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<p>This study investigates the mechanical, microstructural, and thermal properties of hybrid geopolymers (GPs) incorporating mineral wool waste (MW) and ground granulated blast furnace slag (GGBS). Two MW types, differing in particle size and morphology, were added at 0–12&#xa0;wt.% into the binder. Mechanical performance was assessed through compressive (CS) and flexural strength (FS), along with capillary water absorption (CWA) and drying shrinkage (DS). Phase composition and microstructure were examined using X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTG), and Fourier-transform infrared (FTIR) spectroscopy, and microstructure through scanning electron microscopy (SEM). A one-way analysis of variance (ANOVA) was conducted to assess the statistical significance of the effects of MW incorporation on the mechanical and durability performance of GP composites, and the results showed that CS decreased with higher MW content due to increased porosity, dropping to 23.43&#xa0;MPa and 24.75&#xa0;MPa for GGBS-MWs and GGBS-MWm, respectively, compared to 31.54&#xa0;MPa in the control. Conversely, FS improved, with the GGBS95-MWs5 and GGBS-MWm mixtures showing enhanced bonding and crack-bridging effects. CWA displayed a strong linear relationship (<i>R</i><sup>2</sup> &gt; 0.97) with time, and the sorptivity coefficient (k) peaked at 0.17684&#xa0;mm/min<sup>1/2</sup> with 15% MW, suggesting optimal MW addition improves impermeability. DS mainly occurred within 14&#xa0;days, with GGBS95-MWm5 showing the highest shrinkage (5249&#xa0;µm/m) and the control the lowest (4002&#xa0;µm/m), linked to denser gel formation. Microstructural and thermal analyses confirmed enhanced gel structure and heat resistance due to MW’s high melting point. Overall, MW enhances selected properties of GGBS-based GPs and offers a sustainable solution for mineral wool waste reuse.</p>

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Enhancing Geopolymer Properties with Mineral Wool Waste: Mechanical, Microstructural, and Thermal Insights

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Ahmed Babeker Elhag,
  • Nejib Ghazouani,
  • Ali Raza

摘要

This study investigates the mechanical, microstructural, and thermal properties of hybrid geopolymers (GPs) incorporating mineral wool waste (MW) and ground granulated blast furnace slag (GGBS). Two MW types, differing in particle size and morphology, were added at 0–12 wt.% into the binder. Mechanical performance was assessed through compressive (CS) and flexural strength (FS), along with capillary water absorption (CWA) and drying shrinkage (DS). Phase composition and microstructure were examined using X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTG), and Fourier-transform infrared (FTIR) spectroscopy, and microstructure through scanning electron microscopy (SEM). A one-way analysis of variance (ANOVA) was conducted to assess the statistical significance of the effects of MW incorporation on the mechanical and durability performance of GP composites, and the results showed that CS decreased with higher MW content due to increased porosity, dropping to 23.43 MPa and 24.75 MPa for GGBS-MWs and GGBS-MWm, respectively, compared to 31.54 MPa in the control. Conversely, FS improved, with the GGBS95-MWs5 and GGBS-MWm mixtures showing enhanced bonding and crack-bridging effects. CWA displayed a strong linear relationship (R2 > 0.97) with time, and the sorptivity coefficient (k) peaked at 0.17684 mm/min1/2 with 15% MW, suggesting optimal MW addition improves impermeability. DS mainly occurred within 14 days, with GGBS95-MWm5 showing the highest shrinkage (5249 µm/m) and the control the lowest (4002 µm/m), linked to denser gel formation. Microstructural and thermal analyses confirmed enhanced gel structure and heat resistance due to MW’s high melting point. Overall, MW enhances selected properties of GGBS-based GPs and offers a sustainable solution for mineral wool waste reuse.