Evidence for anomalous water vapor sorption kinetics in cement based materials |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA;3. DGAC, STAC, F-94385 Bonneuil-sur-Marne, France;1. Laboratory of Construction Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland;2. Concrete/Construction Chemistry Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf CH-8600, Switzerland;3. Institute for Building Materials, ETH Zurich, Zurich CH-8092, Switzerland |
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| Abstract: | We used dynamic sorption balance measurements to evaluate the diffusivity for cement pastes with three different binders (OPC, OPC + 70% slag, OPC + 10% silica fume). The diffusion of water vapor in cement based materials is normally assumed to follow Fick's law of diffusion, but our results clearly show that Fick's law cannot completely describe the sorption process in our materials. In this paper we report the evidence for this anomalous sorption behavior and discuss a possible method to evaluate diffusivities from such measurements. |
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