Journal
CEMENT AND CONCRETE RESEARCH
Volume 41, Issue 9, Pages 987-992Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2011.06.001
Keywords
Humidity; Hydration; Reaction
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It has been observed that the hydration of cement paste stops when the relative humidity drops below about 80%. A thermodynamic analysis shows that the capillary pressure exerted at that RH shifts the solubility of tricalcium silicate, so that it is in equilibrium with water. This is a reflection of the chemical shrinkage in this system: according to Le Chatelier's principle, since the volume of the products is less than that of the reactants, a negative (capillary) pressure opposes the reaction. (C) 2011 Elsevier Ltd. All rights reserved.
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