Etude des mécanismes de biodégradation du matériau béton pour une optimisation de la durabilité des réseaux d'assainissement - Archive ouverte HAL Access content directly
Other Publications Year : 2009

Etude des mécanismes de biodégradation du matériau béton pour une optimisation de la durabilité des réseaux d'assainissement

Abstract

Concretes in sewer systems are exposed to a very aggressive environment. Indeed, the effluents contain organic and inorganic sulphur compounds allowing to be consumed by sulphur-reducing bacteria to form hydrogen sulphide. Gaseous hydrogen sulphide, which condenses on the emerged walls, is oxidized by sulphur-oxidizing bacteria in sulphuric acid form. The deterioration of the concrete structure is due to the combined effects of various mechanisms of degradation. The physico-chemical mechanisms involve cracks in concretes and corrosion of reinforcing steel leading to the irreversible damage of the sewer system. To overcome these degradations, but also to limit hydrogen sulphide formation (which is an extremely toxic and odorous gas), managers have some solutions based on oxygenation of the effluents, addition of ferrous salts in the effluents,... When the concrete is deteriorated, solutions consist in repairing or replacement of concrete by new resisting concrete or polymeric materials. Nevertheless, all of these solutions are not completely effective if the global process is not considered. To respond to requests concerning the choice of adequate materials for a given environment and a defined process, the purpose of this work is to study mechanisms of biodegradation on concrete and to consider the durability of both the materials and the sewer systems. Propositions for new solutions limiting materials degradation are also exposed.

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Dates and versions

hal-00428638 , version 1 (29-10-2009)

Identifiers

  • HAL Id : hal-00428638 , version 1

Cite

Thierry Chaussadent, Frédéric Boinski, Eric D. van Hullebusch, Patrice Chatellier. Etude des mécanismes de biodégradation du matériau béton pour une optimisation de la durabilité des réseaux d'assainissement. 2009. ⟨hal-00428638⟩
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