Avrami's law based kinetic modeling of colonization of mortar surface by alga Klebsormidium flaccidum

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

1 SPIN-ENSMSE - Centre Sciences des Processus Industriels et Naturels
2 PROPICE-ENSMSE - Département PROcédés Poudres, Interfaces, Cristallisation et Ecoulements
3 LGF-ENSMSE - Laboratoire Georges Friedel
4 Université Lille Nord de France (COMUE)
5 CERI MP - IMT Nord Europe - Centre for Materials and Processes
6 CSTB - Centre Scientifique et Technique du Bâtiment
7 Université Paris Est

The aim of this research was to modelize the colonization of mortar surface by green algae using Avrami's law. The resistance of mortars, with different intrinsic characteristics (porosity, roughness, carbonation state), to the biofouling was studied by means of an accelerated lab-scale test. A suspension of green alga Klebsormidium flaccidum, was performed to periodically sprinkle the mortar surfaces. The covered surface rate followed a sigmoidal type curve versus time. Moreover, in order to apply Avrami's law, the algal colonization has been described by two processes: attachment and growth of algal cells. The image analysis showed that both the roughness and the carbonation influenced the algal attachment, unlike the porosity. The attachment specific rate increased linearly with time. For the algal growth process, it's difficult to conclude on the influence of mortar characteristics due to a high dispersion of experimental results. However, the assumption of a constant growth rate was acceptable. A good agreement between the simulation and the experimental results was obtained.

Mots clés: Modeling; Avrami's law; Biological colonization; Algae; Mortar

Domaines: Génie des procédés

Thu Hien Tran, Alexandre Govin, René Guyonnet, Philippe Grosseau, Christine Lors, et al.. Avrami's law based kinetic modeling of colonization of mortar surface by alga Klebsormidium flaccidum. International Biodeterioration and Biodegradation, 2013, 79, pp.73-80. ⟨10.1016/j.ibiod.2012.12.012⟩. ⟨hal-00804718⟩