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Sur les origines du retrait et du fluage du béton
Recent experimental results (creep tests and indentation tests at a nanometric scale) on Ductal®, a non-brittle (fibre-reinforced) ultrahigh-performance concrete (UHPC), show that only one constituent of this composite, the C·S·H phase, exhibits creep. Former creep tests on hydrated cement paste have shown a very high creep rate of C·S·H which decelerates much more slowly than concrete creep. Furthermore, these results provide an explanation for the observations of a strong correlation between shrinkage and creep values. The reason is, when hydration rate becomes negligible (after a few weeks), the dominant part of shrinkage is nothing but the viscoplastic response of C·S·H to the internal stress which is applied by the liquid phase on the pore surface. This statement make wrong the last argument against the explanation of shrinkage by capillary tension, the so-called argument of reversibility. Creep aging, as well as the very low creep of high-strength concrete can be explained by the consumption of creep potential by the hygral stress. Several coupling effects between creep and shrinkage can be explained, as for example the so-called Pickett effect.
Sur les origines du retrait et du fluage du béton
Recent experimental results (creep tests and indentation tests at a nanometric scale) on Ductal®, a non-brittle (fibre-reinforced) ultrahigh-performance concrete (UHPC), show that only one constituent of this composite, the C·S·H phase, exhibits creep. Former creep tests on hydrated cement paste have shown a very high creep rate of C·S·H which decelerates much more slowly than concrete creep. Furthermore, these results provide an explanation for the observations of a strong correlation between shrinkage and creep values. The reason is, when hydration rate becomes negligible (after a few weeks), the dominant part of shrinkage is nothing but the viscoplastic response of C·S·H to the internal stress which is applied by the liquid phase on the pore surface. This statement make wrong the last argument against the explanation of shrinkage by capillary tension, the so-called argument of reversibility. Creep aging, as well as the very low creep of high-strength concrete can be explained by the consumption of creep potential by the hygral stress. Several coupling effects between creep and shrinkage can be explained, as for example the so-called Pickett effect.
Sur les origines du retrait et du fluage du béton
Acker, Paul (author)
Revue Française de Génie Civil ; 7 ; 761-776
2003-06-01
16 pages
Article (Journal)
Electronic Resource
Unknown
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