International Research Journal of Innovations in Engineering and Technology - IRJIET International Open Access, Monthly, Peer Reviewed, Reputed Journal ISSN (online): 2581-3048

Impact Factor (2025): 6.9

DOI Prefix: 10.47001/IRJIET

Calculating the Effective Moisture Diffusivity during Drying Process of Gypsum Board

Abstract

Gypsum (CaSO4.2H2O) is a type of materials which can be used as a precursor to manufacture insulating building materials. The manufacture process of gypsum board usually is comprised of two steps: (1) preparing the samples by adding water to the gypsum, and (2) drying. Aging (or drying) in wet gypsum board is a complex transport process that involves evaporation due to the difference in liquid concentration between the surrounding air and the sample surface and drainage that is induced by gravity. A full understanding of the aging process may help the researches to choose efficient steps parameters (e.g. the required aging time). Also, it collects the input data for manufacturing numerical models. In the current study, the researcher provided data experimentally (end of aging time, moisture content, and effective moisture diffusivity) on aging of gypsum board under controlled conditions, (i.e. temperature and relative humidity).

Aging curves were tested for different samples with three different concentrations of the gypsum material on substrates with two values of contact angles (hydrophilic and super- hydrophobic). In addition, the effects of gypsum particles size were tested under all aging conditions. Transport of moisture is represented by estimating the moisture diffusivity utilizing slope method.

The study concluded that the moisture diffusivity reversed change with the average moisture content where, the moisture diffusivity increased during the aging as the decrease in the average moisture content for all trials. Gypsum concentrations had the  strongest effect on the drying time and effective moisture diffusivity where is, the gypsum particles size did  not affect strongly on them for both types of substrates (super-hydrophobic and hydrophilic). Such information may be useful in using the gypsum as material to fabricate insulating building materials.

Country : Iraq

1 Waleed M. Najm2 Omer S. Alabidalkreem3 Awadhalosh

  1. Northern Technical University, Technical Institute, Mosul, 42002, Iraq
  2. Department of Mechanical Engineering, College of Engineering, University of Mosul, 42002, Iraq
  3. Department of Mechanical Engineering, College of Engineering, University of Mosul, 42002, Iraq

IRJIET, Volume 6, Issue 7, July 2022 pp. 31-42

doi.org/10.47001/IRJIET/2022.607006

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