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<p>The utilization of industrial by-products and waste materials in the preparation of sustainable aluminosilicate binders is gaining significant attention for reducing the depletion of natural resources and managing waste effectively. This study investigates the compressive strength and microstructural properties of geopolymer binders incorporating slag (GGBS) and waste glass powder (WGP) in varying proportions. The binders were activated using a combination of sodium silicate and sodium hydroxide solutions, with an alkaline-to-binder ratio of 0.55, and cured under ambient conditions. Experimental findings revealed that substituting 20% WGP into the GGBS-based geopolymer achieved the highest compressive strength of 52.86&#xa0;MPa, which represents a 4.89% increase compared to the reference mix (100% GGBS, 50.4&#xa0;MPa). However, higher WGP substitutions resulted in strength reductions, with compressive strengths of 41.42&#xa0;MPa, 24.62&#xa0;MPa, and 15.76&#xa0;MPa for 40%, 60%, and 80% WGP substitutions, respectively. Microstructural analyses, including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectrometry (FTIR), confirmed the formation of three-dimensional aluminosilicate gels ((C, N)-A-S-H) as the primary reaction products. These results demonstrate the potential of incorporating WGP into GGBS-based geopolymers to create sustainable and efficient construction materials.</p>

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Strength and microstructural characteristics of sustainable aluminosilicate binder using waste glass powder and ground granulated blast furnace slag

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • P. Manikandan,
  • V. Prem Kumar,
  • V. Vasugi

摘要

The utilization of industrial by-products and waste materials in the preparation of sustainable aluminosilicate binders is gaining significant attention for reducing the depletion of natural resources and managing waste effectively. This study investigates the compressive strength and microstructural properties of geopolymer binders incorporating slag (GGBS) and waste glass powder (WGP) in varying proportions. The binders were activated using a combination of sodium silicate and sodium hydroxide solutions, with an alkaline-to-binder ratio of 0.55, and cured under ambient conditions. Experimental findings revealed that substituting 20% WGP into the GGBS-based geopolymer achieved the highest compressive strength of 52.86 MPa, which represents a 4.89% increase compared to the reference mix (100% GGBS, 50.4 MPa). However, higher WGP substitutions resulted in strength reductions, with compressive strengths of 41.42 MPa, 24.62 MPa, and 15.76 MPa for 40%, 60%, and 80% WGP substitutions, respectively. Microstructural analyses, including scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectrometry (FTIR), confirmed the formation of three-dimensional aluminosilicate gels ((C, N)-A-S-H) as the primary reaction products. These results demonstrate the potential of incorporating WGP into GGBS-based geopolymers to create sustainable and efficient construction materials.