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<p>This study focuses on the sustainable manufacture of eco-friendly lightweight aggregates (LWA) using anthropogenic wastes, namely brick wastes (BW), urban sewage sludge (SS), and marble wastes (MW), as an alternative to depleting natural resources. The process serves dual purposes by preventing resource exhaustion and preserving geological heritage while inertizing and recycling waste into a valuable product. Various LWA manufacturing tests were conducted with different proportions of BW, SS, and MW. Initial tests involved samples with 5%, 10%, and 20% SS, and 1%, 2%, and 4% CaCO<sub>3</sub> as MW. Waste material analysis revealed the composition of BW, SS, and MW. Sintering at 1280&#xa0;°C and 1250&#xa0;°C for LWA with 20% SS yielded pellets meeting UNE-EN-13055-1, 2003 standards with acceptable water absorption and compressive strength (0.7&#xa0;MPa − 1.84&#xa0;MPa), comparable to commercial LWAs. Environmental assessment through leaching tests confirmed the inert nature of the aggregates in pure water (pH 4.5), with no leaching or migration of trace elements. Aggregates containing 10% and 20% SS demonstrated suitability for agricultural and gardening applications, free from leaching toxic substances. Those without SS or with 5% SS are potential candidates for the building sector, including lightweight concrete and thermal/acoustic insulation preparation.</p>

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“Ecological lightweight aggregates manufacture from brick wastes and sewage sludge”

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Manel Ghorbel Ben Abid,
  • Béchir Moussi,
  • Raafa Sassi,
  • Marguerite Munoz,
  • Sonia Mokni Tlili,
  • Naceur Jedidi

摘要

This study focuses on the sustainable manufacture of eco-friendly lightweight aggregates (LWA) using anthropogenic wastes, namely brick wastes (BW), urban sewage sludge (SS), and marble wastes (MW), as an alternative to depleting natural resources. The process serves dual purposes by preventing resource exhaustion and preserving geological heritage while inertizing and recycling waste into a valuable product. Various LWA manufacturing tests were conducted with different proportions of BW, SS, and MW. Initial tests involved samples with 5%, 10%, and 20% SS, and 1%, 2%, and 4% CaCO3 as MW. Waste material analysis revealed the composition of BW, SS, and MW. Sintering at 1280 °C and 1250 °C for LWA with 20% SS yielded pellets meeting UNE-EN-13055-1, 2003 standards with acceptable water absorption and compressive strength (0.7 MPa − 1.84 MPa), comparable to commercial LWAs. Environmental assessment through leaching tests confirmed the inert nature of the aggregates in pure water (pH 4.5), with no leaching or migration of trace elements. Aggregates containing 10% and 20% SS demonstrated suitability for agricultural and gardening applications, free from leaching toxic substances. Those without SS or with 5% SS are potential candidates for the building sector, including lightweight concrete and thermal/acoustic insulation preparation.