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<p>Waste materials are increasingly being used as substitutes for conventional coarse aggregate (CCA) in concrete. This study investigated the use of recycled refractory brick aggregate (RBWA) from demolished furnace walls as a partial CCA substitute in eco-friendly concrete production. Concrete mixtures with 0, 15, 30, and 50% replacement of CCA with RBWA and water–cement (w/c) ratios of 0.52 and 0.49 were prepared. The concrete slump, density, compressive strength, flexural strength, porosity, ultrasonic pulse velocity (UPV), and relationship between flexural stress and response time were tested. Acceptance parameters (AP) for the UPV (AP<sub>UPV</sub>) and flexural strength (AP<sub>FS</sub>) of RBWA-modified concrete were established. The RBWA mixtures had higher slumps and lower densities than corresponding ordinary concrete (OC) mixtures. Mixtures with 15%, 30%, and 50% RBWA had porosities of approximately 10.96–11.55%, 21.79–22.37%, and 27.17–30.45%, respectively—higher than those of OC mixtures. This reduced the compressive strength by approximately 10.96–30.45%, flexural strength by 3.85–23.54%, and UPV by 0.76–5.24% for RBWA substitutions of 15–50%. Nevertheless, the AP<sub>UPV</sub> and AP<sub>FS</sub> values for the RBWA concretes were more than 75% of those of OC, indicating that RBWA is feasible as a partial replacement for CCA. The brittleness of RBWA concrete and OC were similar. All RBWA concrete samples required less time than OC samples to reach elastic and peak modes. The study findings demonstrate the potential of RBWA to replace up to 50% of CCA in concrete pavements for light-traffic roads.</p>

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Flexural Strength of Beam Specimens Using Alumina-Type Refractory Brick Waste as Coarse Aggregate

  • 期刊论文

  • 发表日期：

    2025年1月13日

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  • Komang Saka Suwindu,
  • Muhammad Akbar Caronge,
  • Muhammad Wihardi Tjaronge

摘要

Waste materials are increasingly being used as substitutes for conventional coarse aggregate (CCA) in concrete. This study investigated the use of recycled refractory brick aggregate (RBWA) from demolished furnace walls as a partial CCA substitute in eco-friendly concrete production. Concrete mixtures with 0, 15, 30, and 50% replacement of CCA with RBWA and water–cement (w/c) ratios of 0.52 and 0.49 were prepared. The concrete slump, density, compressive strength, flexural strength, porosity, ultrasonic pulse velocity (UPV), and relationship between flexural stress and response time were tested. Acceptance parameters (AP) for the UPV (APUPV) and flexural strength (APFS) of RBWA-modified concrete were established. The RBWA mixtures had higher slumps and lower densities than corresponding ordinary concrete (OC) mixtures. Mixtures with 15%, 30%, and 50% RBWA had porosities of approximately 10.96–11.55%, 21.79–22.37%, and 27.17–30.45%, respectively—higher than those of OC mixtures. This reduced the compressive strength by approximately 10.96–30.45%, flexural strength by 3.85–23.54%, and UPV by 0.76–5.24% for RBWA substitutions of 15–50%. Nevertheless, the APUPV and APFS values for the RBWA concretes were more than 75% of those of OC, indicating that RBWA is feasible as a partial replacement for CCA. The brittleness of RBWA concrete and OC were similar. All RBWA concrete samples required less time than OC samples to reach elastic and peak modes. The study findings demonstrate the potential of RBWA to replace up to 50% of CCA in concrete pavements for light-traffic roads.