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<p>In this analysis, the blend of sodium hydroxide and sodium silicate, rice husk ash, coal bottom ash and basalt fibres are employed to prepare geopolymer concrete. Partial replacement of sand and fibre reinforcement in geopolymer concrete is provided. The Na<sub>2</sub>SiO<sub>3</sub> to NaOH ratio, Alkaline Activator to Binder Content, and sodium hydroxide concentration are all kept at 2.0, 0.4 and 12&#xa0;M, respectively, the rice husk ash used in the control mix (MRCM)is 500&#xa0;kg/m<sup>3</sup>. Alumina is added only to the control mix so that the ratio of Si/Al should remain equal to or about 3 for the formation of alumino-silicate hydrates. In the 20MRB-0.1, 30MRB-0.5, 40MRB-1, 50MRB-1.5, 60MRB-2 and 70MRB-2.5, combinations, coal bottom ash are added as a replacement of fine aggregates (by weight) by 20, 30, 40, 50,60 and 70% and the numeral 0.1–2.5 in the mixes denotes the percentage of fibres in the mixes by weight of Geopolymer concrete. The results of rice husk ash, coal bottom ash and fibre samples are compared to the MRCM. The results reveal that mix 40MRB-1 is strong, abrasion-resistant, and less water absorbent when compared to the control and all other blends. In comparison to the MRCM, 40MRB-1 has achieved better workability. The compressive strength of 40MRB-1 increased by more than 29, 19, and 18% after 7, 28, and 90&#xa0;days respectively. The abrasion resistance increased by more than 85, 88, and 98% after 7, 28, and 90&#xa0;days, respectively. The precise elemental composition of the GPC mixes provided by EDS revealed that they are rich in alumina and silica. The mix including 40% CBA and 1% BS fibres achieved a high Si/Al ratio of 0.28 and a low Ca/Si ratio of 3.4, suggesting a high-strength blend. The regression analysis revealed that 7-, 28-, and 90-day split tensile strength, flexural strength, abrasion resistance, and water absorption have significant linear relationships with the square root of 28-day compressive strength, with R<sup>2</sup> values ranging from 0.644 to 0.905 and significant parabolic correlations were also identified with fibre factor with R<sup>2</sup> value ranging from 0.622 to 0.971.</p> Graphical abstract <p></p>

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Exploring the sustainability potential of geopolymer concrete with coal bottom ash and basalt fibres

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Mahapara Abbass,
  • Shalom Akhai

摘要

In this analysis, the blend of sodium hydroxide and sodium silicate, rice husk ash, coal bottom ash and basalt fibres are employed to prepare geopolymer concrete. Partial replacement of sand and fibre reinforcement in geopolymer concrete is provided. The Na2SiO3 to NaOH ratio, Alkaline Activator to Binder Content, and sodium hydroxide concentration are all kept at 2.0, 0.4 and 12 M, respectively, the rice husk ash used in the control mix (MRCM)is 500 kg/m3. Alumina is added only to the control mix so that the ratio of Si/Al should remain equal to or about 3 for the formation of alumino-silicate hydrates. In the 20MRB-0.1, 30MRB-0.5, 40MRB-1, 50MRB-1.5, 60MRB-2 and 70MRB-2.5, combinations, coal bottom ash are added as a replacement of fine aggregates (by weight) by 20, 30, 40, 50,60 and 70% and the numeral 0.1–2.5 in the mixes denotes the percentage of fibres in the mixes by weight of Geopolymer concrete. The results of rice husk ash, coal bottom ash and fibre samples are compared to the MRCM. The results reveal that mix 40MRB-1 is strong, abrasion-resistant, and less water absorbent when compared to the control and all other blends. In comparison to the MRCM, 40MRB-1 has achieved better workability. The compressive strength of 40MRB-1 increased by more than 29, 19, and 18% after 7, 28, and 90 days respectively. The abrasion resistance increased by more than 85, 88, and 98% after 7, 28, and 90 days, respectively. The precise elemental composition of the GPC mixes provided by EDS revealed that they are rich in alumina and silica. The mix including 40% CBA and 1% BS fibres achieved a high Si/Al ratio of 0.28 and a low Ca/Si ratio of 3.4, suggesting a high-strength blend. The regression analysis revealed that 7-, 28-, and 90-day split tensile strength, flexural strength, abrasion resistance, and water absorption have significant linear relationships with the square root of 28-day compressive strength, with R2 values ranging from 0.644 to 0.905 and significant parabolic correlations were also identified with fibre factor with R2 value ranging from 0.622 to 0.971.

Graphical abstract