbonation depth - phenolphthalein indicator, (7) Core testing - strength, petrography, chloride/sulfate content, (8) Ground penetrating radar - locating voids, reinforcement, (9) Load testing - capacity verification. Assessment guides repair method selection and extent.