沥青再生过程中界面新旧沥青混溶成效对混合料疲劳性能的影响

Influence of Mixing Effect of Old and New Asphalts at Interface on Fatigue Properties of Mixture during Asphalt Regeneration

为研究相同级配、不同拌和因素下再生沥青混合料界面新旧沥青混溶成效对混合料疲劳性能的影响,基于红外光谱法将再生过程中新旧沥青“部分混溶”的定性问题转向定量,建立了再生沥青混合料混溶成效量化评价方案,研究了不同RAP掺量、拌和温度和干拌时间因素下界面新旧沥青混溶成效与再生料疲劳寿命的联系,进而优选了拌和方案。结果显示:不同拌和因素下,混合料疲劳性能随着界面新旧沥青混溶成效变化而变化,优选拌和方案为40%RAP掺量、165℃拌和温度和90 s干拌时间。

In order to study the influence of mixing effect of old and new asphalts at the interface of recycled asphalt mixture on the fatigue properties of mixture under same grading and different mixing factors,and based on the infrared spectroscopy,the qualitative problem of"partial mixing"of new and old asphalt during the regeneration process is turned to quantitative problem,and a quantitative evaluation scheme of the mixing effect of recycled asphalt mixture is established,and the relationship between the mixing effect of the new and old asphalts at the interface and the fatigue life of the recycled materials under the factors of different RAP content,mixing temperature and dry mixing time is studied,and then the mixing scheme is optimized.The results show that under the different mixing factors,the fatigue performance of the mixture changes with the mixing effect change of new and old asphalts at the interface.The best mixing scheme is 40%RAP content,165℃mixing temperature and 90 s dry mixing time.