Feasibility of Full-Range Replacement of Natural Coarse Aggregates with Recycled Foam Concrete Aggregate: Effects on Rheology, Mechanical Degradation, and Shear Resistance

> 0.85) with non-destructive strength prediction is ultimately obtained. Based on the balance between mechanical capacity and resource cyclability, an optimal alternative zone of 20% to 40% is proposed. This work not only provides a mechanism for multi-scale coupling between pore structure and structural properties but also provides a data-driven method for the safety assessment of lightweight recycled aggregate concrete (RAC).