3D scanning 1 EDS 1 EIS 1 HDG 1 History of engineering & technology 1 LPR 1 SEM 1 Technology: general issues 1 acid spraying test 1 adhesive strength 1 bond strength 1 cathodic protection 1 chloride ion corrosion resistance 1 chloride penetration 1 chlorides 1 coatings 1 compressive strength 1 concrete 1 concrete bio-corrosion 1 corrosion 1 corrosion inhibitor 1 durability 1 durability of concrete 1 electrochemical noise 1 fly ash 1 geopolymer coatings (GPC) impermeability 1 magnesium hydroxide coating 1 microstructure 1 optical measurements 1