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<p>The hygrothermal behavior of building materials, especially hygroscopic ones, has been widely studied, yet many existing models simplify complex phenomena such as sorption hysteresis and temperature-dependent moisture behavior. These limitations are particularly significant for Aerated Cellular Concrete (ACC), where coupled hygrothermal effects strongly influence performance. This study combines experimental and numerical approaches to address these gaps. ACC samples were characterized for their physical, thermal, and hygric properties, revealing pronounced sorption hysteresis, particularly at high relative humidity. Transient heat and moisture simulations under cyclic boundary conditions are conducted using a model accounting for hysteresis and temperature dependence. Model predictions are validated against experimental data obtained via the Nordtest protocol. Results demonstrate that incorporating hysteresis and temperature effects improves agreement between simulations and experiments, supporting the development of more accurate hygrothermal models for porous building materials.</p>

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Hygrothermal characterisation of aerated cellular concrete and influence of the sorption mechanisms on the transient hygrothermal response

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Maram Bouazizi,
  • Nizar Ben Ezzine,
  • Yacine Ait Oumeziane,
  • Philippe Desevaux,
  • Walid Oueslati

摘要

The hygrothermal behavior of building materials, especially hygroscopic ones, has been widely studied, yet many existing models simplify complex phenomena such as sorption hysteresis and temperature-dependent moisture behavior. These limitations are particularly significant for Aerated Cellular Concrete (ACC), where coupled hygrothermal effects strongly influence performance. This study combines experimental and numerical approaches to address these gaps. ACC samples were characterized for their physical, thermal, and hygric properties, revealing pronounced sorption hysteresis, particularly at high relative humidity. Transient heat and moisture simulations under cyclic boundary conditions are conducted using a model accounting for hysteresis and temperature dependence. Model predictions are validated against experimental data obtained via the Nordtest protocol. Results demonstrate that incorporating hysteresis and temperature effects improves agreement between simulations and experiments, supporting the development of more accurate hygrothermal models for porous building materials.