Frost‐Tausalz‐Angriff auf Beton

Müller, Matthias; Ludwig, Horst‐Michael; Ehrhardt, Dirk

doi:10.1002/best.201800096

Cited by 7 publications

(8 citation statements)

References 18 publications

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“…deutlich unterhalb von 0 °C [10]. Bei den Mechanismen unterscheidet man zwischen denen, die makroskopische Spannungen nach sich ziehen, und jenen, die Veränderungen im mikroskopischen Zementsteingefüge bewirken [11,12]. Hochleistungsbetone mit niedrigem w/z-Wert weisen generell einen hohen Widerstand gegen Frostschäden auf [13].…”

Section: Aufsatz Articleunclassified

Untersuchungen zur Frostbeanspruchung geneigter Oberflächen aus hochfestem Spritzbeton

Stelzmann

Lägel

Kahnt

et al. 2023

Beton und Stahlbetonbau

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Im Experimentalgebäude CUBE – einem Leuchtturmprojekt des Carbonbetonbaus – sind zwei doppeltgekrümmte Bauteile aus Spritzbeton sichtbar ausgeführt worden, woraus sich erhöhte Anforderungen an dessen Optik und besonders an die Sichtbetonqualität der Gebäudehülle ergeben. Eine Besonderheit besteht in der Herstellungstechnologie der Schalentragwerke aus Spritzbeton. Aufgrund der besonderen Formgebung der Bauteile ergeben sich erhöhte Feuchtebeanspruchungen und daraus resultierende Schadenspotenziale durch Frost. In rechnerischen Untersuchungen zeigen sich deutlich erhöhte Frostbeanspruchungen von geneigten Sichtbetonflächen gegenüber Wandflächen. Die allgemein höheren Wassergehalte geneigter Betonflächen führen dazu, dass das in den Porenräumen enthaltene Wasser bereits bei Temperaturen knapp unter 0 °C gefriert. Bei Wandflächen wird das enthaltene Wasser häufiger in sehr feinen Poren gespeichert. Der hier vorherrschende Kapillardruck führt dazu, dass Eis erst bei Temperaturen unter –20 °C entsteht.

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Section: Aufsatz Articleunclassified

Untersuchungen zur Frostbeanspruchung geneigter Oberflächen aus hochfestem Spritzbeton

Stelzmann

Lägel

Kahnt

et al. 2023

Beton und Stahlbetonbau

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“…This resulted in 12 different cements in total. The concretes for the CDF tests were produced with a w/c-ratio of 0.50 and a target air void content of 5.0 vol.% at a maximum grain size of 16 mm (also see [25]). The capillary porosity of the HCP was characterized by the amount of freezable water in the range to -20 °C.…”

Section: Capillary Porosity Vs Salt Frost Scaling Resistance With Por...mentioning

confidence: 99%

“…According to the "cryogenic suction" theory [17,18], the latter is the key mechanism for the generation of scaling damage (c.f. [25] for details), as the absorbed salt solution can promote the ice growth in concrete. The HCP that was allowed to carbonate in standard climate contains a notably higher amount of freezable water (0.068 g/g) than the sample which was protected from carbonation (0.020 g/g).…”

Section: Impact Of Carbonation On Freezing Behaviormentioning

confidence: 99%

The peculiar behaviour of low‐carbon concretes under salt frost exposure

Müller,

Ludwig,

Ehrhardt

et al. 2023

ce papers

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Since the early days of concrete construction, the deterioration of concrete due to the combined action of frost, water and de‐icing salts had been observed. This salt frost attack is typically associated with surface scaling. The underlying mechanism for that damage was unresolved for many decades and many conflicting damage theories exist. In the past, that knowledge gap was primarily of academic interest, as a good salt frost scaling resistance of clinker rich concretes was easily achieved with air entrainment. However, as that approach increasingly reaches its limit for “low‐carbon concretes”, an in‐depth knowledge of the damage mechanisms can help to identify alternative measures to ensure good salt frost scaling resistance of such concretes. Based on a novel theory, which can explain important characteristics of salt frost attack and the generation of scaling damage, an additional cause for the unfavourable influence of clinker reduction on salt frost resistance were identified.

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“…In case of concrete used in infrastructural applications, this is a crucial environmental impact. Various models are available to explain different aspects of frost damage and its causes 31 . A prerequisite for frost damage is saturation of the concrete with the de‐icing salt solution.…”

Section: Rehabilitation Of Road Surface Using Textile‐reinforced Conc...mentioning

confidence: 99%

“…Various models are available to explain different aspects of frost damage and its causes. 31 A prerequisite for frost damage is saturation of the concrete with the de-icing salt solution. This occurs through the absorption of the de-icing salt solution from the surface during freezing.…”

Section: Frost Scaling Of Concretementioning

confidence: 99%

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Konzilia

Egger

Feix

2022

Structural Concrete

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With the aim of reducing life cycle costs and dead weight, there are various concepts for replacing bridge pavements and sealants with high‐performance concrete. The corrosion resistance of textile reinforcements allows the realization of thin reinforcement layers that fulfill this objective. However, the textile‐reinforced concrete used as a road surface must meet the particular requirements relating to frost resistance and, specifically, scaling. An investigation on an existing structure indicated the influence of textile reinforcements on frost resistance. Therefore, the present investigations focus on the frost scaling of different combinations of a carbon reinforcement and fine‐grained concrete. For this purpose, a multistage research design is used. First, the influence of the reinforcement and the concrete mix on the capillary porosity is investigated. The capillary porosity of concrete is directly related to its resistance to freeze–thaw scaling. This resistance is examined using the slab‐test method. Finally, the influence of the frost exposure on the pull‐off strength, which is crucial for the strengthening of structures, is determined.

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Frost‐Tausalz‐Angriff auf Beton

Cited by 7 publications

References 18 publications

Untersuchungen zur Frostbeanspruchung geneigter Oberflächen aus hochfestem Spritzbeton

Untersuchungen zur Frostbeanspruchung geneigter Oberflächen aus hochfestem Spritzbeton

The peculiar behaviour of low‐carbon concretes under salt frost exposure

Experimental investigation on salt frost scaling of textile‐reinforced concrete

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