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Biogenic sulfuric acid attack on different types of commercially produced concrete sewer pipes / Ma. Guadalupe D. Gutiérrez-Padilla in Cement and concrete research, Vol. 40 N° 2 (02 ex.) (Fevrier 2010) 

Public ISBD [article]  in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 293-301 Titre : Biogenic sulfuric acid attack on different types of commercially produced concrete sewer pipes Type de document : texte imprimé Auteurs : Ma. Guadalupe D. Gutiérrez-Padilla, Auteur ; Angela Bielefeldt, Auteur ; Serguei Ovtchinnikov, Auteur Année de publication : 2010 Article en page(s) : pp. 293-301 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Microbial  activity  Sulfate  attack  Degradation  Waste  management Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Laboratory experiments were conducted to compare the degradation of low and high quality concrete under conditions simulating sewer pipes with and without bacteria. Small concrete samples were exposed to hydrogen sulfide, multiple species of bacteria found in corroding sewer pipes and artificial wastewater. Experiments without bacteria were used as controls. The corrosion rates of the concrete samples exposed to bacteria over 227 days were 0.08 mm/yr (millimeters per year) for the concrete from a domestic manufacturer with moderate strength and a lower water–cement ratio (Low-w/c) versus 0.208 mm/yr for the concrete samples from a foreign country with low strength and a higher water–cement ratio (High-w/c). The (Low-w/c) concrete was more resistant to the biodegradation even though a lower pH was attained for its bioactive systems. Experiments showed the influence of biogenic sulfuric acid production on short term corrosion rates. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XMK21Y-1&_user=6 [...] [article] Biogenic sulfuric acid attack on different types of commercially produced concrete sewer pipes [texte imprimé] / Ma. Guadalupe D. Gutiérrez-Padilla, Auteur ; Angela Bielefeldt, Auteur ; Serguei Ovtchinnikov, Auteur . - 2010 . - pp. 293-301. Génie Civil Langues : Anglais (eng) in Cement and concrete research > Vol. 40 N° 2 (02 ex.) (Fevrier 2010) . - pp. 293-301 Mots-clés : Microbial  activity  Sulfate  attack  Degradation  Waste  management Index. décimale : 691 Matériaux de construction. Pièces et parties composantes Résumé : Laboratory experiments were conducted to compare the degradation of low and high quality concrete under conditions simulating sewer pipes with and without bacteria. Small concrete samples were exposed to hydrogen sulfide, multiple species of bacteria found in corroding sewer pipes and artificial wastewater. Experiments without bacteria were used as controls. The corrosion rates of the concrete samples exposed to bacteria over 227 days were 0.08 mm/yr (millimeters per year) for the concrete from a domestic manufacturer with moderate strength and a lower water–cement ratio (Low-w/c) versus 0.208 mm/yr for the concrete samples from a foreign country with low strength and a higher water–cement ratio (High-w/c). The (Low-w/c) concrete was more resistant to the biodegradation even though a lower pH was attained for its bioactive systems. Experiments showed the influence of biogenic sulfuric acid production on short term corrosion rates. DEWEY : 620.13 ISSN : 0008-8846 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TWG-4XMK21Y-1&_user=6 [...]