Bridge Damage Severity Quantification Using Multipoint Acceleration Measurement and Artificial Neural Networks

Table 1

Appearance ratings based on corrosion characteristics.

Appearance rating	Corrosion type	Grain size	Corrosion thickness	Color tone	Instance of appearance
1; (worst)	Laminated flaky corrosion	Larger than 25 mm	Thicker than 800 μm	Varying color tone
2	Imbricate corrosion	5 mm to 25 mm	400 μm to 800 μm	Varying color tone
3	Abnormal corrosion of the early phase	1 mm to 5 mm	Thinner than 400 μm	Varying color tone
4	Protective lust layers	Smaller than 1 mm	Thinner than 400 μm	Dark brown
5; (best)	In the early stage of the formation of protective lust layers	Smaller than 1 mm	Thinner than 200 μm	Light brown