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<p>High-strength geopolymer concrete (HSGPC) has gained significant attention as a sustainable alternative to conventional concrete due to its reduced carbon footprint and utilization of industrial by-products. However, achieving high strength at ambient temperature remains a challenge. This research focuses on analysing the mechanical and micro-structural behaviour of multicomponent binder based HSGPC. In the present study, to achieve the high-strength properties at ambient temperature, multi-component binder system comprising alccofine, granulated blast furnace slag (GBFS), silica fume, fly ash, and ordinary Portland cement has been used. With this quaternary blend of industrial by-products, compressive strength of 60, 80, and 100&#xa0;MPa concrete is achieved at room temperature curing conditions. Mechanical properties viz, splitting tensile strength and flexural strength are investigated. Microstructure characteristics are examined through scanning electron microscopy, energy dispersive spectroscopy, back scatter electron microscopy (BSE), Fourier transformation and infrared radiation, and X-ray diffraction techniques. From the results of mechanical properties, it is observed that alccofine improved flexural strength by 66% and splitting tensile strength by 10% compared to mix without alccofine. Microstructure characteristics depicted additional amorphous calcareous and siliceous-rich products aiding polymerization and polycondensation at ambient temperature with an improved ITZ. From the BSE analysis, it is evident that with an increase in the molarity of NaOH, there is an increase in the reactivity of binders leading to fewer unreacted particles. From the FTIR analysis, it was observed that the use of a higher amount of GBFS alone would not help achieve higher strength, as Ca bonds are weaker than Si bonds. The Young's modulus and splitting tensile strength were lower, indicating that the initial stiffness of concrete is low, while the flexural strength was high. The constitutive model developed has a good correlation with experimental results. </p>

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A study on the strength and microstructure properties of high strength geopolymer concrete (HSGPC)

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Padakanti Rakesh,
  • Sarella Venkateswara Rao,
  • Pancharathi Rathish Kumar,
  • Jorge De Brito

摘要

High-strength geopolymer concrete (HSGPC) has gained significant attention as a sustainable alternative to conventional concrete due to its reduced carbon footprint and utilization of industrial by-products. However, achieving high strength at ambient temperature remains a challenge. This research focuses on analysing the mechanical and micro-structural behaviour of multicomponent binder based HSGPC. In the present study, to achieve the high-strength properties at ambient temperature, multi-component binder system comprising alccofine, granulated blast furnace slag (GBFS), silica fume, fly ash, and ordinary Portland cement has been used. With this quaternary blend of industrial by-products, compressive strength of 60, 80, and 100 MPa concrete is achieved at room temperature curing conditions. Mechanical properties viz, splitting tensile strength and flexural strength are investigated. Microstructure characteristics are examined through scanning electron microscopy, energy dispersive spectroscopy, back scatter electron microscopy (BSE), Fourier transformation and infrared radiation, and X-ray diffraction techniques. From the results of mechanical properties, it is observed that alccofine improved flexural strength by 66% and splitting tensile strength by 10% compared to mix without alccofine. Microstructure characteristics depicted additional amorphous calcareous and siliceous-rich products aiding polymerization and polycondensation at ambient temperature with an improved ITZ. From the BSE analysis, it is evident that with an increase in the molarity of NaOH, there is an increase in the reactivity of binders leading to fewer unreacted particles. From the FTIR analysis, it was observed that the use of a higher amount of GBFS alone would not help achieve higher strength, as Ca bonds are weaker than Si bonds. The Young's modulus and splitting tensile strength were lower, indicating that the initial stiffness of concrete is low, while the flexural strength was high. The constitutive model developed has a good correlation with experimental results.