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<p>Lightweight geopolymer composites offer potential for sustainable insulation materials; however, the combined use of granulated blast furnace slag (BFS), raw perlite powder (RPP), expanded perlite aggregate (EPA), polypropylene fiber (PF), and magnetized water (MW) under ambient curing conditions has not been sufficiently investigated. This study develops ambient-cured lightweight geopolymer composites and evaluates their mechanical, thermal, and microstructural performance. The experimental program included NaOH molarity optimization, comparison of tap water (TW) and MW, substitution of RPP for BFS at 10–50% by volume, and incorporation of PF. The results showed that 6M NaOH provided the most favorable balance between workability and mechanical performance, with a 28-day compressive strength of approximately 10.5&#xa0;MPa in EPA-containing mixtures. The use of MW resulted in a slight increase in compressive strength, approximately 3–4%, and SEM observations indicated a relatively denser gel morphology; however, this effect was interpreted cautiously due to the limited magnitude of improvement and the absence of direct physicochemical characterization of MW. Increasing RPP content reduced strength due to its lower reactivity compared with BFS, whereas PF improved flexural performance. The lowest thermal conductivity value was 0.1345 W/m·K, obtained in PF-reinforced mixtures containing EPA and MW, with a unit weight of approximately 880&#xa0;kg/m<sup>3</sup>. The findings indicate that these composites are promising for non-load-bearing wall elements and insulation panels rather than structural applications.</p>

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Mechanical and thermal performance of lightweight geopolymer composites incorporating expanded perlite and magnetized water

  • 期刊论文

  • 发表日期：

    2026年8月4日

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  • Serdar Korkmaz,
  • İlhami Demir,
  • Gazi Günel,
  • Ozer Sevim

摘要

Lightweight geopolymer composites offer potential for sustainable insulation materials; however, the combined use of granulated blast furnace slag (BFS), raw perlite powder (RPP), expanded perlite aggregate (EPA), polypropylene fiber (PF), and magnetized water (MW) under ambient curing conditions has not been sufficiently investigated. This study develops ambient-cured lightweight geopolymer composites and evaluates their mechanical, thermal, and microstructural performance. The experimental program included NaOH molarity optimization, comparison of tap water (TW) and MW, substitution of RPP for BFS at 10–50% by volume, and incorporation of PF. The results showed that 6M NaOH provided the most favorable balance between workability and mechanical performance, with a 28-day compressive strength of approximately 10.5 MPa in EPA-containing mixtures. The use of MW resulted in a slight increase in compressive strength, approximately 3–4%, and SEM observations indicated a relatively denser gel morphology; however, this effect was interpreted cautiously due to the limited magnitude of improvement and the absence of direct physicochemical characterization of MW. Increasing RPP content reduced strength due to its lower reactivity compared with BFS, whereas PF improved flexural performance. The lowest thermal conductivity value was 0.1345 W/m·K, obtained in PF-reinforced mixtures containing EPA and MW, with a unit weight of approximately 880 kg/m3. The findings indicate that these composites are promising for non-load-bearing wall elements and insulation panels rather than structural applications.