Experimental Tests of Water Vapour Permeability of Plasters

Abstract:

In the paper there are summarized results of diffusion properties of mortars. Water vapour permeability represented by diffusion thicknesses and water vapour resistance factors are except mechanical properties the most important physical parameters of historic buildings. These parameters are influenced by border conditions among that mainly temperature, relative humidity and barometric air pressure belong. It is necessary to know these parameters to understand a material behaviour after a flood. They are decisive for a determination how quick a diffusion speed rate will be and a drying process will take. Everything depends on a type of binder, a material of a structure itself and primarily on properties of mortar and plaster and finishing. After a flood it is necessary to know when users of buildings can start to make rehabilitations and which of them are proper for particular material and when can return to their homes.

• Periodical: Materials Science Forum (Volume 865)
• Pages: 151-156
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.865.151
• Online since: August 2016
• Authors: Šárka Nenadálová*, Lukáš Balík, Milan Rydval, Tomáš Bittner
• Keywords: Barometric Air Pressure, Border Conditions, Diffusion, Mortar, Relative Humidity, Temperature, Water Vapour Permeability, Water Vapour Resistance Factor

References

[1] ČSN EN ISO 7783-1: Paints and varnishes - Determination of water-vapour transmission rate – Part 1: Dish method for free films.

DOI: 10.3403/02047517u

[2] ČSN EN ISO 7783-2: Paints and varnishes – Coating materials and coating systems for exterior masonry and concrete – Part 2: Determination and classification of water-vapor transmission rate.

DOI: 10.3403/01605051

[3] L. Balik, J. Kolisko, The Influence of Incoming Parameters on Accuracy of Determination Water Vapour Resistance Factor of Lime and Modified Mortars, Klokner Institute CTU in Prague, (2009).

[4] WTA – směrnice 2-7-01/D. Vápenné omítky v památkové péči. 1. vydání. Vědeckotechnická společnost pro sanace staveb a péči o památky – WTA CZ, 2007. 20 s. ISBN 978-80-02-01986-2. In Czech.

[5] WTA – směrnice 2-9-04/D. Sanační omítkové systémy. 1. vydání. Vědeckotechnická společnost pro sanace staveb a péči o památky – WTA CZ, 2008. 20 s. ISBN 978-80-02-02103-2. In Czech.

[6] Š. Nenadálová, L. Balík, M. Rydval, T. Bittner, Diffusion Parameters of Basic Diffusion Adhesive Mortars with Silicate or Acrylic Plaster, ICEBMP (2015).

DOI: 10.4028/www.scientific.net/amr.1124.16