Abstract: This work investigated the performance degradation mechanisms of recycled aggregates in cement concrete through multi-cycle regeneration processes and their impacts on the mechanical behavior of recycled aggregate concrete (RAC). A synergistic aging protocol combining accelerated carbonation, sustained loading, and freeze-thaw cycles was employed simulate the cumulative damage in pavement concrete under Beijing’s operational conditions. Specimens with 1—3 regeneration cycles (RAC1—RAC3) were systematically evaluated through compressive strength tests, splitting tensile strength measurements, and elastic modulus determinations. Quantitative microstructural characterization via XRF and SEM-EDS revealed progressive accumulation of mortar layers on aggregate surfaces. Porosity doubled in RAC3 compared to virgin aggregates (RAC0), while elemental mapping showed 24.6% and 5.51% enrichment of Si and Al respectively, though XRD analysis confirmed that no new chemical phases were formed. Mechanical degradation exhibits linear correlations with regeneration cycles: 21.6% reduction in compressive strength, 17.8% in tensile strength, and 26.4% in elastic modulus for RAC3. Critical thresholds were identified through parametric analysis: specimens with 50% replacement ratio maintained C40 compliance even after three cycles, demonstrating minimized performance loss. The fundamental mechanism was attributed to stress concentration effects from the thickened interfacial transition zone (ITZ) between aggregates and adhered mortar. These findings propose an optimized regeneration protocol limiting replacement ratios to 50% and regeneration cycles to three, balancing resource efficiency with structural requirements for pavement applications.
索智, 宫臣, 野堯, 赵子豪, 丁习周, 李加禾, 徐士杰. 基于道路服役年限下多循环再生混凝土力学强度损伤演变及机理探究[J]. 材料导报, 2026, 40(9): 25040084-7.
SUO Zhi, GONG Chen, YE Yao, ZHAO Zihao, DING Xizhou, LI Jiahe, XU Shijie. Investigation on the Damage Evolution of Mechanical Strength and Mechanisms in Multi-cycle Recycled Concrete Under Road Service Duration. Materials Reports, 2026, 40(9): 25040084-7.
1 Ding Y, Zhao J, Liu J W, et al.Journal of Cleaner Production, 2021, 293, 126144. 2 Cai L, Zhang P.Energy Conservation & Environmental, 2024(7), 59 (in Chinese). 蔡立奇, 张鹏.节能与环保, 2024(7), 59. 3 An L, Chen W, Zhao T.Materials Reports, 2024, 38(S2), 257 (in Chinese). 安亮, 谌文武, 赵天宇, 等.材料导报, 2024, 38(S2), 257. 4 Marie I, Quiasrawi H.Journal of Cleaner Production, 2012, 37, 243. 5 Thomas C, De Brito J, Cimentada A, et al.Journal of Cleaner Production, 2020, 245, 118843. 6 Salesa Á, Pérez-Benedicto J A, Colorado-Aranguren D, et al.Journal of Cleaner Production, 2017, 141, 248. 7 Salesa Á, Esteban L M, Lopez-Julian P L, et al.Materials, 2022, 15(16), 5714. 8 Salesa Á, Pérez-Benedicto J Á, Esteban L M, et al.Construction and Building Materials, 2017, 153, 364. 9 Zhu P, Hao Y, Liu H, et al.Construction and Building Materials, 2019, 210, 442. 10 Zhu P, Liu W.Journal of Wuhan University of Technology-Mater, 2018, 33(5), 1113 (in Chinese). 朱平华, 刘文英.武汉理工大学学报(材料学版), 2018, 33(5), 1113 11 Zhu P, Zhang X, Wu J, et al.Journal of Wuhan University of Technology-Mater, 2016, 31(5), 989 (in Chinese). 朱平华, Zhang X, 伍君勇, 等.武汉理工大学学报(材料学版), 2016, 31(5), 989. 12 Belabbas O, Bouziadi F, Boulekbache B, et al.Journal of Building Engineering, 2024, 89, 109333. 13 Faury J, Caquot A.Le béton, third ed, Dunod, Paris, France, 1958. 14 Fei D, Yan Y, Liangcai C, et al.Mathematical Problems in Engineering, 2017, 2017(1), 2050285. 15 Abreu V, Evangelista L, De Brito J.Construction and Building Materials, 2018, 188, 480. 16 Sun B, Mao S, Wang J, et al.Building Structure, 2019, 49(9), 111 (in Chinese). 孙彬, 毛诗洋, 王景贤, 等.建筑结构, 2019, 49(9), 111. 17 Li X, Fu Z, Wang H.Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(2), 169 (in Chinese). 李雪峰, 付智, 王华牢.农业工程学报, 2018, 34(2), 169. 18 Sultana A, Roknuzzaman M, Civil Engineering Beyond Limits, 2021, 1, 12. 19 Casuccio M, Torrijos M C, Giaccio G, et al.Construction and Building Materials, 2008, 22(7), 1500. 20 Pedro D, De Brito J, Evangelista L.Construction and Building Materials, 2017, 154, 294. 21 Zhu X, Zhang Y, Chen L, et al.Cement and Concrete Composites, 2023, 139, 105004. 22 Gao S, Guo J, Zhu Y, et al.Construction and Building Materials, 2023, 408, 133592. 23 Wang Y, Zhang W, Wang J, et al.Cement and Concrete Composites, 2024, 154, 105777. 24 Thomas C, De Brito J, Gil V, et al.Construction and Building Materials, 2018, 166, 171. 25 Mandolia R, Kalla P, Nagar R, et al.Materials Letters, 2025, 381, 137779.
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2026, Vol. 40 
