To assess the effect of photostabilizers on the anti-light aging performance of warm mix asphalt for high altitude and strong ultraviolet regions,three kinds of photostabilizers(Tinuvin770,UV-326,TiO2)were selected to prepare warm mix and anti-light aging modified asphalt binders,and they were subjected to three fundament indexes test,Brookfield viscosity test,low-temperature bending creep test,and time-sweep fatigue test.The results show that three kinds of photostabilizers exhibited a excellent improvement on the anti-light aging performance of warm mix asphalt,TiO2 has the best improvement performance.Af-ter ultraviolet aging,the viscosity aging index VAI and critical cracking temperature Tc of warm mix as-phalt were inversely proportional to the dosage of photostabilizer,and the fatigue life of modified asphalt reached up to 2 300 times.The recommended dosages of photostabilizers T770,UV326 and nano TiO2 are 0.7%,0.7%and 3%,respectively.
关键词
高海拔地区/强紫外线/温拌沥青/光稳定剂/抗光老化性能
Key words
high altitude areas/strong ultraviolet radiation/warm mix asphalt/photostabilizer/anti-light aging performance
万方数据