Hygric properties of porous building materials (VII): Full-range benchmark characterizations of three materials

Feng, Chi; Janssen, Hans

doi:10.1016/j.buildenv.2021.107727

Cited by 25 publications

(21 citation statements)

References 37 publications

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“…The moisture retention curve of the Robusta brick has previously been determined by other experimental techniques (e.g. pressure plates) by Feng and Janssen (2021). In this paper, the MIP results showed to be representative of the moisture retention curve of this material over the capillary pressure range studied in this paper.…”

Section: Methodssupporting

confidence: 61%

“…In this section, the steady state centrifuge experiment is validated using Robusta bricks produced by Vandersanden (Belgium), a material that has been extensively investigated by Feng and Janssen (2021). In this paper, the moisture retention curve of the brick is derived from new mercury intrusion porosimetry (MIP) measurements on three samples.…”

Section: Methodsmentioning

confidence: 99%

“…This allows measuring the entire moisture retention curve of most (if not all) commercial ceramic bricks as well as many other building materials. Compared to the pressure plates, which allow maximum capillary pressures of 1.5310 6 Pa (Feng and Janssen, 2021), this technique guarantees a similar or more extensive measuring range. For materials which require even higher capillary pressures (or lower relative humidities), other techniques are well-established (e.g.…”

Section: Designing the Motormentioning

confidence: 99%

“…This paper focuses on the determination of moisture storage properties, since the existing experimental techniques can be time-consuming, inaccurate and often only applicable to a part of the desired measuring range (Feng et al, 2020). The pressure plate test, for example, is only applicable in the capillary region and requires about 2 months (Feng and Janssen, 2021). While mercury intrusion porosimetry (MIP) provides the full-range moisture retention curve in a matter of days, the use of environmentally damaging mercury as well as its inability to start from the (more realistic) capillary water content, constitute its challenges.…”

Section: Introductionmentioning

confidence: 99%

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Development and validation of the steady state centrifuge experiment for the moisture retention curve of porous building materials

Deckers

Janssen

2023

Journal of Building Physics

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With the development of more efficient hygrothermal computer models, simulation studies have become increasingly important in the design of building components. To obtain trustworthy results from these studies, accurate hygric properties are required. The existing methods for moisture storage properties, however, are not very well suited to accurately measure moisture retention curves within a compact timeframe. To improve on this front, this paper introduces the steady state centrifuge technique, a common experiment in soil physics, for use on porous building materials. The laboratory centrifuge, used for the validation of this technique, is self-made to limit its cost and account for specific design choices. In the first part of the paper, the design of the laboratory centrifuge is described and all problems encountered during the development are explained and resolved. The two main problems are excessive heat generation by the motor and unwanted evaporation from the sample’s surfaces. The excessive heat generation is solved by extraction of heat both at the source, by using a ventilator, and at the rotor, by adding carefully positioned air extraction holes. The unwanted evaporation is eliminated by incorporating sample holders to shield the sample from the surrounding air. In the second part of the paper, the steady state centrifuge experiment is used to measure the desorption moisture retention curves of a ceramic brick starting from both saturated and capillary moisture content. The results are validated by their similarity to the curves obtained by mercury intrusion porosimetry. Besides providing accurate results, the determination of the full moisture retention curve requires only 1–2 weeks, which is significantly quicker than other common protocols, such as the pressure plates, which take about 2 months. Additionally, the ability to measure the desorption moisture retention curve from capillary moisture content as well as the limited cost of the centrifuge design (€6000) provide major advantages.

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Section: Methodssupporting

confidence: 61%

Section: Methodsmentioning

confidence: 99%

Section: Designing the Motormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and validation of the steady state centrifuge experiment for the moisture retention curve of porous building materials

Deckers

Janssen

2023

Journal of Building Physics

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“…Sixthly, [1]'s authors are invited to support the moisture storage and transport properties obtained with [1]'s inverse characterisation, as the discusser distils a pore structure that is highly implausible for refractory bricks. Such support could for example be found in mercury intrusion porosimetry, which has recently been confirmed as a reliable approach for determining moisture retention curves [25]. Seventhly, [1]'s authors are invited to corroborate the identifiability of the permeability from capillary absorption experiments, as the discusser shows that gravity only has a negligible contribution in such moisture transfer process.…”

Section: Discussionmentioning

confidence: 90%

A critique on “An efficient numerical model for liquid water uptake in porous material and its parameter estimation”

Janssen

2022

Numerical Heat Transfer, Part A: Applications

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In February 2019 this journal published the article "An efficient numerical model for liquid water uptake in porous material and its parameter estimation", (re)introducing the Scharfetter-Gummel numerical model for simulation of moisture transfer in building materials, and applying it for the inverse characterisation of hygric properties based on a capillary absorption experiment. This critique voices concerns on the moisture transfer model defined and on the moisture transfer simulations performed. It moreover formulates doubts on the obtained identification and intended identifiability of the moisture transfer properties. This critique invites the article's authors to address these concerns, to confirm their outcomes' reliability.

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Toward Stochastic Full-Scale Pore Network Generation for Porous Building Materials

Shi,

Soete,

Janssen

2024

Lecture Notes in Civil Engineering

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Hygric properties of porous building materials (VII): Full-range benchmark characterizations of three materials

Cited by 25 publications

References 37 publications

Development and validation of the steady state centrifuge experiment for the moisture retention curve of porous building materials

Development and validation of the steady state centrifuge experiment for the moisture retention curve of porous building materials

A critique on “An efficient numerical model for liquid water uptake in porous material and its parameter estimation”

Toward Stochastic Full-Scale Pore Network Generation for Porous Building Materials

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