Production of geopolymer mortar from fly ash, cannabis ash, and hemp fiber

Authors

  • Meesakthana Puapitthayathorn Faculty of Engineering, Mahasarakham University
  • Sahalaph Homwuttiwong Faculty of Engineering, Mahasarakham University

DOI:

https://doi.org/10.14456/jmu.2026.4

Keywords:

geopolymer mortar, cannabis ash, hemp fiber, compressive strength, flexural strength

Abstract

            This study aimed to improve the compressive and flexural strength of geopolymer mortar using cannabis ash and hemp fibers. The fly ash was replaced with cannabis ash in a range of 0-30% and the hemp fiber was incorporated in a range of 0-2% by weight. The ratio of alkaline solution to the source materials (AL/B) was 1.0 and the ratio of sodium silicate to sodium hydroxide solution (NS/NH) was 0.50. The ratio of water reducer to binder (S/B) was 1.0%. The mixture was cured at room temperature for 7, 14, and 28 days. The results showed that the maximum compressive strength of the geopolymer mortar at 28 days of 100F0C0H, 90F10C0H, and 70F30C0H were 270, 258, and 240 kg/cm2, respectively. The 70F30C0H mixture showed a maximum flexural strength of 42 kg/cm2 at 28 days. This study shows that the compressive and flexural strength of the geopolymer mortar was lower when the proportion of cannabis ash in the mixture was increased. However, the addition of hemp fibers in the geopolymer mortar mixture resulted in an increase in flexural strength compared to the control mortar.

References

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Published

2026-04-24

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Section

Research Articles