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以埃索70号沥青作为基质沥青,以不同掺量的TLA制备改性沥青,采用动态剪切流变仪和低温弯曲梁流变仪对TLA改性沥青的流变性进行分析,制备AC-13C型TLA改性沥青混合料,并对其路用性能进行研究。试验结果表明:TLA能改善沥青结合料的高温稳定性,车辙因子和黏度均随着TLA掺量的增加而不断增加,在提高沥青结合料的高温稳定性的同时,其低温性能也有所降低;随着TLA掺量的增加,S值变大而m值减小,TLA改性沥青胶浆的S值与TLA掺量的关系可采用指数函数回归模型来表示,而m值随TLA掺量增加呈线性减小;基质沥青经TLA改性后,其高温稳定性、水稳定性和疲劳性能得到明显改善,TLA改性沥青混合料具有优良的路用性能。
Rheological properties of TLA modified asphalt were analyzed by using dynamic shearing rheometer and low temperature bending beam rheometer with Esso 70 asphalt as matrix pitch and TLA modified asphalt with different dosage. AC-13C TLA modified asphalt mixture, and its road performance study. The results show that TLA can improve the high temperature stability of asphalt binder. The rutting factor and viscosity increase with the increase of TLA content. While improving the high temperature stability of asphalt binder, the low temperature performance of asphalt binder is also reduced. With the increase of the amount of TLA, the value of S increases and the value of m decreases. The relationship between the value of S and the amount of TLA in TLA modified asphalt mortar can be expressed by exponential regression model, while the value of m increases with the amount of TLA The linearity of matrix asphalt decreased with TLA modification. The high temperature stability, water stability and fatigue properties of matrix asphalt were significantly improved. The TLA modified asphalt mixture has excellent road performance.