纳米TiO_(2)/TLA复合改性沥青及混合料性能研究

Study on the Properties of Nano-TiO_(2)/TLA Composite Modified Asphalt and Mixture

为研究纳米TiO_(2)、TLA对SBS改性沥青及其混合料性能的影响,确定最优组合方案,通过针入度、软化点、延度、黏度、剪切流变及弯曲流变等试验,研究复合改性沥青的常规性能及高低温流变性能,并对复合改性沥青混合料的路用性能进行评价分析。结果表明:TLA或纳米TiO_(2)掺入后会降低SBS改性沥青针入度和延度,提高软化点和黏度,其中TLA影响较大,且TLA掺量不宜大于25%;纳米TiO_(2)可提高沥青胶结料的高温抗剪切变形能力,但同时降低沥青胶结料低温流变性能,其掺量不宜超过2%;TLA和纳米TiO_(2)在提高沥青混合料抗高温车辙能力和抗水损害性能方面效果显著,但同时TLA会明显降低其低温性能,纳米TiO_(2)影响很小。考虑综合性能推荐2%纳米TiO_(2)、25%的TLA的组合为最优方案。

In order to study the effect of nano-TiO_(2) and TLA on the performance of SBS modified asphalt and its mixture,and determine the optimal combination scheme,the conventional performance and high and low temperature rheological properties of composite modified asphalt were studied by using penetration,softening point,ductility,viscosity,shear rheology and bending rheology tests,and the road performance of composite modified asphalt mixture was evaluated and analyzed.The results show that the incorporation of TLA or nano-TiO_(2) will reduce the penetration and ductility of SBS modified asphalt,and increase the softening point and viscosity.Among them,TLA has a great influence,and the content of TLA should not be more than 25%.Nano-TiO_(2) can improve the high temperature shear deformation resistance of asphalt binder,but at the same time reduce the low temperature rheological properties of asphalt binder,and its content should not exceed 2%.TLA and nano-TiO_(2) have significant effects on improving the high temperature rutting resistance and water damage resistance of asphalt mixture,but at the same time,TLA will significantly reduce its low temperature performance,and nano-TiO_(2) has little effect.Considering the comprehensive performance,the combination of 2%nano-TiO_(2) and 25%TLA is recommended as the optimal solution.