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Fuzzy expert system to assess corrosion of cast/ductile iron pipes from backfill properties

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Figure

Table 1   Scores of soil properties used in the 10-P scoring method
Table 2   Other point scoring methods
Table 3   Percentage clay fines for different soil types
Table 4   Field data and calculated corrosivity potential (CoP)   Corrosivity  Potential (CoP)  No of inputs R  •-cm  pH    Clay fines %  Redox  potential  mV  Sulfide  presence    DR  mm/yr  3 5  590 7.7  30  -29 1 0.025 0.467  0.774  580 7.7  30  -30  1
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