Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Scaling and internal cracking in wet freeze/thaw testing
Wet freeze/thaw testing (constant contact with liquid during freezing and thawing) gives accelerated absorption ('pumping effect'). Two different types of damage can be observed in such tests: surface scaling (amplified by salt) and internal cracking. Surface scaling and internal cracking were studied in three different wet freeze/thaw test set-ups with minimum temperature - 18 deg C and various cooling rates on a variety of concretes. The purpose was to explore mechanisms controlling scaling and cracking in wet freeze/thaw testing . The results showed that internal cracking ,correlated to the pumping effect. Surface scaling did not correlate so well to the pumping effect even though the same accelerated absorption occurred. Evaporable water content and ice formation increased during wet freeze/thaw. The pumping apparently gives a progressive form of deterioration from surface and inwards following the absorption. The cooling rate affects the dominant type of damage in wet freeze/thaw. Frost/salt scaling is controlled by a mechanism that is promoted by slow cooling rate whereas cracking is controlled by a mechanism that is promoted by fast cooling rate. One wet freeze/thaw test may rank concrete frost resistance, but different wet freeze/thaw tests (slow slab test, rapid beam test) rank concrete frost resistance differently. Service life prediction from wet freeze/thaw test results cannot be performed directly.
Scaling and internal cracking in wet freeze/thaw testing
Wet freeze/thaw testing (constant contact with liquid during freezing and thawing) gives accelerated absorption ('pumping effect'). Two different types of damage can be observed in such tests: surface scaling (amplified by salt) and internal cracking. Surface scaling and internal cracking were studied in three different wet freeze/thaw test set-ups with minimum temperature - 18 deg C and various cooling rates on a variety of concretes. The purpose was to explore mechanisms controlling scaling and cracking in wet freeze/thaw testing . The results showed that internal cracking ,correlated to the pumping effect. Surface scaling did not correlate so well to the pumping effect even though the same accelerated absorption occurred. Evaporable water content and ice formation increased during wet freeze/thaw. The pumping apparently gives a progressive form of deterioration from surface and inwards following the absorption. The cooling rate affects the dominant type of damage in wet freeze/thaw. Frost/salt scaling is controlled by a mechanism that is promoted by slow cooling rate whereas cracking is controlled by a mechanism that is promoted by fast cooling rate. One wet freeze/thaw test may rank concrete frost resistance, but different wet freeze/thaw tests (slow slab test, rapid beam test) rank concrete frost resistance differently. Service life prediction from wet freeze/thaw test results cannot be performed directly.
Scaling and internal cracking in wet freeze/thaw testing
Jacobsen, S. (Autor:in)
1997
9 Seiten, 9 Bilder, 2 Tabellen, 12 Quellen
Aufsatz (Konferenz)
Englisch
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