不同种类再生剂对再生沥青的性能影响研究

Study on Influence of Different Reclaiming Agents on Performance of Recycled Asphalt

摘要:

以海南省G98环岛高速公路养护与维修工程为背景，秉持低碳环保、绿色发展为目标。为养护与维修工程中产生的公废旧沥青这次高效回收利用提供一些浅薄的建议及试验数据。选择3种不同类型的再生剂分别为：以植物油为基础的；以石油馏分制成的及合成型再生剂，以4种不同掺量（5%、7%、9%、11%）掺入老化沥青中，制备3种分别为A、B、C的再生沥青，并进行性能试验。试验结果显示，3种再生剂的最佳掺量都为7%，在相同掺量的情况下，C再生剂的针入度、软化点、延度与新沥青性能指标最为接近；BBR试验结果显示，C再生沥青相比其他两种再生沥青，劲度模量增长趋势和蠕变速率下降趋势都是最为缓慢的，说明其具有更好的低温性能和低温抗裂性。综合以上试验结果，合成型再生剂为最佳再生剂，最佳掺量为7%。

Abstract:

Taking the Hainan G98 Roundabout Expressway Maintenance and Repair Project as the background, with the goal of low-carbon environmental protection and green development, some superficial suggestions and experimental data are proposed for the efficient recycling and utilization of public waste asphalt generated in the maintenance and repair projects. Three different types of reclaiming agent are selected that are made of vegetable oil, petroleum fractions and synthetic form. Four kinds of different dosages (5%, 7%, 9% and 11%) are mixed into the aged asphalt to prepare three types of recycled asphalts A, B and C respectively, and the performance tests are carried out. The experimental results show that the optimal dosage of the three reclaiming agents is 7%. Under the same dosage, the penetration, softening point and ductility of C reclaiming agent are the closest to the performance indicators of new asphalt. The BBR experimental result shows that compared with the other two recycled asphalts, the stiffness modulus growth trend and creep rate decline trend of C recycled asphalt are the slowest, which explains that it has the better low-temperature performance and low-temperature crack resistance. Based on the above experimental results, the synthetic reclaiming agent in this study is the best one and its optimal dosage is 7%.