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<p>This study investigates the possibility of utilizing recycled brick aggregate (RBA) for producing self-compacting concrete (SCC) by using it as both coarse and fine aggregates. For this investigation, ten mix designs were developed with nominal maximum size of RBA as 15&#xa0;mm and 20&#xa0;mm. Recycled brick fine aggregate (RBFA) and natural river sand (NS) were used as fine aggregate. As binder, CEM Type I cement and blended cement with partial replacement (by volume) of CEM Type I by fly ash (20%), slag (20%), and silica fume (10%) were used. Water-to-binder ratio (W/B), sand-to-aggregate volume ratio (s/a), and cement content were 0.35, 0.50, and 500&#xa0;kg/m<sup>3</sup>, respectively. The dosing of high-range water-reducing admixture was adjusted for fresh properties. The fresh tests included slump flow, J-Ring, and V-Funnel (for filling capacity). Hardened properties such as compressive strength, ultrasonic pulse velocity (UPV), and chloride permeability were evaluated. The microstructure of concrete was visualized using a scanning electron microscope (SEM). The flow diameter varied from 535 to 732&#xa0;mm for all cases, and the V-Funnel time was around 6 to 12&#xa0;s for certain cases. SCC can be effectively made with RBA and RBFA with compressive strength varying from 29 to 46&#xa0;MPa. Chloride permeability reduced significantly for the mixes made with mineral admixtures, particularly for silica fume. Weak interfacial transition zones (ITZs) in and around RBA and deposits of calcium carbonate were also found in the adhered mortar of RBA.</p>

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Fresh and hardened properties of self-compacting concrete prepared using recycled brick aggregate

  • 期刊论文

  • 发表日期：

    2025年5月26日

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  • Tarek Uddin Mohammed,
  • Muhtadee-Ur-Rahman Chowdhury,
  • Abu Rafe Faiyaz,
  • Arian Asib,
  • Md. Aktaruzzaman Rony

摘要

This study investigates the possibility of utilizing recycled brick aggregate (RBA) for producing self-compacting concrete (SCC) by using it as both coarse and fine aggregates. For this investigation, ten mix designs were developed with nominal maximum size of RBA as 15 mm and 20 mm. Recycled brick fine aggregate (RBFA) and natural river sand (NS) were used as fine aggregate. As binder, CEM Type I cement and blended cement with partial replacement (by volume) of CEM Type I by fly ash (20%), slag (20%), and silica fume (10%) were used. Water-to-binder ratio (W/B), sand-to-aggregate volume ratio (s/a), and cement content were 0.35, 0.50, and 500 kg/m3, respectively. The dosing of high-range water-reducing admixture was adjusted for fresh properties. The fresh tests included slump flow, J-Ring, and V-Funnel (for filling capacity). Hardened properties such as compressive strength, ultrasonic pulse velocity (UPV), and chloride permeability were evaluated. The microstructure of concrete was visualized using a scanning electron microscope (SEM). The flow diameter varied from 535 to 732 mm for all cases, and the V-Funnel time was around 6 to 12 s for certain cases. SCC can be effectively made with RBA and RBFA with compressive strength varying from 29 to 46 MPa. Chloride permeability reduced significantly for the mixes made with mineral admixtures, particularly for silica fume. Weak interfacial transition zones (ITZs) in and around RBA and deposits of calcium carbonate were also found in the adhered mortar of RBA.