Einfluss des Feuchtigkeitsgehaltes auf das kapillare Saugen / Influence of Moisture Content on Capillary Suction
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P. Primi
Abstract
Some surface treatments such as hydrophobing and realcalisation rely on capillary suction as the driving force. In this context, the critical admissible moisture content must be known. The porous structure of a series of different building materials has been characterized. The porosity and pore size distribution has been determined on 3 different types of autoclaved aerated concrete (AAC), on samples made of hardened cement paste with 3 different water-cement ratios, on natural sandstone and on burned brick. The sorption isotherm and at each equilibrium moisture content the remaining capillary suction has been measured on identical specimens. It can be shown that capillary suction of materials with a coarse porous structure such as sandstone or burnt brick depends slightly only on the moisture content Capillary suction of hardened cement paste with a fine porous system, in contrast, is drastically diminished with increasing moisture content and reaches negligible values near 100 % RH. Results presented in this contribution allow us to fix a critical admissible moisture content for different building materials. At the same time, building materials can be identified for which the moisture content has to be carefully controlled before surface treatment is to be applied It must be mentioned, however, that in critical cases the moisture profile must be determined up to the intended depth of the treatment instead of the surface moisture content.
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Artikel in diesem Heft
- Inhalt / Contents
- Impressum
- Editorial
- Beiträge aus Forschung und Praxis / Contributions from Research and Practice
- Krustenbildung, ein schützender und zerstörender Vorgang: eine Fallstudie am "Reials Col.legis" (16. Jahrhundert, Katalanien, Spanien) / Patination as a Constructive and Destructive Process: The Case of "Reials Col.legis" (16th Century, Catalonia, Spain).
- PROGNOS, ein Programm zur Prognose von Eindringtiefen bei der Applikation von SteinschutzstofTen auf Naturstein / PROGNOS, a program to predict the penetration depth of conserving fluids in natural stone
- Feuchtetransport über Materialgrenzen im Mauerwerk / Moisture transport through interfaces in masonry
- Können wir die weltweite Klimaveränderung durch Heizenergieeinsparung im Bauwesen noch stoppen? / Are we able to stop the global climatic change through heating energy economy in building construction?
- Einfluss des Feuchtigkeitsgehaltes auf das kapillare Saugen / Influence of Moisture Content on Capillary Suction
- Umweltverträglichkeit von Betonzusatzmitteln / Environmental Impact of Superplasticizers
- WTA-Mitteilungen / WTA News
- Neue WTA-Merkblätter / New WTA Recommendations
- Kleiner Veranstaltungskalender / Calendar of Events
Artikel in diesem Heft
- Inhalt / Contents
- Impressum
- Editorial
- Beiträge aus Forschung und Praxis / Contributions from Research and Practice
- Krustenbildung, ein schützender und zerstörender Vorgang: eine Fallstudie am "Reials Col.legis" (16. Jahrhundert, Katalanien, Spanien) / Patination as a Constructive and Destructive Process: The Case of "Reials Col.legis" (16th Century, Catalonia, Spain).
- PROGNOS, ein Programm zur Prognose von Eindringtiefen bei der Applikation von SteinschutzstofTen auf Naturstein / PROGNOS, a program to predict the penetration depth of conserving fluids in natural stone
- Feuchtetransport über Materialgrenzen im Mauerwerk / Moisture transport through interfaces in masonry
- Können wir die weltweite Klimaveränderung durch Heizenergieeinsparung im Bauwesen noch stoppen? / Are we able to stop the global climatic change through heating energy economy in building construction?
- Einfluss des Feuchtigkeitsgehaltes auf das kapillare Saugen / Influence of Moisture Content on Capillary Suction
- Umweltverträglichkeit von Betonzusatzmitteln / Environmental Impact of Superplasticizers
- WTA-Mitteilungen / WTA News
- Neue WTA-Merkblätter / New WTA Recommendations
- Kleiner Veranstaltungskalender / Calendar of Events
