SIZE EFFECT ON THE ULTIMATE DRYING SHRINKAGE OF CEMENT MORTAR: 1-YEAR EXPERIMENT AND NUMERICAL MODELING

• Main Authors: Lenka Dohnalová, Petr Havlásek, Vít Šmilauer, Pavel Reiterman, Vendula Davidová
• Format: Article
• Language: English
• Published: CTU Central Library 2021-04-01
• Series: Acta Polytechnica CTU Proceedings
• Subjects: concrete; drying; modeling; shrinkage; size effect.
• Online Access: https://ojs.cvut.cz/ojs/index.php/APP/article/view/7192

The magnitude and time evolution of shrinkage are influenced by numerous factors which are implemented in the design codes often in a different way. The time-dependent behavior of concrete in structures sensitive to creep and shrinkage should be verified by means of short-term laboratory measurements. Extrapolation of drying shrinkage from short-term measurements is an illposed problem. The process is extremely slow but can be accelerated by reducing the specimen size. The knowledge of the size-effect on drying shrinkage is a necessity to establish the transition from the laboratory to the structural size. In the literature, the experimental data on such size-effect are insufficient. For this reason a new experiment was developed to study this phenomenon on small-scale specimens made of cement mortar and the results from the first year are summarized in this paper. The measured data are validated by coupled FEM hygro-mechanical simulations.