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<p>The sustainability of recycled glass in concrete closely depends on the ability to mitigate the alkali-silica reaction (ASR), a significant challenge stemming from the chemical incompatibility between glass and cement. Accordingly, this study aims to quantify the coupled effects of recycled laminated glass particle size and glass-powder (GP) fineness, under ASR-promoting conditions, on the dimensional stability of self-compacting concrete (SCC). It relates these effects to mechanical performance and transport properties and elucidates the underlying mechanisms through microstructural analyses. Three aggregate sizes (3/8, 8/12.5, and 8/16&#xa0;mm) and two GP Blaine values (3570 and 5797 cm<sup>2</sup>/g) were incorporated into SCC mixes and cured for 365&#xa0;days in baths at 38&#xa0;°C, with or without NaOH added to the mixing water. Additionally, mortar specimens were treated in an autoclave at 127 ± 2&#xa0;°C to evaluate dimensional variations. The results highlight the importance of particle sizes and glass powder fineness. Microstructural analyses (XRD, TGA/DTA, and SEM/EDX) revealed significant pozzolanic activity of the finer glass powder, reducing calcium hydroxide content and promoting C-S–H gel formation with lower Ca/Si ratios. High-fineness glass powder also showed notable benefits in improving compressive strength and reducing permeability, enhancing the concrete’s ability to limit chloride ion diffusion. Conversely, larger glass aggregates (8/16&#xa0;mm) caused more significant expansion than smaller aggregates (8/12.5&#xa0;mm).</p>

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Effects of aggregate size and glass powder fineness on the performance and durability of self-compacting concrete with recycled laminated glass

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Sacia Kirane,
  • Fatma Zohra Melais,
  • Nourredine Arabi,
  • Karim Belmokretar,
  • Rachida Idir,
  • Kamar Dorbani,
  • Dallel Draghmia

摘要

The sustainability of recycled glass in concrete closely depends on the ability to mitigate the alkali-silica reaction (ASR), a significant challenge stemming from the chemical incompatibility between glass and cement. Accordingly, this study aims to quantify the coupled effects of recycled laminated glass particle size and glass-powder (GP) fineness, under ASR-promoting conditions, on the dimensional stability of self-compacting concrete (SCC). It relates these effects to mechanical performance and transport properties and elucidates the underlying mechanisms through microstructural analyses. Three aggregate sizes (3/8, 8/12.5, and 8/16 mm) and two GP Blaine values (3570 and 5797 cm2/g) were incorporated into SCC mixes and cured for 365 days in baths at 38 °C, with or without NaOH added to the mixing water. Additionally, mortar specimens were treated in an autoclave at 127 ± 2 °C to evaluate dimensional variations. The results highlight the importance of particle sizes and glass powder fineness. Microstructural analyses (XRD, TGA/DTA, and SEM/EDX) revealed significant pozzolanic activity of the finer glass powder, reducing calcium hydroxide content and promoting C-S–H gel formation with lower Ca/Si ratios. High-fineness glass powder also showed notable benefits in improving compressive strength and reducing permeability, enhancing the concrete’s ability to limit chloride ion diffusion. Conversely, larger glass aggregates (8/16 mm) caused more significant expansion than smaller aggregates (8/12.5 mm).