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<p>This study aims to develop sustainable cementitious composites incorporating recycled materials to evaluate their influence on thermal conductivity and assess their potential application in mitigating cold climatic conditions using environmentally friendly materials. Furthermore, the physical and mechanical properties of the proposed composites were systematically evaluated. Mortar mixtures were initially produced by partially replacing ordinary Portland cement with hydrated lime at replacement levels of 0%, 25%, 50%, and 75%. Based on the preliminary performance assessment and sustainability considerations, the mixture incorporating 50% hydrated lime was selected for the subsequent stages of the investigation. In the next phase, natural fine aggregate was partially substituted with construction waste–derived by-products, namely polymeric foam, sawdust, and red brick powder, at replacement ratios of 25%, 50%, and 75%, in order to examine their influence on the overall performance of the developed composites. To evaluate the internal structure and material compatibility, microstructural characterization was conducted on selected samples using appropriate analytical techniques to assess matrix homogeneity, interfacial bonding, and pore distribution. The experimental results revealed that increasing the hydrated lime content significantly enhanced the thermal insulation performance of the composites, achieving an improvement of up to 55%, although this enhancement was accompanied by a reduction in compressive strength. The incorporation of polymeric foam and sawdust further improved the thermal insulation capacity; however, these materials led to a noticeable decline in mechanical strength and an increase in water absorption, highlighting the necessity for appropriate moisture protection strategies. In contrast, the inclusion of red brick powder contributed to improved mechanical performance, with compressive strength reaching 10.06&#xa0;MPa and flexural strength 2.67&#xa0;MPa, while exerting only a marginal influence on thermal conductivity. This behavior indicates its suitability for structurally sustainable construction applications. Overall, the findings suggest that replacing 50% of cement with hydrated lime in combination with red brick powder provides an optimal balance between thermal efficiency, mechanical performance, and long-term durability, thereby supporting the development of environmentally friendly and sustainable construction materials.</p>

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Mechanical and thermal properties of sustainable lime Portland cement mortars incorporating recycled waste materials

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Walid H. Shalaby,
  • Abd Elmoaty M. Abd Elmoaty,
  • Abdelrhman B. Harraz,
  • Abdel-latif E. Abosen

摘要

This study aims to develop sustainable cementitious composites incorporating recycled materials to evaluate their influence on thermal conductivity and assess their potential application in mitigating cold climatic conditions using environmentally friendly materials. Furthermore, the physical and mechanical properties of the proposed composites were systematically evaluated. Mortar mixtures were initially produced by partially replacing ordinary Portland cement with hydrated lime at replacement levels of 0%, 25%, 50%, and 75%. Based on the preliminary performance assessment and sustainability considerations, the mixture incorporating 50% hydrated lime was selected for the subsequent stages of the investigation. In the next phase, natural fine aggregate was partially substituted with construction waste–derived by-products, namely polymeric foam, sawdust, and red brick powder, at replacement ratios of 25%, 50%, and 75%, in order to examine their influence on the overall performance of the developed composites. To evaluate the internal structure and material compatibility, microstructural characterization was conducted on selected samples using appropriate analytical techniques to assess matrix homogeneity, interfacial bonding, and pore distribution. The experimental results revealed that increasing the hydrated lime content significantly enhanced the thermal insulation performance of the composites, achieving an improvement of up to 55%, although this enhancement was accompanied by a reduction in compressive strength. The incorporation of polymeric foam and sawdust further improved the thermal insulation capacity; however, these materials led to a noticeable decline in mechanical strength and an increase in water absorption, highlighting the necessity for appropriate moisture protection strategies. In contrast, the inclusion of red brick powder contributed to improved mechanical performance, with compressive strength reaching 10.06 MPa and flexural strength 2.67 MPa, while exerting only a marginal influence on thermal conductivity. This behavior indicates its suitability for structurally sustainable construction applications. Overall, the findings suggest that replacing 50% of cement with hydrated lime in combination with red brick powder provides an optimal balance between thermal efficiency, mechanical performance, and long-term durability, thereby supporting the development of environmentally friendly and sustainable construction materials.