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Influence des caractéristiques intrinsèques d’un mortier sur son encrassement biologique

Abstract : Biofouling of wall coatings is an aesthetic and economic problem. Among microorganisms involved, the algae are the most involved. This work aimed to study experimentally the influence of intrinsic parameters (porosity, roughness and carbonation) of a cement-based mortar on its bioreceptivity and to model the development of algae.To study the algal biodegradation, an accelerated laboratory test was developed. This work was carried out with the green alga Klebsormidium flaccidum frequently identified in samples taken on colonized facades. The results show that an increase in roughness and a decrease in surface pH by carbonation of mortars promote fouling by algae.A model based on Avrami's law was used to simulate the algal colonization. Two processes involved in the mechanism of colonization: the attachment (or "germination") and the growth of algae. The kinetic parameters representing these processes have been determined and reveal the importance of the roughness and the carbonation on the constant rate of "germination".Exposure of samples in nature was also carried out. The results obtained allow recovering partially the behavior of materials in the laboratory test even if the start of colonization seems to be affected by weather conditions.
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Thu Hien Tran. Influence des caractéristiques intrinsèques d’un mortier sur son encrassement biologique. Autre. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. Français. ⟨NNT : 2011EMSE0626⟩. ⟨tel-00718250⟩

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