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This study deals with the effects of expanded perlite and two type of clays (bentonite and kaolin) on the moisture transport properties of lightweight cement-clay plasters. The specific properties examined in this study are open porosity, open porosity, bulk density, saturation moisture content, capillary absorption coefficient and surface temperature during drying test. In these plaster mixers cement is replaced by a 50% (vol.) kaolin and bentonite content, as well sand is replaced by a 100% (vol.) expanded perlite content. The results indicate that the incorporation of both clay and perlite allows for the production of plasters with a bulk weight and porosity reduction of 100% and 400% respectively. This high void content contributes to high absorption, increasing the material’s water saturation content up to 4 times. The material porosity has influence on surface temperature that rapidly dropped due to evaporation, due to evaporative cooling effect at the first phase of drying, as well as second phase duration.

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Investigation of the Role of Clay Types and Porous Aggregate Effects on the Hygric Properties of Earth-Based Plasters

  • 会议论文

  • 发表日期：

    2025年

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  • Liliia Kushnierova,
  • Bahman Ghiassi,
  • Myat Khine

摘要

This study deals with the effects of expanded perlite and two type of clays (bentonite and kaolin) on the moisture transport properties of lightweight cement-clay plasters. The specific properties examined in this study are open porosity, open porosity, bulk density, saturation moisture content, capillary absorption coefficient and surface temperature during drying test. In these plaster mixers cement is replaced by a 50% (vol.) kaolin and bentonite content, as well sand is replaced by a 100% (vol.) expanded perlite content. The results indicate that the incorporation of both clay and perlite allows for the production of plasters with a bulk weight and porosity reduction of 100% and 400% respectively. This high void content contributes to high absorption, increasing the material’s water saturation content up to 4 times. The material porosity has influence on surface temperature that rapidly dropped due to evaporation, due to evaporative cooling effect at the first phase of drying, as well as second phase duration.