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Pore Structure Parameters and Drying Rates of Building Materials

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Drying and Wetting of Building Materials and Components

Part of the book series: Building Pathology and Rehabilitation ((BUILDING,volume 4))

Abstract

Experimentally obtained courses of drying for representative porous building materials were investigated. With use of analytical and numerical solutions of the diffusion equation the moisture transport parameters of the materials were identified from the experimental data and modelled in relation to the parameters of their pore structure. The capillary models of moisture diffusivity based on the pore size distribution of given material were used in this analysis. It was confirmed that the character of drying rates specific both for their constant and falling periods is dependent on combination of only a few important pore structure parameters specific for each material. In concordance with the capillary models the pore volumes equivalent to critical degrees of water saturation during drying as the critical moisture content, the capillary moisture content and the full saturation are in a correlation with the drying rates and can serve as indicators of the actual evaporation potential of given material.

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Abbreviations

Α :

Water absorption coefficient (kg/m2 s0.5)

β :

Surface water vapour diffusion coefficient (kg/m2 s Pa)

d :

Thickness (m)

D(w):

Material moisture diffusivity (m2/s)

D a :

Binary water vapour diffusion coefficient in air

G :

Relative evaporation (−)

h c :

Convective surface heat transfer coefficient (W/m2 K)

K(w):

Permeability (s)

p sat :

Saturation water vapour pressure (Pa)

p crit :

Material water vapour pressure at critical moisture content (Pa)

p :

Water vapour pressure (Pa)

p c :

Capillary pressure (Pa)

q :

Drying rate density (kg/m2 s)

r :

Pore radius (m)

R :

Gas constant (J/kg K)

S :

Degree of saturation (−)

SSA :

Specific surface area (m2/m3)

t :

Time (s), water film thickness (m)

T :

Temperature (K)

t d :

Duration of the first period drying (h)

w :

Volumetric moisture content (kg/m3, m3/m3)

w cap :

Capillary moisture content (kg/m3, m3/m3)

w crit :

Critical moisture content (kg/m3, m3/m3)

x :

Space coordinate (m)

φ :

Relative humidity (%)

ξ(ω):

Moisture capacity (kg/kg Pa)

μ :

Diffusion resistance factor (−)

ρ :

Density (kg/m3)

η :

Dynamic viscosity (Pa s)

σ lg :

Surface tension for water (N/m)

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Authors and Affiliations

  1. Institute of Construction and Architecture, Slovak Academy of Sciences, Dúbravská cesta 9, 845 03, Bratislava 45, Slovakia

    Peter Matiasovsky & Peter Mihalka

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  1. Peter Matiasovsky
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  2. Peter Mihalka
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Correspondence to Peter Matiasovsky .

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Editors and Affiliations

  1. LFC - Building Physics Laboratory, University of Porto, Porto, Portugal

    J.M.P.Q. Delgado

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Matiasovsky, P., Mihalka, P. (2014). Pore Structure Parameters and Drying Rates of Building Materials. In: Delgado, J. (eds) Drying and Wetting of Building Materials and Components. Building Pathology and Rehabilitation, vol 4. Springer, Cham. https://doi.org/10.1007/978-3-319-04531-3_4

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  • DOI: https://doi.org/10.1007/978-3-319-04531-3_4

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-04530-6

  • Online ISBN: 978-3-319-04531-3

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