Published in Matériaux & Techniques
Polymer-modified mortars are cementitious materials that integrate polymers from 5 to 20 wt.%. Those materials are widely used for protecting and/or repairing concrete surfaces among which building facades, civil engineering structures, or sewage networks. In this context, polymer-modified mortars are applied into thin layers of about 1–3 cm. Howev...
Différentes dégradations des matériaux cimentaires sont observées dans les réseaux d'assainissement. Certaines de ces dégradations sont, par exemple, provoquées par la présence de l'hydrogène sulfuré dans la partie aérienne des canalisations. En effet, des micro-organismes sulfooxydants, constituant en partie le biofilm déposé sur la paroi cimentai...
Mortars based on different compositions (cast with calcium aluminate cement (CAC), ordinary Portland cement (CEM I), blended Portland cement (CEM III, CEM IV, CEM V) and super sulphated cement (SSC)) were exposed to gaseous H2S. The most soluble phases from cement lead to the presence of ions in a water layer formed on the mortar surface and these ...
Published in Materials and Structures
The present study deals with the exposure of four different mortar formulations in the headspace of two distinct sewer networks prone to biodeterioration phenomenon due to the presence of hydrogen sulphide. Cylindrical specimens composed of two cements, ordinary Portland cement (OPC) and calcium aluminate cement (CAC), with or without a substitutio...
Published in Matériaux & Techniques
Concrete deterioration is extensively observed due to hydrogen sulphide emission in sewerage networks. The presence of this gas leads to the development of sulphur-oxidizing bacteria which produce sulphuric acid. Local deterioration of concrete sewer pipes, based on dissolution-precipitation mechanisms and the formation of ettringite and gypsum, de...
Published in The Science of the total environment
Incorporation of living organisms, such as photosynthetic organisms, on the structure envelope has become a priority in the area of architecture and construction due to aesthetical, economic and ecological advantages. Important research efforts are made to achieve further improvements, such as for the development of cementitious materials with an e...
Les recommandations actuelles de la norme FD P18-011 préconisent de protéger le béton lorsque les conditions d'exposition chimique excèdent certains seuils. Dans le cas des ouvrages d'assainissement soumis à la biocorrosion initiée par la présence d'H2S, cette norme préconise l'application de reÐtement pour protéger le béton lorsque les seuils maxi...
For over 50 years, synthetic petrochemical-based plastics have been produced in ever growing volumes globally and since their first commercial introduction; they have been continually developed with regards to quality, colour, durability, and resistance. With some exceptions, such as polyurethanes, most plastics are very stable and are not readily ...
