From: Grading assessment of steel bar corrosion in concrete structures based on naive Bayesian model and spontaneous magnetic flux leakage effect
Rebar condition
Rust grade
Rust rate α
γ range
Correct number
Accuracy
No rust
1
0≤α<0.02
0≤γ<0.2
0
100.0%
Slight rust
2
0.02≤α<0.1
0.2≤γ<0.4
11
91.6%
Moderate rust
3
0.1≤α<0.2
0.4≤γ<0.9
10
56.6%
Severe rust
4
0.2≤α≤1
γ≥0.9
22
91.7%
Total
43
79.6%