Abstract
Model for practical prediction of creep and shrinkage of normal strength concrete, developed previously, is extended to high strength concrete. It is found that only a minor adjustment for the concrete strength effect is needed in the formulas for drying creep. The formulas for basic creep and shrinkage need no adjustment. The prediction model is compared with test data for creep and shrinkage obtained recently by Ngab, Nilson and Slate, and by Collepardi, Corradi and Valente, and a satisfactory agreement is demonstrated. The coefficient of variation of the deviations from test data is not larger than that for the normal cient of variation of the deviations from test data is not larger than that for the normal strength range. However, the existing data are rather limited and further testing is desirable.
Résumé
On a étendu au béton à haute résistance le modèle élaboré précédemment pour le béton de résistance normale. On s'est aperçu qu'il suffisait d'apporter dans les formules de fluage au séchage une légère correction pour l'effet de résistance du béton. Les formules de fluage de base et de retrait ne nécessitent pas d'adaptation. On compare le modèle de prévision avec les données d'essais récement obtenues pour le fluage et le retrait par Ngab, Nilson et Slate, ainsi que par Collepardi, Corradi et Valente, et on constate une concordance satisfaisante. Le coefficient de variation des écarts par rapport aux données d'essai n'est pas plus important que pour l'échelle de résistance normale. Cependant, les données actuelles sont assez limitées, il serait donc souhaitable de continuer les essais.
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References
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Bažant, Z.P., Panula, L. Practical prediction of creep and shrinkage of high strength concrete. Mat. Constr. 17, 375–378 (1984). https://doi.org/10.1007/BF02478710
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DOI: https://doi.org/10.1007/BF02478710