Duan Xiaopei, Wang Yimin, Yang Duowang, Zeng Wei, Du Yanqing, Li Ning
School of Civil Engineering & Transportation, South China University of Technology, Guangzhou, 510641, China.
Tianjin Municipal Engineering Design & Research Institute Co., Ltd., Tianjin, 300392, China.
Sci Rep. 2025 Aug 11;15(1):29395. doi: 10.1038/s41598-025-13354-z.
This study deals with the problem of consumption of construction waste and shortage of traditional construction materials, offering a technical and environmental basis for the recycling and utilization of construction and demolition waste (CDW). Using waste concrete and waste bricks as recycled aggregates for pavement base materials, and cement, lime and fly ash as stabilizers, this study systematically explores the feasibility of stabilizing recycled aggregate-based materials for road use. The basic physical properties and macro-mechanical properties are analyzed, and the effects of stabilizer dosage (ESR), recycled aggregate dosage (RASR), and brick-concrete ratio (BCR) on the roadability of stabilized recycled aggregate materials are investigated. Revealing the significance and critical effects of multi-factors of strength development. Life cycle assessment (LCA) method is employed to measure the carbon emissions of different materials used as road pavement sub-base and compare them with those of natural aggregates. The results show that stabilized construction waste recycled aggregate is suitable for road subgrade. ESR, RASR and BCR have a significant effect on it with the order of BCR > RASR > ESR. The optimum ratio exists at 30% ~ 45% recycled aggregate blending and 1:2 of BCR. The carbon emission of cement stabilized class can be reduced from 60,789.66 to 48,117.03 kgCO by using recycled construction waste aggregate instead of natural aggregate during construction period based on the base unit (a flow section length of 500 m as the basic unit), which is 19.2% reduction in carbon emission. For the lime fly ash stabilized category, the carbon emission is reduced from 53,246.65 to 41,734.03 kgCO, which is 21.6% reduction in carbon emission. Recycled aggregates alone can achieve carbon emission reductions of 82.27%, 81.23%, and 78.02%, demonstrating a substantial environmental benefit in carbon reduction.
本研究针对建筑垃圾的消耗问题以及传统建筑材料的短缺问题展开，为建筑拆除废弃物（CDW）的回收利用提供技术和环境依据。本研究以废弃混凝土和废砖作为路面基层材料的再生骨料，并以水泥、石灰和粉煤灰作为稳定剂，系统地探究了稳定化再生骨料材料用于道路的可行性。分析了其基本物理性能和宏观力学性能，并研究了稳定剂用量（ESR）、再生骨料用量（RASR）和砖-混凝土比（BCR）对稳定化再生骨料材料路用性能的影响。揭示了强度发展多因素的重要性和关键作用。采用生命周期评估（LCA）方法来测量用作道路路面底基层的不同材料的碳排放，并将其与天然骨料的碳排放进行比较。结果表明，稳定化建筑垃圾再生骨料适用于道路路基。ESR、RASR和BCR对其有显著影响，影响顺序为BCR＞RASR＞ESR。最佳比例存在于再生骨料掺量为30%~45%且BCR为1:2时。以施工期基于基本单元（以500m的流水段长度为基本单元）计算，使用再生建筑垃圾骨料代替天然骨料，水泥稳定类的碳排放量可从60789.66kgCO降至48117.03kgCO，碳排放量减少了19.2%。对于石灰粉煤灰稳定类，碳排放量从53246.65kgCO降至41734.03kgCO，碳排放量减少了21.6%。仅使用再生骨料就能实现82.27%、81.23%和78.02%的碳排放量减少，在碳减排方面展现出显著的环境效益。
