基于混合度（DOB）的高RAP掺量热再生沥青混合料低温疲劳性能研究,Polymers

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基于混合度（DOB）的高RAP掺量热再生沥青混合料低温疲劳性能研究
Polymers ( IF 4.7 ) Pub Date : 2022-10-25 , DOI: 10.3390/polym14214520
Jianming Wu ₁ , Hao Sun ₁ , Lixia Wan ₁ , Jiangang Yang ₂ , Shuyi Wang ₂

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本文选取了三种高RAP含量（30%、40%、50%）的AC-20热拌再生沥青混合料。它通过改变RAP预热温度和混炼温度，得到不同混溶度的混合物。提出了RAP沥青界面再生混合度(DOB)的计算公式。DSR试验定量表征了DOB混合料的低温，并通过梁弯曲试验和四点弯曲疲劳试验测试了疲劳性能。提出了再生混合料低温和疲劳性能的预测模型。RAP 预热温度是决定 RAP 沥青向新骨料表面转移和新旧沥青有效混合的最关键因素。DOB对低温性能和疲劳性能有显着的影响。通过调整优化厂用热再生混合料的工艺参数，可以提高再生沥青的DOB，有效提高再生混合料的低温抗裂性和疲劳寿命。可以根据预测模型获得所需性能的最佳RAP用量和混合工艺，以节省实验时间和成本。

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Study on Low-Temperature and Fatigue Performance of High RAP Content Hot Recycled Asphalt Mixture Based on the Degree of Blending (DOB)

This paper selected three kinds of AC-20 hot-mix recycled asphalt mixtures with high RAP content (30%, 40%, and 50%). It obtains a mixture of different degrees of miscibility by changing RAP preheating temperatures and mixing temperatures. The calculation formula of the degree of blending (DOB) of RAP asphalt interface recycling is proposed. The DSR test quantitatively characterized the DOB mixture’s low temperature, and fatigue properties were tested by beam bending test and four-point bending fatigue test. The prediction models of the recycled mixture’s low temperature and fatigue properties were proposed. The RAP preheating temperature is the most critical factor that dominates both transfers of RAP asphalt to the surface of new aggregate and the effective blending of old and new asphalt. DOB has a significant great influence on low-temperature performance and fatigue performance. The DOB of recycled asphalt can be improved by adjusting and optimizing the process parameters of plant hot recycled mixture to effectively improve the recycled mixture’s low-temperature crack resistance and fatigue lifetime. The optimal RAP dosage and mixing process of required performance can be obtained based on the prediction models to save experimental time and cost.

更新日期：2022-10-25

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