[article]
| Titre : |
Biocolonisation of polymer-modified mortars |
| Type de document : |
texte imprimé |
| Auteurs : |
Lucy Travailleur, Auteur ; Marielle Gueguen-Minerbe, Auteur ; Issam Nour, Auteur ; Sandrine Marceau, Auteur ; Emmanuel Keita, Auteur ; Thierry Chaussadent, Auteur |
| Année de publication : |
2020 |
| Article en page(s) : |
10 p. |
| Note générale : |
Bibliogr. |
| Langues : |
Français (fre) |
| Catégories : |
Algues unicellulaires
Biocolonisation
Biodégradation
Composites
Copolymère styrène acrylate
Egouts
Mortier
Polyacryliques
|
| Index. décimale : |
668.9 Polymères |
| Résumé : |
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. However, previous studies performed regarding such materials were carried out on massive pieces and did not consider the interactions between polymer-modified mortars and microorganisms. Nevertheless, such interactions can lead to undesired aesthetical or structural modifications of those materials. As a result, the main objective of this paper is to evaluate the resistance to biocolonisation of polymer-modified mortars applied into thin layers in environmental conditions that are representative of the on-site applications. Two formulations of polymer-modified mortars and a polymer-free mortar are characterised in the hardened state. Then, the resistance of those mortars to biocolonisation is tested by means of two laboratory accelerated tests. The first experiment is performed in order to recreate biofouling at the surface of the specimens, while the second one exposes the materials to biodeterioration. The results and analyses show that in the presence of polymer, both porosity and capillary absorption of mortars are reduced, but this does not allow preventing or slowing down biocolonisation. In addition, this study suggests that the nature of the polymer has an influence on bioreceptivity of polymer-modified mortars. Finally, our results suggest that in the presence of polymer, the global material may have an improved inner cohesion. |
| Note de contenu : |
- MATERIALS AND METHODS : Materials and sample preparation - Hardened mortars characteristisation - Accelerated biocolonisation devices
- RESULTS : Characteristics of hardened mortars - Biofouling of polymer-modified mortars - Biodeterioration of polymer-modified mortars
- Table 1 : Polymer characteristics
- Table 2 : Characteristics of the surface bubbling
- Table 3 : Sorption coefficient, porosity and bulk density of mortars
- Table 4 : Visual evolution of the samples over the experiment and pH range associated
- Table 5 : Profile of the samples after 16 weeks in the biodeterioration chamber
- Table 6 : Visual observation of mortars before and after sonication |
| Référence de l'article : |
305 |
| DOI : |
https://doi.org/10.1051/mattech/2020026 |
| En ligne : |
https://www.mattech-journal.org/articles/mattech/pdf/2020/03/mt190083.pdf |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35635 |
in MATERIAUX & TECHNIQUES > Vol. 108, N° 3 (2020) . - 10 p.
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