Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Frost resistance of prefabricated facade element
In the production of facade elements an effective compaction of concrete is used. Therefore, there is a risk for escape of the air voids, which may have a detrimental effect on frost resistance of the element. The stability of the air-void system in the pre-fabricated facade element was analyzed in a comprehensive experimental test series. The test results proved that some air escapes from fresh concrete during the compaction of facade elements. On the average, the air content of hardened concrete was 0.8 percentage unit lower than that of fresh concrete. Besides, the air is moving inside the concrete due to the compaction. The air content of the mould surface (30 mm layer) was, on the average, 0.8 percentage unit lower than that of the back surface (30 mm layer). The compacting power (compaction time) also affected the difference between the mould surface and the back surface. Although some air escaped from fresh concrete due to the compaction, the frost resistance of the concrete was not affected significantly. The thin section analyses showed that the content of the largest pores (compaction pores; > 0.8 mm) was higher in the back surface and it was affected by the compacting power. However, the quantity and the quality of the air-voids essential to frost resistance (protective pores; < 0.8 mm) were not affected significantly by compaction. The test results also showed that the present production ensures a good frost resistance for facade elements. With a proper air-entraining, the air-void system is not sensitive to the compaction of the concrete.
Frost resistance of prefabricated facade element
In the production of facade elements an effective compaction of concrete is used. Therefore, there is a risk for escape of the air voids, which may have a detrimental effect on frost resistance of the element. The stability of the air-void system in the pre-fabricated facade element was analyzed in a comprehensive experimental test series. The test results proved that some air escapes from fresh concrete during the compaction of facade elements. On the average, the air content of hardened concrete was 0.8 percentage unit lower than that of fresh concrete. Besides, the air is moving inside the concrete due to the compaction. The air content of the mould surface (30 mm layer) was, on the average, 0.8 percentage unit lower than that of the back surface (30 mm layer). The compacting power (compaction time) also affected the difference between the mould surface and the back surface. Although some air escaped from fresh concrete due to the compaction, the frost resistance of the concrete was not affected significantly. The thin section analyses showed that the content of the largest pores (compaction pores; > 0.8 mm) was higher in the back surface and it was affected by the compacting power. However, the quantity and the quality of the air-voids essential to frost resistance (protective pores; < 0.8 mm) were not affected significantly by compaction. The test results also showed that the present production ensures a good frost resistance for facade elements. With a proper air-entraining, the air-void system is not sensitive to the compaction of the concrete.
Frost resistance of prefabricated facade element
Frostbeständigkeit vorgefertigter Fassadenbauteile
Punkki, J. (Autor:in) / Juvas, K. (Autor:in)
2000
6 Seiten, 6 Tabellen, 3 Quellen
Aufsatz (Konferenz)
Englisch
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