A silica-based protective system modified with rock powder for the preservation of tuff stone

  • Tuffs are lightweight and porous pyroclastic rocks composed of a volcanic ash matrix containing pumice and rock fragments, quartz, sanidine and other individual crystals, zeolites, and clay minerals. Due to their low density and high porosity, tuff stones are easy to work with and transport. They have been used as construction material in many historical buildings in Germany. However, most tuff stones exhibit poor resistance to weathering due to their morphology and porosity. If the physico-chemical degradation of the stones is already well advanced, ensuring the safety of the buildings often requires extensive stone replacement. However, this contradicts the fundamental principle of conservation, which prioritises the preservation of the original material. In a recently completed research project, a silica-based protective system modified with rock powder was developed for the preservation of tuff stone. Suitable colloidal silica dispersions and modified rock powders customisedTuffs are lightweight and porous pyroclastic rocks composed of a volcanic ash matrix containing pumice and rock fragments, quartz, sanidine and other individual crystals, zeolites, and clay minerals. Due to their low density and high porosity, tuff stones are easy to work with and transport. They have been used as construction material in many historical buildings in Germany. However, most tuff stones exhibit poor resistance to weathering due to their morphology and porosity. If the physico-chemical degradation of the stones is already well advanced, ensuring the safety of the buildings often requires extensive stone replacement. However, this contradicts the fundamental principle of conservation, which prioritises the preservation of the original material. In a recently completed research project, a silica-based protective system modified with rock powder was developed for the preservation of tuff stone. Suitable colloidal silica dispersions and modified rock powders customised produced from tuff waste were used. The protective system was optimised to reduce the capillary water absorption of tuff while maintaining its water vapour diffusion properties, to build a durable protective system-tuff bond, and to achieve a visual and tactile resemblance to tuff. The protective system was developed at laboratory scale. It was subsequently applied to a test area at a restoration site in Berlin-Zehlendorf, Germany, to assess its performance under outdoor conditions. By applying the new protective system, the historic building structure is better preserved, tuff stone resources are saved, and tuff waste is effectively recycled.zeige mehrzeige weniger

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  • Ruebner et al_STONE 2025 Volume 2.pdf
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Autor*innen:Katrin RübnerORCiD, Maria Stuff, Karsten Großmann, Nicole Pniok, Bianca Dreisow
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):STONE 2025 - Proceedings of the 15th international congess on the deterioration and conservation of stone
Jahr der Erstveröffentlichung:2025
Organisationseinheit der BAM:7 Bauwerkssicherheit
7 Bauwerkssicherheit / 7.4 Baustofftechnologie
Erste Seite:743
Letzte Seite:749
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurbau
Freie Schlagwörter:Protective system; Rock powder; Silica sol; Stone preservation; Tuff stone; Tuff waste recycling
Themenfelder/Aktivitätsfelder der BAM:Infrastruktur
Infrastruktur / Green Intelligent Building
Veranstaltung:STONE 2025 - 15th international congess on the deterioration and conservation of stone
Veranstaltungsort:Paris, France
Beginndatum der Veranstaltung:08.09.2025
Enddatum der Veranstaltung:12.09.2025
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.11.2025
Referierte Publikation:Nein
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