A hygroscopic method to measure the adsorption isotherm of porous construction materials

A. Taher, A.J.J. Zanden, van der, H.J.H. Brouwers

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Abstract

A sorption isotherm is the relationship between the moisture content in a material and the relative humidity of the surrounding atmosphere in an equilibrium situation. Most often, the sorption isotherm is measured with a gravitational method. This work presents a method to measure the adsorption isotherm of a porous construction material (sand-lime) with a hygroscopic method. The set-up of the experiment consists of a glass vessel that contains a humidity and temperature sensor. The measurement starts with drying a sample completely inside the vessel by blowing dry air through the vessel. After injecting a known amount of water into the vessel, the water evaporates and is adsorbed partly by the sample until an equilibrium state is reached. With the known amount of the injected water, the measured humidity inside the vessel and the volume of the vessel, one point of the adsorption isotherm is determined. For measuring the next point, more water is injected into the vessel. The desorption isotherm can also be measured with this technique.
Original languageEnglish
Title of host publication1st International Conference on the Chemistry of Construction Materials, 7-8 October 2013, Berlin
EditorsD. Stephan, H. Daake, von, V. Markl, G. Land
Place of PublicationBerlin
PublisherGDCh Division of Chemistry of Construction Chemicals
Pages241-244
ISBN (Print)978-3-936028-75-1
Publication statusPublished - 2013

Publication series

NameGDCh-Monographie
Volume46

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