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<p>This study investigates the long-term mechanical, durability and microstructural performance of concrete made with recycled brick aggregate (RBA) and re-recycled brick aggregate (RRBA) under 12 years of atmospheric exposure. Virgin brick aggregate (BA) was also investigated as a control case. Cylindrical concrete samples of 100&#xa0;mm (diameter) x 200&#xa0;mm (height) were prepared with water-to-cement ratio (W/C) of 0.45, sand-to-aggregate volume ratio (s/a) of 0.33 and cement content of 380&#xa0;kg/m<sup>3</sup>. The conducted tests included compressive strength of concrete at 28 days and after 12 years of atmospheric exposure, unit weight of concrete, absorption capacity, void, carbonation depth and ultrasonic pulse velocity (UPV). After 12 years, compressive strengths reached 35&#xa0;MPa for RBA concrete and 42&#xa0;MPa for RRBA concrete, reflecting increases of 35% and 42%, respectively, while the strength of BA concrete remained around 23&#xa0;MPa. RBA and RRBA concretes also exhibited lower absorption (11.5%, 10.9%) and voids (24%, 22.9%) than BA (13.7%, 28%). Carbonation depths were 28&#xa0;mm (BA), 19&#xa0;mm (RBA) and 20&#xa0;mm (RRBA) with corresponding carbonation coefficients of 7.98, 5.57 and 5.91&#xa0;mm/√year. Interfacial transition zones (ITZs) were also investigated using a scanning electron microscope (SEM), deposits of CaCO<sub>3</sub> were found in the outer region of the specimens due to the carbonation of the concrete. These results confirm the long-term performance and durability of RBA and RRBA as sustainable alternatives to conventional coarse aggregates, supporting circular economy practices and Sustainable Development Goal 12 by reducing resource consumption and environmental impact.</p> Graphical abstract <p></p>

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Durability of concrete containing recycled brick aggregate over 12 years in atmospheric exposure

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Tarek Uddin Mohammed,
  • Md. Aktaruzzaman Rony,
  • Naba Uddin,
  • Haisam Bin Mahbub

摘要

This study investigates the long-term mechanical, durability and microstructural performance of concrete made with recycled brick aggregate (RBA) and re-recycled brick aggregate (RRBA) under 12 years of atmospheric exposure. Virgin brick aggregate (BA) was also investigated as a control case. Cylindrical concrete samples of 100 mm (diameter) x 200 mm (height) were prepared with water-to-cement ratio (W/C) of 0.45, sand-to-aggregate volume ratio (s/a) of 0.33 and cement content of 380 kg/m3. The conducted tests included compressive strength of concrete at 28 days and after 12 years of atmospheric exposure, unit weight of concrete, absorption capacity, void, carbonation depth and ultrasonic pulse velocity (UPV). After 12 years, compressive strengths reached 35 MPa for RBA concrete and 42 MPa for RRBA concrete, reflecting increases of 35% and 42%, respectively, while the strength of BA concrete remained around 23 MPa. RBA and RRBA concretes also exhibited lower absorption (11.5%, 10.9%) and voids (24%, 22.9%) than BA (13.7%, 28%). Carbonation depths were 28 mm (BA), 19 mm (RBA) and 20 mm (RRBA) with corresponding carbonation coefficients of 7.98, 5.57 and 5.91 mm/√year. Interfacial transition zones (ITZs) were also investigated using a scanning electron microscope (SEM), deposits of CaCO3 were found in the outer region of the specimens due to the carbonation of the concrete. These results confirm the long-term performance and durability of RBA and RRBA as sustainable alternatives to conventional coarse aggregates, supporting circular economy practices and Sustainable Development Goal 12 by reducing resource consumption and environmental impact.

Graphical abstract