山东理工大学学报（自然科学版）

回收建筑垃圾作为再生集料以生产混凝土是建筑拆除废弃物资源化再利用的有效手段。本文设计了21组不同配比的建筑垃圾再生混凝土(WRC),分析了建筑垃圾总掺量(0%、25%、50%、75%、100%)、建筑垃圾中RCA∶RBA比例(0∶100、25∶75、50∶50、75∶25、100∶0)在不同应力水平下对WRC疲劳寿命的影响，进而建立了能够同时考虑建筑垃圾掺量、RCA∶RBA比例、应力水平的WRC统一疲劳寿命预测方程。结果表明：WRC疲劳寿命随着建筑垃圾总掺量的增加而降低，但降低趋势逐渐减弱，该规律随着应力水平的降低而愈加显著；WRC疲劳寿命随着建筑垃圾中RCA比例的提升而近似线性增加，且随着建筑垃圾总掺量和应力水平的增加而愈加明显；提出的疲劳预测方程可同时表征RCA掺量、RBA掺量、RCA∶RBA比例、应力水平等因素对疲劳寿命的影响，且具有较好的预测精度。

Recycled concrete from construction waste(WRC) is an effective method for resource utilization of demolition waste. This study investigates the combined effects of recycled concrete aggregate(RCA) and recycled brick aggregate(RBA) on fatigue life of WRC. 21 sets of WRCs were designed to analyze the effects of the total waste content(0%, 25%, 50%, 75%, 100%) and proportion(0∶100, 25∶75, 50∶50, 75∶25, 100∶0) of RCA and RBA on fatigue life of WRC under various stress levels. A unified WRC fatigue life prediction equation was developed, taking into account construction waste content, proportion, and stress level simultaneously. Results show that the fatigue life of the WRC decreases as the total content of construction waste increases, however, this decreasing trend gradually weakens and becomes more pronounced at lower stress levels. Simultaneously, the fatigue life of the WRC increases almost linearly with the rising proportion of the RCA in the construction waste. This effect becomes more evident with an increase in both the total content of construction waste and the stress level. The proposed fatigue prediction equation effectively characterizes the influences of ceramic waste size, content, and stress level on the fatigue life of lightweight aggregate concrete, demonstrating satisfactory prediction accuracy.