Drying Kinetics in Building Materials and Components by João M. P. Q. Delgado & António C. Azevedo & Ana S. Guimarães

Author:João M. P. Q. Delgado & António C. Azevedo & Ana S. Guimarães
Language: eng
Format: epub
ISBN: 9783030318604
Publisher: Springer International Publishing

Moisture Diffusivity

Figure 2.16 shows the moisture content versus Boltzmann variable, η, for cement and lime mortar. For the materials tested, the Boltzmann transformation seems to hold very well. Based on this kind of η profiles the moisture diffusivity can be determined.

Fig. 2.16Example of moisture profiles plotted as a function of

The moisture diffusivity values presented in Fig. 2.17 were obtained by the Boltzmann transformation method over the whole moisture content. It is possible to observe that the shape of the curve representing the dependence of diffusion coefficients with moisture content was similar in all materials tested, and in accordance with literature results of Perrin [20], Daian [45] and Fernandes and Philippi [46].

Fig. 2.17Moisture diffusivity coefficient as a function of the moisture content

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