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<p>Geopolymers are being researched as alternatives to ordinary Portland cement (OPC) due to their lower energy consumption and increased durability. Their properties are significantly influenced by synthesis parameters, including selected aluminosilicate raw materials, mixing proportions, and curing conditions. Additionally, the aggregates' properties significantly influence the geopolymer's characteristics due to their substantial volume in the mix. In this study, aggregates with different mineralogical compositions were selected to investigate their effects on the properties of geopolymer mortars. CEN sand was chosen as the reference, alongside sintered magnesite and crushed brick tile. Fly ash was used as the precursor and activated by sodium silicate. Mortars were produced with varying water contents to achieve two targeted flow diameters and cured at two different temperatures to examine the effects on mechanical and microstructural properties. For all the samples, the densities decreased as the amount of water and the curing temperature increased. Compressive strength increased with higher curing temperatures, indicating that geopolymerization reactions progressed rapidly and were successfully completed. The sand-containing samples exhibit the highest compressive strength of 34.4&#xa0;MPa. Compressive strength decreased when using sintered magnesite due to the formation of magnesium silicate hydrate or hydrotalcite-like phases. The lowest compressive strength of 22&#xa0;MPa was obtained using crushed brick tile due to insufficient compaction. Microstructural analysis was consistent with the results, showing that increased water content led to a more porous structure, whereas higher temperatures resulted in a gel structure.</p>

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Toward Environmentally Sustainable Construction: Investigating the Effects of Aggregate Type and Curing Temperature on the Mechanical and Microstructural Properties of Fly-Ash-Based Geopolymer Mortar

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Ahmet İnal,
  • Derya Över,
  • Evren Arıöz

摘要

Geopolymers are being researched as alternatives to ordinary Portland cement (OPC) due to their lower energy consumption and increased durability. Their properties are significantly influenced by synthesis parameters, including selected aluminosilicate raw materials, mixing proportions, and curing conditions. Additionally, the aggregates' properties significantly influence the geopolymer's characteristics due to their substantial volume in the mix. In this study, aggregates with different mineralogical compositions were selected to investigate their effects on the properties of geopolymer mortars. CEN sand was chosen as the reference, alongside sintered magnesite and crushed brick tile. Fly ash was used as the precursor and activated by sodium silicate. Mortars were produced with varying water contents to achieve two targeted flow diameters and cured at two different temperatures to examine the effects on mechanical and microstructural properties. For all the samples, the densities decreased as the amount of water and the curing temperature increased. Compressive strength increased with higher curing temperatures, indicating that geopolymerization reactions progressed rapidly and were successfully completed. The sand-containing samples exhibit the highest compressive strength of 34.4 MPa. Compressive strength decreased when using sintered magnesite due to the formation of magnesium silicate hydrate or hydrotalcite-like phases. The lowest compressive strength of 22 MPa was obtained using crushed brick tile due to insufficient compaction. Microstructural analysis was consistent with the results, showing that increased water content led to a more porous structure, whereas higher temperatures resulted in a gel structure.