Target‐strength‐based optimal mix proportion of high strength fully recycled coarse aggregate concrete ( HSFRCAC ) considering comprehensive performance

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Abstract High strength fully recycled coarse aggregate concrete has significant potential in structural applications, yet its broader adoption depends on a rational mix proportion design that balances performance, environmental impact and cost. Conventional methods often target a single performance requirement and neglect these trade‐offs. This study conducted an orthogonal experimental study to evaluate the influence of key factors on workability, compressive strength, environmental impact and cost. Results under a same water‐binder ratio, the paste–aggregate ratio plays a decisive role in workability as well as environmental impact and cost, while silica fume content and sand ratio are the dominant factors governing strength. Furthermore, the optimal mixtures corresponding to target strengths of 60–95 MPa were identified by applying a performance–cost efficiency model, with compressive strength as the core objective. Since the optimal mix proportions vary depending on the selected evaluation criterion, the final result should be guided by the practical engineering project.

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