Analytical model for the moisture absorption in capillary active building materials

Janetti, Michele Bianchi; Wagner, Péter

doi:10.1016/j.buildenv.2017.09.018

Cited by 9 publications

(11 citation statements)

References 15 publications

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“…This agrees with the data reported in [6,16], where the authors also relate the effectiveness of protection against moisture to using insoluble flame retardants. In contrast to the results from studies [8,17], the data obtained on the impact of moisture diffusion process by a flame-retardant coating and changes in moisture-insulating properties allow us to argue about the following:…”

Section: Discussion Of Results From Studying the Process Of The Progrmentioning

confidence: 63%

“…A mathematical model was considered for a change in the temperature and humidity fields of a fire-retardant coating based on the laws of conservation of matter and energy. The models immediately imply a specific type of functional dependences with a set of undefined coefficients, and the task is reduced to determining the numerical value for these coefficients, which is associated with high inaccuracy [8].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Modeling the process of moisture diffusion by a flame-retardant coating for wood

Tsapko

Bondarenko

2020

EEJET

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Section: Discussion Of Results From Studying the Process Of The Progrmentioning

confidence: 63%

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Modeling the process of moisture diffusion by a flame-retardant coating for wood

Tsapko

Bondarenko

2020

EEJET

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“…After determining the values of a, b and c, the w-λ profile becomes known ( [21][22][23]. Unlike the X-ray and ruler methods, the moisture diffusivity is not expressed as a continuous function but as a piecewise constant function with n different levels:…”

Section: Ruler Methodsmentioning

confidence: 99%

“…During the data processing, diffusivity values are estimated for the largest initial S value first by the following equation (rewritten from the original form in ref. [22,23]):…”

Section: Ruler Methodsmentioning

confidence: 99%

“…For instance, Evangelide et al [19,20] suggested a ruler method, wherein the position of the water front during the standard capillary absorption test was measured visually, allowing estimation of the moisture diffusivity without X-ray or other complicated facilities. Another method was proposed by Janz [21] and Janetti [22,23]. By conditioning the samples to different initial moisture contents and performing standard capillary absorption tests on the samples, the moisture diffusivity can be obtained as a piecewise constant function.…”

Section: Introductionmentioning

confidence: 99%

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Hygric properties of porous building materials (V): Comparison of different methods to determine moisture diffusivity

Ren

Feng

Janssen

2019

Building and Environment

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Moisture diffusivity is an important material property for performing the hygrothermal analysis of buildings and the built environment. Its experimental determination is still a challenge, albeit various destructive and non-destructive experimental methods are available. This paper compares the X-ray method, the ruler method, the multi-step method and the Kießl-Künzel method to non-destructively determine the moisture diffusivity of calcium silicate, ceramic brick and lime mortar. Results show that the ruler method can provide the closest results to the well-known X-ray attenuation method with a more straightforward process, but it's mainly suitable for materials with a sharp and visible water front. The multi-step method is easy to operate in experiments and suits most porous building materials, but it takes a long time to condition samples and needs complicated data processing, which seems too complex to get the moisture diffusivity as a step function. The Kießl-Künzel method is the simplest but not always accurate.

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Moisture Absorption in Capillary Active Materials: Analytical Solution for a Multiple Step Diffusivity Function

Janetti

2018

Transp Porous Med

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The absorption of moisture in a homogeneous, capillary active material obeys a diffusion law in which the driving potential is the volumetric water content, and the material behavior is characterized by the diffusivity function. In this study, an analytical solution for the one-dimensional case is proposed. The transient moisture profile is found by assuming the diffusivity as a multiple step function of the local water content and by solving the corresponding free boundary problem. Finally, a method for inverse determination of the diffusivity function is proposed. The case of a diffusivity function with three steps is investigated and discussed as an example.

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Analytical model for the moisture absorption in capillary active building materials

Cited by 9 publications

References 15 publications

Modeling the process of moisture diffusion by a flame-retardant coating for wood

Modeling the process of moisture diffusion by a flame-retardant coating for wood

Hygric properties of porous building materials (V): Comparison of different methods to determine moisture diffusivity

Moisture Absorption in Capillary Active Materials: Analytical Solution for a Multiple Step Diffusivity Function

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