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The rapid increase in waste glass and demolished concrete is a concern because both pollute the environment while also wasting precious land. Their robust application in concrete, particularly in structural elements, has the potential to minimise those wastes drastically and convert them into resources. Considering this situation, this study investigates the flexural response of reinforced concrete (RC) beams containing waste glass (WG) and recycled brick aggregate (RBA). The WG was used as a partial or full replacement of fine aggregate with RBA concrete to produce RC beams. Primarily, the basic concrete tests for measuring physical, fresh, and hardened properties, such as density, gradation, air content, slump, and flexural strength of RBA-based concrete with glass (RCG), are evaluated according to ASTM standards. Then, a total of twelve RC beam specimens with different proportions of WG and RBA were prepared, cured, and tested under a four-point bending test in a Universal Testing Machine (UTM). Test results showed that the load-carrying capacity of RCG beams was decreased by 8.5–9.9% only when the glass content was increased up to 25% replacement. Flexural strength may be affected by the relatively weaker strength properties of recycled concrete with glass (RCG). The majority of cracks initiate at the flexural zones, though the final failures occurred in the concrete with a general combination of shear and flexure in many cases. Finally, the flexural strength of the beams is compared to predictions from CSA 2004, EC2, and ACI-318, and it is observed that the ratio of experimental moment capacity to theoretical moment capacity ranges from 0.8 to 1.3. These disparities in moment capacity (particularly for ratios below 1.0) demonstrate the need for revisions to the existing code provisions to accurately predict the flexural capacity of RCG beams.
Ahmed et al. (Sat,) studied this question.