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This research examines the sulphate durability of geopolymer mortar formulated from agro-based precursors Cassava Peel Ash (CPA), Rice Husk Ash (RHA), and metakaolin (MK) as an alternative to Portland cement. The ternary blend aims to develop a binder with lower carbon emissions and superior resistance to aggressive environments. Specimens were subjected to 5% sodium sulphate immersion for up to 90 days, and performance was assessed via compressive strength retention, mass loss, and surface deterioration. The mix labeled C50M33R17 (50% CPA, 33% MK, 17% RHA) achieved the highest sulphate resistance, maintaining 89.54% strength and showing only 17.3% weight loss. ANOVA and Tukey’s tests revealed statistically significant variations (p < 0.01), and a strong inverse correlation (r = –0.87) between mass loss and strength retention. This approach offers a promising, low-cost, and scalable alternative to OPC, with reduced CO₂ emissions and efficient use of agricultural waste. Long-term performance considerations and economic feasibility of scale-up are discussed.

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Sulphate Resistance of Sustainable Geopolymer Mortar Synthesized from Cassava Peel Ash, Rice Husk Ash, and Metakaolin

  • 会议论文

  • 发表日期：

    2026年

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  • Ali Hussain Alhamami

摘要

This research examines the sulphate durability of geopolymer mortar formulated from agro-based precursors Cassava Peel Ash (CPA), Rice Husk Ash (RHA), and metakaolin (MK) as an alternative to Portland cement. The ternary blend aims to develop a binder with lower carbon emissions and superior resistance to aggressive environments. Specimens were subjected to 5% sodium sulphate immersion for up to 90 days, and performance was assessed via compressive strength retention, mass loss, and surface deterioration. The mix labeled C50M33R17 (50% CPA, 33% MK, 17% RHA) achieved the highest sulphate resistance, maintaining 89.54% strength and showing only 17.3% weight loss. ANOVA and Tukey’s tests revealed statistically significant variations (p < 0.01), and a strong inverse correlation (r = –0.87) between mass loss and strength retention. This approach offers a promising, low-cost, and scalable alternative to OPC, with reduced CO₂ emissions and efficient use of agricultural waste. Long-term performance considerations and economic feasibility of scale-up are discussed.