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Tightness of concrete protective structures at cryogenic temperatures
The leakage behavior of concrete structures at cryogenic temperatures was investigated in order to check the tightness of concrete protective structures. Therefore the interrelationship between cold-spot size, crack development and leakage was examined by large scale beams. Parameters of the test were depth of the beam, size of the cooled area and reinforcement ratio. The re-tightening phenomena was examined by small-size cube experiments on two regular mixes (water/cement ratio of 0.4 and 0.55) and one high performance concrete (HPC; water/cement ratio of 0.3) to understand the influence of the parameters mix-composition and crackwidth on leakage through a crack. From the experiments it can be concluded, that all non-compressed separating cracks exhibit leakage. No re-tightening could be observed. Especially at smaller crackwidths/flow-rates, HPC has higher leakage rates than normal concrete due to smooth crack surfaces. A cause for reduced leakage rates can be irregularities of cracks, like branching or overlapping, which make the crack non-separating. If leakage is to be limited to low values, liquid penetration must be prevented by controlling crackwidth to a value around 0.1 mm, depending on structure thickness.
Tightness of concrete protective structures at cryogenic temperatures
The leakage behavior of concrete structures at cryogenic temperatures was investigated in order to check the tightness of concrete protective structures. Therefore the interrelationship between cold-spot size, crack development and leakage was examined by large scale beams. Parameters of the test were depth of the beam, size of the cooled area and reinforcement ratio. The re-tightening phenomena was examined by small-size cube experiments on two regular mixes (water/cement ratio of 0.4 and 0.55) and one high performance concrete (HPC; water/cement ratio of 0.3) to understand the influence of the parameters mix-composition and crackwidth on leakage through a crack. From the experiments it can be concluded, that all non-compressed separating cracks exhibit leakage. No re-tightening could be observed. Especially at smaller crackwidths/flow-rates, HPC has higher leakage rates than normal concrete due to smooth crack surfaces. A cause for reduced leakage rates can be irregularities of cracks, like branching or overlapping, which make the crack non-separating. If leakage is to be limited to low values, liquid penetration must be prevented by controlling crackwidth to a value around 0.1 mm, depending on structure thickness.
Tightness of concrete protective structures at cryogenic temperatures
Wermann, T. (author) / Breugel, K. van (author)
1998
4 Seiten, 3 Bilder, 3 Quellen
Conference paper
English
Tightness of concrete protective structures at cryogenic temperatures
| British Library Conference Proceedings | 1998
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| Engineering Index Backfile | 1903
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Fracture of Concrete at Cryogenic Temperatures
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