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NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1061/(ASCE) 1076-0342(2004)10:4(149) Journal of Infrastructure Systems, 10, 4, pp. 149-156, 2004-12-01 Fuzzy-based method to evaluate soil corrosivity for prediction of water main deterioration Sadiq, R.; Rajani, B. B.; Kleiner, Y. Fuzzy-based method to evaluate soil corrosivity for prediction of water main deterioration A fuzzy-based method is proposed to evaluate soil corrosivity from soil properties such as soil resistivity, pH, redox potential, sulfide content and soil type. The fuzzy-based method considers three levels of soil corrosivity, non-corrosive, moderately corrosive and corrosive. This is in contrast to the commonly used 10-point scoring (10-P) method, which has only two classes, corrosive and non-corrosive. Membership functions for each of the soil properties are used to quantify their affinity to the level of soil corrosivity. These membership values form an evaluation matrix from which a weighted vector is developed using pair-wise soil property comparisons. The final classification is determined from the cross product of the weighted vector and the evaluation matrix. Two case studies are examined to validate the application of the proposed fuzzy-based method to predict soil corrosivity and the results are compared to the 10-P method. Both case studies showed that the fuzzy-based method out performed the 10-P method.Key Words: Corrosion, 10-P method, soil corrosivity, fuzzy-based method, water mains.