Study on the Relationship between the Performance of Cold Reclaimed Asphalt Mixture with Alkali Active Filler and the Content of Waste Asphalt Aggregate

本文围绕碱活性填料冷再生沥青混合料性能与废沥青骨料掺量的关系展开。实验设置废沥青骨料掺量为0%~100%，固定其他材料用量，测试混合料多种性能。结果显示，随着废沥青骨料掺量增加，混合料力学性能下降，抗压强度和劈裂强度降幅明显。路用性能方面，高温稳定性先升后降(40%掺量时动稳定度最大为3200次/mm)，低温抗裂性和水稳定性逐渐变差，低温弯曲应变降低，残留稳定度和冻融劈裂抗拉强度比下降。经线性回归分析，各性能指标与掺量线性关系显著(R2均超0.94)，且呈负相关。研究成果为冷再生沥青混合料的工程应用提供科学依据，推动道路工程可持续发展。This paper focuses on the relationship between the performance of cold reclaimed asphalt mixture with alkali active filler and the content of waste asphalt aggregate. The experiment set the content of waste asphalt aggregate to 0%~100%, fixed the amount of other materials, and tested various properties of the mixture. The results showed that with the increase of waste asphalt aggregate content, the mechanical properties of the mixture decreased, and the compressive strength and splitting strength decreased significantly. In terms of road performance, the high temperature stability increases first and then decreases (the maximum dynamic stability is 3200 times/mm when the content is 40%), the low temperature cracking resistance and water stability gradually deteriorate, the low temperature bending strain decreases, the residual stability and the tensile strength ratio of freeze-thaw splitting decrease. Through linear regression analysis, the linear relationship between each performance index and the content is significant (R² is over 0.94), and the correlation is negative. The research results provide scientific basis for the engineering application of cold recycled asphalt mixture and promote the sustainable development of road engineering.