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Investigations On The Water Vapor Permeability Of Cementitious Materials Ivan Odler And Hans-Peter Barthold

Published online by Cambridge University Press:  22 February 2011

Ivan Odler  and
Hans-Peter Barthold
Ivan Odler
Affiliation:
Institute of Nonmetallic Materials, Technical University Clausthal, D-3392 Clausthal-Zellerfeld, Fed. Rep. Germany
Hans-Peter Barthold
Affiliation:
Institute of Nonmetallic Materials, Technical University Clausthal, D-3392 Clausthal-Zellerfeld, Fed. Rep. Germany
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Abstract

The migration of water vapor through the existing pore system was studied on a series of cementitious, hydrothermally produced and ceramic materials with open porosities ranging between 18 and 79 per cent. Regardless on the nature of the material the water vapor migration rate increased linearly with open porosity. As to the effect of pore size, the apparent diffusion coefficient was moderately greater in pores with radii above 100μm than in smaller pores. As to the effect of relative humidity the water migration rate was greatest at high humidities and exhibited a moderate minimum at about 20–40% r.h.. At equlibrium conditions the amount of water bound in the pore system of samples through which water vapor was alloved to migrate was consistently lower than in identical samples in which just water vapor adsorption took place.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 137: Symposium P – Pore Structure and Permeability of Cementitious Materials , 1988 , 215
Copyright
Copyright © Materials Research Society 1989

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