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This study investigates the microstructural propertiesGlass of mortars and concrete incorporating waste glass (WG)Waste Glass (WG) fine aggregate and rice husk ash (RHA)Rice Husk Ash (RHA) as a supplementary cementitious material. The primary objective was to evaluate the effectiveness of RHARice Husk Ash (RHA) in mitigating the deleterious effects of alkali-silica reaction (ASRAlkali-Silica Reaction (ASR)), which is a major concern when using reactive WGWaste Glass (WG) aggregates. Mortar and concrete specimens were prepared with varying proportions of RHARice Husk Ash (RHA) and WGWaste Glass (WG) and subjected to ASRAlkali-Silica Reaction (ASR) tests in accordance with ASTM C1567 procedures. Microstructural analysis was performed using Scanning Electron Microscopy (SEM)Scanning Electron Microscopy (SEM), Energy Dispersion Spectroscopy (EDS)Energy Dispersion Spectroscopy (EDS), and X-ray Diffraction (XRDX-ray Diffraction (XRD)) to examine ASRAlkali-Silica Reaction (ASR) gel formation, elemental composition, and phase identification. The results from SEMScanning Electron Microscopy (SEM) micrographs showed that while the control mortar (100% Ordinary Portland Cement) suffered severe damage from ASRAlkali-Silica Reaction (ASR) gel, RHARice Husk Ash (RHA)-containing specimens exhibited little to no visible gel formation. EDSEnergy Dispersion Spectroscopy (EDS) analysis revealed that the elemental composition of the ASRAlkali-Silica Reaction (ASR) gel was similar across all samples, suggesting that RHARice Husk Ash (RHA)’s mechanism of action is primarily to reduce the volume of the gel rather than altering its fundamental properties. XRDX-ray Diffraction (XRD) analysis confirmed the presence of key phases like Tridymite (SiO2), Slaked lime (Ca(OH)2), and Calcium Silicate Hydrate (C-S-H), with C-S-H content correlating with the mechanical properties of the mortars. The findings demonstrate that RHARice Husk Ash (RHA) is a highly effective mitigating agent for ASRAlkali-Silica Reaction (ASR) in concrete containing waste glassWaste Glass (WG), with a 12.5% replacement level being optimal for promoting an environmentally friendly and durable concrete product.

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Effect of Rice Husk Ash and Waste Glass on the Microstructure of Glass Concrete

  • 会议论文

  • 发表日期：

    2026年

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  • Hadi Ibrahim Bello,
  • Kator Jeff Jomboh,
  • Zainab Shehu Aliyu,
  • Yakubu Abdullahi,
  • Lawan Umar Grema

摘要

This study investigates the microstructural propertiesGlass of mortars and concrete incorporating waste glass (WG)Waste Glass (WG) fine aggregate and rice husk ash (RHA)Rice Husk Ash (RHA) as a supplementary cementitious material. The primary objective was to evaluate the effectiveness of RHARice Husk Ash (RHA) in mitigating the deleterious effects of alkali-silica reaction (ASRAlkali-Silica Reaction (ASR)), which is a major concern when using reactive WGWaste Glass (WG) aggregates. Mortar and concrete specimens were prepared with varying proportions of RHARice Husk Ash (RHA) and WGWaste Glass (WG) and subjected to ASRAlkali-Silica Reaction (ASR) tests in accordance with ASTM C1567 procedures. Microstructural analysis was performed using Scanning Electron Microscopy (SEM)Scanning Electron Microscopy (SEM), Energy Dispersion Spectroscopy (EDS)Energy Dispersion Spectroscopy (EDS), and X-ray Diffraction (XRDX-ray Diffraction (XRD)) to examine ASRAlkali-Silica Reaction (ASR) gel formation, elemental composition, and phase identification. The results from SEMScanning Electron Microscopy (SEM) micrographs showed that while the control mortar (100% Ordinary Portland Cement) suffered severe damage from ASRAlkali-Silica Reaction (ASR) gel, RHARice Husk Ash (RHA)-containing specimens exhibited little to no visible gel formation. EDSEnergy Dispersion Spectroscopy (EDS) analysis revealed that the elemental composition of the ASRAlkali-Silica Reaction (ASR) gel was similar across all samples, suggesting that RHARice Husk Ash (RHA)’s mechanism of action is primarily to reduce the volume of the gel rather than altering its fundamental properties. XRDX-ray Diffraction (XRD) analysis confirmed the presence of key phases like Tridymite (SiO2), Slaked lime (Ca(OH)2), and Calcium Silicate Hydrate (C-S-H), with C-S-H content correlating with the mechanical properties of the mortars. The findings demonstrate that RHARice Husk Ash (RHA) is a highly effective mitigating agent for ASRAlkali-Silica Reaction (ASR) in concrete containing waste glassWaste Glass (WG), with a 12.5% replacement level being optimal for promoting an environmentally friendly and durable concrete product.