Durability of biofilm-enriched hybrid mortar towards chemical and physical challenges

•The addition of bacterial biofilm powder induces hydrophobic properties.•The increased wetting resistance survived exposure to almost all tested challenges.•Capillary water uptake is strikingly low even after exposure to harsh conditions.•Hydrophobic hybrid mortar maintains its strength after stora...

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Bibliographic Details
Published in:Materials letters 2022-11, Vol.326, p.132937, Article 132937
Main Authors: Ertelt, M.J., Eicheler, C., Machner, A., Lieleg, O.
Format: Article
Language:English
Subjects:
Bacterial biofilm
Durability
Hybrid mortar
Silica fume
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Summary:•The addition of bacterial biofilm powder induces hydrophobic properties.•The increased wetting resistance survived exposure to almost all tested challenges.•Capillary water uptake is strikingly low even after exposure to harsh conditions.•Hydrophobic hybrid mortar maintains its strength after storage. To increase the service life of cementitious structures, it is important to protect them against penetrating moisture and molecules/ions transported by water ingress. For mortar, such a protection can be achieved by adding bacterial biofilm powder. However, the hydrophobizing effect needs to persist over time – even when the material is exposed to harsh conditions. Here, we show that the hydrophobic properties brought about by the addition of bacterial biofilm powder to mortar are maintained even when the material is challenged with difficult thermal or chemical conditions.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2022.132937