Development of a reproducible, representative and accelerated biogenic corrosion test to reach sustainable structures in sewer networks
HERISSON ; GUEGUEN MINERBE ; CHAUSSADENT ; VAN HULLEBUSCH
Type de document
COMMUNICATION AVEC ACTES INTERNATIONAL (ACTI)
Langue
anglais
Auteur
HERISSON ; GUEGUEN MINERBE ; CHAUSSADENT ; VAN HULLEBUSCH
Résumé / Abstract
Cementitious materials biodeterioration in sewer networks is an important problem for sewer networks managers. This deterioration process is due to the implication of two biofilm involved in the sulfur cycle. Microorganisms of the first biofilm will reduce sulfate and organic sulfur compounds into H2S in the effluent and then, the second biofilm oxidizes it into sulfuric acid in the structure headspace. This biogenic acid usually leads to the cementitious matrix dissolution. However, cementitious materials do not equivalently face biogenic acid attack. In very aggressive conditions, those made of ordinary Portland cement are highly deteriorated while those based on calcium aluminate cement show good on-site performances. So far, only chemical testing standard procedures are available to predict service life of materials intended for sewer networks but they are not representative of the phenomenon because they do not consider microbial development. Nowadays, it is necessary to develop a new test that could be standardiable involving microorganisms. Such a test has been developed at Ifsttar and provides interesting results.
