在建筑固体废物（固废）激增、“双碳”目标推进的双重驱动下，全再生粗骨料混凝土（简称全再生混凝土、FRCAC，取代率为100%）在结构工程中的应用成为破解资源环境约束、重塑低碳结构体系的突破口。然而现行规范体系因缺乏实际工况下的长期实证数据，制约FRCAC相关的技术更新和规模化应用进程。本文着眼“突破技术瓶颈、驱动规范升级、推动低碳应用”，率先以30 m跨度的FRCAC简支梁为工程原型开展前瞻性探索，旨在全面研究FRCAC结构的服役性能。FRCAC受压区边缘的最大压应力约为混凝土轴心抗压强度的50%，能够模拟FRCAC构件在实际荷载作用下的受力状态，支持量化FRCAC结构在长期荷载 ‒ 环境耦合作用下的性能演化规律与低碳效益。设计并浇筑等配筋、等水胶比的FRCAC梁和普通混凝土（NAC）对照梁，构建覆盖“材料制备 ‒ 构件行为 ‒ 碳效益量化”全链条，追踪4年服役期内变形、裂缝、碳化深度等的演变过程，应用生命周期评价模型获得量化的碳吸收效应。研究结果表明，同条件养护下FRCAC的弹性模量较NAC降低7.8%~14%，可通过预起拱方式补偿变形差异并满足结构变形要求；FRCAC梁表面的受弯裂缝数量较NAC梁增长8%，裂缝长度增长15%，但平均宽度基本一致；考虑服役期的碳吸收后，FRCAC梁的净碳排放降低7.69%。首次以工程原型实证了FRCAC在实际荷载 ‒ 环境耦合工况下的应用可行性，将促进结构工程低碳化的理论与工程发展，推动建筑固废从粗放化填埋转向高值化利用。

As global construction solid wastes surged and to achieve the carbon peak and carbon neutrality goals, the application of fully recycled coarse aggregate concrete (FRCAC, 100% replacement rate) in structural engineering has emerged as a breakthrough solution to addressing resource-environmental constraints and reshaping low-carbon structural systems. However, current codes and standards lack long-term empirical data under actual service conditions, constraining technological updates and large-scale application. This study aims to break technological bottlenecks, drive code upgrades, and promote low-carbon application. It explores the service performance of FRCAC structures using a 30-m-span simply supported beam as the engineering prototype. Under self-weight loading, the maximum compressive stress at the edge of the compression zone of FRCAC is approximately 50% of its axial compressive strength, simulating the stress state under actual loading conditions, thus enabling quantitative analysis of performance evolution mechanisms and low-carbon benefits under long-term coupled effects of mechanical loading and environmental exposure. Through designing comparative beams with equivalent reinforcement and water-to-binder ratios between FRCAC and conventional concrete, we established a comprehensive framework covering material preparation, component behaviors, and carbon benefit quantification. We tracked deformations, crack patterns, and carbonation depth evolution over 4-year service periods, and quantified carbon absorption effects using life cycle assessment models. Results demonstrate that although FRCAC exhibits 7.8%~14% reduced elastic modulus under the same-condition curing, pre-cambering completely compensates deformation discrepancies, satisfying structural requirements. While bending cracks increased by 8% and the crack length increased by 15%, the average width remained comparable to conventional concrete. Considering service-period carbon absorption, FRCAC beams achieved 7.69% reduction in net carbon emissions. This study pioneers engineering prototype validation of FRCAC's feasibility under actual load-environment coupling conditions. The findings are expected to advance the transformation of construction wastes from extensive landfilling to high-value utilization, providing a forward-looking solution for low-carbon structural engineering.