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Validierung zerstörungsfreier Messmethoden zur zuverlässigen Erfassung von Bewehrungskorrosion (Schlussbericht)

  • Determining a pore structure’s mechanical and chemical data on lime rendering exposed outdoors and including masonry in the laboratory, with regard to their behaviour on moisture transport and weathering was the objective. In search of clues for a dose-response relation - i.e. upon a connection between the emission rate of SO2 and NOx on one hand and the degree of damage to mainly plaster having a lime component on the other - it has been of interest to what extent their structural characteristics including pore space are modified and so consequently also physico-technical properties and chemical composition. For determining corresponding criteria, a widely diversified spectrum of test methods such as to obtain data concerning porosity and moisture transport, mechanical behaviour, and chemistry as well is available. A description of the manufacture of plate-shaped rendering specimens with lime putty, industrially hydrated lime and dolomitic hydrate (the last two also having a cementDetermining a pore structure’s mechanical and chemical data on lime rendering exposed outdoors and including masonry in the laboratory, with regard to their behaviour on moisture transport and weathering was the objective. In search of clues for a dose-response relation - i.e. upon a connection between the emission rate of SO2 and NOx on one hand and the degree of damage to mainly plaster having a lime component on the other - it has been of interest to what extent their structural characteristics including pore space are modified and so consequently also physico-technical properties and chemical composition. For determining corresponding criteria, a widely diversified spectrum of test methods such as to obtain data concerning porosity and moisture transport, mechanical behaviour, and chemistry as well is available. A description of the manufacture of plate-shaped rendering specimens with lime putty, industrially hydrated lime and dolomitic hydrate (the last two also having a cement admixture) and also hydraulic lime as binding agents is included. First deposition velocity and absorption rate for SO2 were determined in laboratory tests on these materials in dry and moist states. After their exposure on outdoor racks at six locations in the Berlin region with differing SO2 atmospheric contents over at least 5 years, the samples of course show timedependent modifications of chemical and physical qualities which are especially reflected in the form of profiles of structure, strength and concentration, e.g. for sulphate. Local climatic differences, however, partly exert a greater influence on material than emissions. Similar investigations were performed on samples of comparable composition exposed 4 and 17 years. But the real surprise is furnished by the renderings’ behaviour depending upon orientation and upon height at a building. Since weathering behaviour and moisture Transport (absorption, storage, release) are directly interdependent, further criteria are necessary for a critical assessment of a plasters’ pore structure. Starting from sands, plasters were characterized. The structural parameters were lastly influenced by the respective contents of sand, binder and mixing water. These results and those gained from bricks naturally find their expression in masonry sections manufactured there from, and above all in their capillary and evaporative behaviours, and also when applying different test liquids. Summary and cited literature is given at the end of this report.zeige mehrzeige weniger

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Metadaten
Autor*innen:Gino EbellORCiD, Andreas Burkert, C. Gehlen, S. Keßler
Dokumenttyp:Forschungsbericht
Veröffentlichungsform:Graue Literatur
Sprache:Deutsch
Jahr der Erstveröffentlichung:2011
Veröffentlichende Institution:Bundesanstalt für Materialforschung und -prüfung (BAM)
Verlag:Bundesanstalt für Materialforschung und -prüfung (BAM) / Technische Universität München
Erste Seite:1
Letzte Seite:92
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Betonstahl; Korrosion; Merkblatt B 3; Potential mapping; Potentialfeldmessung; Stahlbeton
URN:urn:nbn:de:kobv:b43-336229
Verfügbarkeit des Dokuments:Datei für die Öffentlichkeit verfügbar ("Open Access")
Bibliotheksstandort:Standort: BAM-6.1
Lizenz (Deutsch):License LogoAllgemeines Deutsches Urheberrecht
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
Schriftenreihen ohne Nummerierung:BAM Forschungsberichte ohne Nummerierung
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