Influence of the intrinsic characteristics of mortars on their biofouling by pigmented organisms: Comparison between laboratory and field-scale experiments.

Thu Hien Tran (1) , Alexandre Govin (2, 3, 4) , René Guyonnet (2, 3, 4) , Philippe Grosseau (2, 3, 4) , Christine Lors (5, 6, 7) , Denis Damidot (6, 5) , Olivier Devès (8, 9) , Bertrand Ruot (8, 9)

1 DCE - Department of Civil Engineering
2 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
3 PROPICE-ENSMSE - Département PROcédés Poudres, Interfaces, Cristallisation et Ecoulements
4 LGF-ENSMSE - Laboratoire Georges Friedel
5 LGCgE - Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515
6 Université de Lille
7 CERI MP - IMT Nord Europe - Centre for Materials and Processes
8 CSTB - Centre Scientifique et Technique du Bâtiment
9 Université Paris Est

Biodeterioration of mortars by the photosynthetic microorganisms is affected by their intrinsic properties such as porosity, roughness and surface pH. The influence of these parameters was examined using an accelerated fouling test in laboratory and a natural fouling test in the real-world ( in situ). Based on color measurement and image analysis, the impact of each intrinsic parameter was evaluated. The results differed from a scale to the other one. No influence of porosity was measured on the algal colonization rate in the laboratory test whereas, a high porosity seemed to increase slightly the bioreceptivity of the mortars exposed outdoor. The roughness, in both tests, promoted the microbial colonization. However, the discrimination of roughness grades was better in the laboratory test than in the in situ one. The surface pH influenced remarkably on the accelerated biofouling test but not on the in situ one. These dissimilarities resulted from the differences in experimental configurations of the two tests.

Mots clés: Mortar; Biofouling; Intrinsic properties; Laboratory test; <i>In situ</i> test

Domaines: Génie des procédés

Thu Hien Tran, Alexandre Govin, René Guyonnet, Philippe Grosseau, Christine Lors, et al.. Influence of the intrinsic characteristics of mortars on their biofouling by pigmented organisms: Comparison between laboratory and field-scale experiments.. International Biodeterioration and Biodegradation, 2014, 86 (Part C), pp.334-342. ⟨10.1016/j.ibiod.2013.10.005⟩. ⟨hal-00908332⟩