Greening Concrete with biofilms: Codesigning with nature

  • uilding envelopes act as artificial lithic surfaces and natural substrates for subaerial biofilms, whose establishment depends on surface bioreceptivity. This study investigates how concrete cladding can be engineered to support microalgae‑dominated biofilms. A multi‑stage experimental framework—ranging from petri‑dish cultivation and adhesion testing to laboratory weathering simulations and outdoor exposure—was applied. A reproducible dual alga–fungus model biofilm enabled controlled assessment, with algal vitality quantified using PAM fluorometry. Results identify pH and carbonation as primary determinants of successful colonization, while nutrient addition has only minor influence. Adhesion tests show that moderate stress can enhance resilience to hydrodynamic forces. Rain‑simulation experiments highlight the importance of surface texture and near‑surface porosity for water retention, microbial attachment, and sustained growth. A synergistic interaction between algae and fungiuilding envelopes act as artificial lithic surfaces and natural substrates for subaerial biofilms, whose establishment depends on surface bioreceptivity. This study investigates how concrete cladding can be engineered to support microalgae‑dominated biofilms. A multi‑stage experimental framework—ranging from petri‑dish cultivation and adhesion testing to laboratory weathering simulations and outdoor exposure—was applied. A reproducible dual alga–fungus model biofilm enabled controlled assessment, with algal vitality quantified using PAM fluorometry. Results identify pH and carbonation as primary determinants of successful colonization, while nutrient addition has only minor influence. Adhesion tests show that moderate stress can enhance resilience to hydrodynamic forces. Rain‑simulation experiments highlight the importance of surface texture and near‑surface porosity for water retention, microbial attachment, and sustained growth. A synergistic interaction between algae and fungi under stress conditions may explain the poor outdoor performance of biofilms cultivated under ideal laboratory conditions. Overall, optimizing photosynthetic efficiency, organismal growth, and adhesion strength is essential for developing durable algal biofilm‑based façade systems.zeige mehrzeige weniger

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Metadaten
Autor*innen:Julia von WerderORCiD
Koautor*innen:Leonie StohlORCiD, Jake CookORCiD, Chiara TononORCiD
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:4 Material und Umwelt
4 Material und Umwelt / 4.0 Abteilungsleitung und andere
7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.1 Baustoffe
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Sanitär- und Kommunaltechnik; Umwelttechnik
Freie Schlagwörter:Biofilm; Bioreceptivity; Concrete; Fluorometry; Laboratory test
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Green Intelligent Building
Umwelt
Umwelt / Umwelt-Material-Interaktionen
Veranstaltung:4th International Conference of Sustainable Building Materials
Veranstaltungsort:Eindhoven, The Netherlands
Beginndatum der Veranstaltung:10.08.2025
Enddatum der Veranstaltung:13.08.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:02.02.2026
Referierte Publikation:Nein
Eingeladener Vortrag (wissenschaftliche Konferenzen):Nein
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