✦ LIBER ✦

A through solution model for volume changes of cement hydration

✍ Scribed by P. Paulini

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 455 KB
Volume: 24
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(94)90137-6

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✦ Synopsis

Changes of volume, temperature and bonding forces accompany every chemical reaction. Cement hydration leads to volume shrinkage during CSH formation and is influenced by a twofold phase transition. Dissociation of cement into pore solution leads to volume swelling while the following crystallisation process produces volume shrinking. In the Through Solution (TS) -model presented here, the volume changes of cement reaction are described on the base of a consecutive reaction A -X -Z. The initial product A is considered as bulk volume of cement. X as a transition state product becomes the most important factor for the total reaction rate. The final product Z, as the volume of water bonded CS-phases, is regarded as the degree of hydration. The model has been shown to give adequate results for common cement reaction types.

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