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Infinitesimal Shrinkage as Determined by Inverse Analysis Based on Drying and Shrinkage Tests
The non-uniformity of the moisture distribution in drying concrete specimens results in differential shrinkage. If the specimen thickness tends to zero, theoretically, the so-called infinitesimal shrinkage would occur. Since the latter may not be determined directly by experimental means, a method for the inverse analysis of shrinkage tests has been developed. Laboratory-sized concrete specimens are subjected to drying, whereby the mass loss and the deformation are measured. Then, the material-specific relationship between the unhindered infinitesimal shrinkage strain and the relative humidity is retrieved from the experimental results by inverse analysis of the respective test. Drying is simulated by using the non-linear diffusion theory. In the mechanical model, elastic and viscoelastic strain - as well as cracking and strain softening - are taken into account in addition to the unhindered local shrinkage. Sensitivity analyses have shown that the measurement of the mass loss and the determination of the desorption isotherm should be conducted with high accuracy in order to obtain reliable inverse analysis results.
Infinitesimal Shrinkage as Determined by Inverse Analysis Based on Drying and Shrinkage Tests
The non-uniformity of the moisture distribution in drying concrete specimens results in differential shrinkage. If the specimen thickness tends to zero, theoretically, the so-called infinitesimal shrinkage would occur. Since the latter may not be determined directly by experimental means, a method for the inverse analysis of shrinkage tests has been developed. Laboratory-sized concrete specimens are subjected to drying, whereby the mass loss and the deformation are measured. Then, the material-specific relationship between the unhindered infinitesimal shrinkage strain and the relative humidity is retrieved from the experimental results by inverse analysis of the respective test. Drying is simulated by using the non-linear diffusion theory. In the mechanical model, elastic and viscoelastic strain - as well as cracking and strain softening - are taken into account in addition to the unhindered local shrinkage. Sensitivity analyses have shown that the measurement of the mass loss and the determination of the desorption isotherm should be conducted with high accuracy in order to obtain reliable inverse analysis results.
Infinitesimal Shrinkage as Determined by Inverse Analysis Based on Drying and Shrinkage Tests
Villmann, B. (author) / Slowik, V. (author) / Wang, P. (author) / Wittmann, F. H. (author)
Ninth International Conference on Creep, Shrinkage, and Durability Mechanics (CONCREEP-9) ; 2013 ; Cambridge, Massachusetts, United States
2013-09-23
Conference paper
Electronic Resource
English
Moisture , Mechanical properties , Creep , Concrete , Durability , Dewatering , Shrinkage
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