Scholarlink

<p>The environmental burden of ordinary Portland cement production, contributing 8% of global CO<sub>2</sub> emissions, necessitates sustainable alternatives like alkali-activated binders. This study introduces a pioneering approach by developing a fully waste-derived alkali-activated binder system, utilizing rice husk ash as a bio-derived silicate source to entirely replace costly and energy-intensive commercial sodium/potassium silicate activators. Uniquely, it integrates palm oil fuel ash or sugarcane bagasse ash with quarry dust as partial replacements for ground-granulated blast-furnace slag and river sand, respectively, in a coordinated mix design optimized for synergistic performance. This novel framework valorises agricultural and industrial by-products, reducing reliance on non-renewable resources and mitigating environmental impacts. Experimental results demonstrate that 20% quarry dust substitution in NaOH− rice husk ash based ambient-cured alkali-activated binders achieves a high compressive strength of 68.93&#xa0;MPa, driven by enhanced particle packing and dense C–(A)–S–H gel formation. The NaOH + rice husk ash activator outperforms KOH+  rice husk ash, yielding up to 62.39&#xa0;MPa with 10% palm oil fuel ash/sugarcane bagasse ash ash substitution, alongside lower water absorption (&lt; 3%) due to refined microstructures. However, higher palm oil fuel ash/sugarcane bagasse ash replacements (20–30%) increase porosity, elevating sorptivity (up to 0.0084&#xa0;mm/s<sup>0.5</sup>) and reducing sulphate resistance, with compressive strength losses of 10–20% after 56&#xa0;days of MgSO<sub>4</sub> exposure due to ettringite formation. This research’s final goal is to provide a scalable, eco-friendly blueprint for high-performance alkali-activated binders, offering practical substitution thresholds (20% quarry dust, 10% palm oil fuel ash/palm oil fuel ash) to balance mechanical strength and durability for sustainable construction applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Mechanical and durability properties of rice husk ash included sugar cane bagasse ash or palm oil fuel ash based alkali-activated binders

  • 期刊论文

  • 发表日期：

    2026年1月5日

查看全文
  • Kumar Gedela Santhosh,
  • Sk M. Subhani,
  • A. Bahurudeen

摘要

The environmental burden of ordinary Portland cement production, contributing 8% of global CO2 emissions, necessitates sustainable alternatives like alkali-activated binders. This study introduces a pioneering approach by developing a fully waste-derived alkali-activated binder system, utilizing rice husk ash as a bio-derived silicate source to entirely replace costly and energy-intensive commercial sodium/potassium silicate activators. Uniquely, it integrates palm oil fuel ash or sugarcane bagasse ash with quarry dust as partial replacements for ground-granulated blast-furnace slag and river sand, respectively, in a coordinated mix design optimized for synergistic performance. This novel framework valorises agricultural and industrial by-products, reducing reliance on non-renewable resources and mitigating environmental impacts. Experimental results demonstrate that 20% quarry dust substitution in NaOH− rice husk ash based ambient-cured alkali-activated binders achieves a high compressive strength of 68.93 MPa, driven by enhanced particle packing and dense C–(A)–S–H gel formation. The NaOH + rice husk ash activator outperforms KOH+  rice husk ash, yielding up to 62.39 MPa with 10% palm oil fuel ash/sugarcane bagasse ash ash substitution, alongside lower water absorption (< 3%) due to refined microstructures. However, higher palm oil fuel ash/sugarcane bagasse ash replacements (20–30%) increase porosity, elevating sorptivity (up to 0.0084 mm/s0.5) and reducing sulphate resistance, with compressive strength losses of 10–20% after 56 days of MgSO4 exposure due to ettringite formation. This research’s final goal is to provide a scalable, eco-friendly blueprint for high-performance alkali-activated binders, offering practical substitution thresholds (20% quarry dust, 10% palm oil fuel ash/palm oil fuel ash) to balance mechanical strength and durability for sustainable construction applications.