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Drying shrinkage mechanisms of hardened cement paste
Drying shrinkage has been experimentally investigated by means of a newly developed laser-supported measuring principle. Further-mainly novel-methods have been applied for examining sorption behaviour as well as inner volume and density change. Divided into de- and adsorption, different sections of relative humidity are found with each varying dominating mechanisms. In the lower humidity range shrinkage and swelling are proportional to change in surface free energy. However, an energy reduction during adsorption does not lead to an expansion as assumed up to now (Munich Model), but to a contraction of csh-particles, while pore volume increases simultaneously (and vice versa during desorption). For this reason the influence of surface energy has to be attributed to the dispersive component of disjoining pressure which prevails in the lower humidity range, whereas in the range of condensation repulsiv components and capillary tension dominate the processes in hcp.
Drying shrinkage mechanisms of hardened cement paste
Drying shrinkage has been experimentally investigated by means of a newly developed laser-supported measuring principle. Further-mainly novel-methods have been applied for examining sorption behaviour as well as inner volume and density change. Divided into de- and adsorption, different sections of relative humidity are found with each varying dominating mechanisms. In the lower humidity range shrinkage and swelling are proportional to change in surface free energy. However, an energy reduction during adsorption does not lead to an expansion as assumed up to now (Munich Model), but to a contraction of csh-particles, while pore volume increases simultaneously (and vice versa during desorption). For this reason the influence of surface energy has to be attributed to the dispersive component of disjoining pressure which prevails in the lower humidity range, whereas in the range of condensation repulsiv components and capillary tension dominate the processes in hcp.
Drying shrinkage mechanisms of hardened cement paste
Trockenschwindungsmechanismen einer gehärteten Zementpaste
Duckheim, C. (author) / Setzer, M.J. (author)
2009
7 Seiten, 14 Bilder, 1 Tabelle, 6 Quellen
Conference paper
English
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