基于旋转压实的冷拌再生沥青混合料设计方法研究

Research on Mix Proportion Design and Evaluation Index of Cold Recycled Asphalt Mixture Based on Rotary Compaction Method

摘要: 为进一步完善冷拌再生混合料配合比设计方法及性能评价指标，本研究基于旋转压实法进行混合料配合比设计，确定以旋转压实100次作为冷拌再生混合料的标准压实功，基于初始强度和扫刷质量损失确定冷拌再生混合料最佳沥青用量为1.7%。成型温度对混合料空隙率影响显著，压实次数超过100次后，温度越高混合料空隙率对压实次数越不敏感，确定以60℃旋转压实100次模拟混合料的最终密实状态。冷拌再生混合料初始动稳定度低、空隙率大，易发生压密型车辙和水损病害，随稀释剂的挥发及密实度的提高，后期具有良好的高温稳定性。

Abstract: In order to further improve the mix design method and performance evaluation indicators of cold mix recycled mixtures, this study is based on the rotary compaction method for mix design. The standard compaction work of cold mix recycled mixtures is determined to be 100 times of rotary compaction. Based on the initial strength and sweep quality loss, the optimal asphalt content of cold mix recycled mixtures is determined to be 1.7%. The molding temperature has a significant impact on the porosity of the mixture. After more than 100 compaction cycles, the higher the temperature, the less sensitive the porosity of the mixture is to the compaction cycles. It is determined to simulate the final compacted state of the mixture by rotating and compacting it at 60˚C for 100 cycles. Cold mixed recycled mixtures have low initial dynamic stability, high porosity, and are prone to compaction type rutting and water damage. With the evaporation of diluents and the increase of compactness, they have good high-temperature stability in the later stage.