Concentration Dependent Diffusion in Building Materials – Application of Different Methods

N.M.M. Ramos; João M.P.Q. Delgado; V.P. de Freitas

doi:10.4028/www.scientific.net/DDF.273-276.150

Paper Titles

Dynamic and Equilibrium Swelling of Biodegradable Starch-Based Superabsorbent Polymers
p.126

Experimental Values of Diffusion Coefficients of Organic Compounds in Water
p.132

Effect of Temperature and Volume Changes on Effective Diffusivities of Sucrose and NaCl during Osmotic Dehydration of Vegetable Tissue
p.138

Numerical Study of Propane-Air Mixture Combustion in a Burner Element
p.144

Concentration Dependent Diffusion in Building Materials – Application of Different Methods
p.150

Anomalous Diffusion during Water Absorption in Porous Building Materials – Experimental Evidence
p.156

Influence of Burner Geometry on Flame Characteristics of Propane-Air Mixture: Experimental and Numerical Studies
p.162

Systematics of Grain Boundary Diffusion and Solute Segregation in Copper Poly- and Bicrystals
p.168

Metal Oxides Interaction with Reducing Gas in Bubble Ore Melt
p.176

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Concentration Dependent Diffusion in Building Materials – Application of Different Methods

Abstract:

Moisture is an important factor when analyzing the behaviour of building elements and materials. A deeper knowledge on moisture transport under transient conditions of environmental air temperature and humidity is required. In this experimental work, the measurements of moisture diffusion coefficients, w D , of three different types of building materials commonly used in Portugal (gypsum plasterboard, gypsum plaster and gypsum+lime plaster) were obtained for different values of temperature and relative humidity. The results obtained were in good agreement with the values found in literature and show that the increase in temperature resulted in an increase in the diffusion coefficient and an increase in relative humidity (54% to 69%) resulted in a decrease in w D .