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<p>This study examines the effect of metakaolin (MK) content on the mechanical and durability performance of one-part fly ash (FA)-based geopolymer mortars cured under ambient conditions. Fly ash was partially replaced with MK at ratios of 0-50% by mass, and sodium metasilicate was used as the alkaline activator. All specimens were cured at 20 ± 1&#xa0;°C and 50 ± 10% relative humidity for 28&#xa0;days. The results showed that increasing MK content significantly improved both mechanical and durability performance. The 28-day compressive strength increased from 15.1&#xa0;MPa for the 0% MK mixture to 60.2&#xa0;MPa for the mixture containing 50% MK, while flexural strength increased from 4.8&#xa0;MPa to 9.8&#xa0;MPa. Water absorption and apparent porosity decreased with increasing MK content, and the initial sorptivity coefficient was reduced by approximately 18% at 50% MK replacement. After 300 freeze–thaw cycles, mixtures with higher MK content exhibited substantially lower weight and strength losses compared to the FA-only mixture. In addition, rapid chloride permeability decreased, and reductions in corrosion-induced mass and bond strength losses were observed. Overall, the findings demonstrate that incorporating metakaolin, particularly at higher replacement levels, effectively improves the mechanical performance and durability of one-part geopolymers cured at ambient conditions.</p>

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Durability Performance of One-Part Fly Ash-Metakaolin Geopolymers Cured at Ambient Conditions

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Zainab Hataf Naji,
  • İsmail İsa Atabey,
  • Zehra Almaz Özcan,
  • Hadiye Hakkomaz Şahin,
  • Serhan İlkentapar,
  • Uğur Durak,
  • Okan Karahan,
  • Cengiz Duran Atiş

摘要

This study examines the effect of metakaolin (MK) content on the mechanical and durability performance of one-part fly ash (FA)-based geopolymer mortars cured under ambient conditions. Fly ash was partially replaced with MK at ratios of 0-50% by mass, and sodium metasilicate was used as the alkaline activator. All specimens were cured at 20 ± 1 °C and 50 ± 10% relative humidity for 28 days. The results showed that increasing MK content significantly improved both mechanical and durability performance. The 28-day compressive strength increased from 15.1 MPa for the 0% MK mixture to 60.2 MPa for the mixture containing 50% MK, while flexural strength increased from 4.8 MPa to 9.8 MPa. Water absorption and apparent porosity decreased with increasing MK content, and the initial sorptivity coefficient was reduced by approximately 18% at 50% MK replacement. After 300 freeze–thaw cycles, mixtures with higher MK content exhibited substantially lower weight and strength losses compared to the FA-only mixture. In addition, rapid chloride permeability decreased, and reductions in corrosion-induced mass and bond strength losses were observed. Overall, the findings demonstrate that incorporating metakaolin, particularly at higher replacement levels, effectively improves the mechanical performance and durability of one-part geopolymers cured at ambient conditions.