改性沥青分散性与抗老化性能

针对TiO2改性沥青应用中的基本问题进行研究,通过室内扫描电子显微镜分析了TiO2在沥青中的分散稳定性;通过室内沥青常规试验,分析了TiO2改性沥青的基本性能包括软化点、针入度和延度的变化规律;通过薄膜烘箱老化和紫外线老化试验分别研究了TiO2对沥青的老化性能的影响规律.研究结果表明,高速剪切设备辅以分散剂可以在沥青中有效分散沥青;当TiO2掺入质量分数为4%时,改性沥青的基本性能变化很小,并且具有最佳的抗老化性能.

Dispersion and Re aging Properties of Asphalt Modified with TiO2

Aiming at fundamental issues in the application of titanium dioxide on modified asphalt including dispersion and re aging performance effect on asphalt,an analysis was made of the dispersion stability of titanium dioxide in asphalt with scanning electron microscope and also the effect of titanium dioxide on the performance of asphalt by some lab tests including softening point, penetration and ductility tests.A research was then made into the effect on the re aging performance of modified asphalt by TFOT and ultraviolet radiation aging test. The results show that titanium dioxide can be effectively dispersed in the asphalt under high speed shearing force and adding some dispersing agent can improve the dispersion ability; when the titanium dioxide content is 4%, the road performance of modified asphalt changes little, and the modified asphalt is of the best anti aging performance.