Durability Evaluation of Concrete Bridges Based on the Theory of Matter Element Extension—Entropy Weight Method—Unascertained Measure
Table 2
Evaluation criteria for durability of girder bridges.
Evaluation indicators
I
II
III
IV
V
Concrete presumed strength uniformity,
≥0.95
0.9 to 0.95
0.8 to 0.9
0.7 to 0.8
≤0.7
Reinforcement corrosion potential level, /
≥−200
−300 to −200
−400 to −300
−500 to −400
≤500
Chloride ion content, /%
<0.15
0.15 to 0.4
0.4 to 0.7
0.7 to 1.0
≥1.0
Average value of concrete relative carbonation depth,
0.5
0.5–1.0
1.0–1.5
1.5–2.0
≥2.0
Crack width, /
<0.05
0.05 to 0.1
0.1 to 0.15
0.15 to 0.2
>0.2
Resistivity,
>20,000
15,000 to 20,000
10,000 to 15,000
5000 to 10,000
<5000
Characteristic value of reinforcement protective layer thickness,
＞0.95
0.85 to 0.95
0.7 to 0.85
0.55 to 0.7
≤0.55
Note: the evaluation criteria of the evaluation indices refer to the specifications of the Inspection and Evaluation of Load-Bearing Capacity of Highway Bridges [14].
