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<p>As energy conservation has become a major issue, the building sector is moving toward low-energy consumption and the development of bio-based thermal insulation materials contributes strongly to this approach. This research aims to create a eutectic mixture of animal and plant fatty acids, excluding petroleum sources, consisting of 70% myristic acid and 30% stearic acid. This phase change material (PCM) was then impregnated into date palm fiber waste using a vacuum technique. The melting points of both the eutectic mixture and the impregnated date palm fiber were measured at 35 and 34.5&#xa0;°C, respectively. A set of laboratory tests was conducted to study the impact of adding lime and cement at varying ratios comprised from 2 to 14% on the mechanical properties of the Brick. The evaluation focused on both compressive strength and flexural strength. The results revealed that incorporating lime into the earth blocks led to a notable improvement in compressive strength, with an increase of up to 66%. The highest strength was achieved at a 10% lime content. Clay bricks (widely used in Algerian construction) were prepared with 75% dune sand and 10% lime, and date palm fibers impregnated with PCM were added in varying proportions (0.5, 1, 1.5, and 2%) to test the mechanical and thermal properties of the bricks. The results showed an improvement in thermal insulation, with a reduction in thermal conductivity by 11% for bricks containing 2% impregnated palm fibers. The compressive strength of these bricks remained within acceptable limits, whether the PCM was in a solid or liquid state. This makes the modified bricks a robust and cost-effective alternative to traditional cement-based bricks.</p>

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Thermomechanical performance of new bio-based insulation material produced using fatty acids and date palm fibers

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Mahi Eddine Brahimi,
  • Mustapha Maliki,
  • Nadia Laredj,
  • Hanifi Missoum,
  • Miloud Sardou

摘要

As energy conservation has become a major issue, the building sector is moving toward low-energy consumption and the development of bio-based thermal insulation materials contributes strongly to this approach. This research aims to create a eutectic mixture of animal and plant fatty acids, excluding petroleum sources, consisting of 70% myristic acid and 30% stearic acid. This phase change material (PCM) was then impregnated into date palm fiber waste using a vacuum technique. The melting points of both the eutectic mixture and the impregnated date palm fiber were measured at 35 and 34.5 °C, respectively. A set of laboratory tests was conducted to study the impact of adding lime and cement at varying ratios comprised from 2 to 14% on the mechanical properties of the Brick. The evaluation focused on both compressive strength and flexural strength. The results revealed that incorporating lime into the earth blocks led to a notable improvement in compressive strength, with an increase of up to 66%. The highest strength was achieved at a 10% lime content. Clay bricks (widely used in Algerian construction) were prepared with 75% dune sand and 10% lime, and date palm fibers impregnated with PCM were added in varying proportions (0.5, 1, 1.5, and 2%) to test the mechanical and thermal properties of the bricks. The results showed an improvement in thermal insulation, with a reduction in thermal conductivity by 11% for bricks containing 2% impregnated palm fibers. The compressive strength of these bricks remained within acceptable limits, whether the PCM was in a solid or liquid state. This makes the modified bricks a robust and cost-effective alternative to traditional cement-based bricks.