Improvement of photostabilizer on light-ageing resistance of warm mix asphalt for using in high altitude areas
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.
high altitude areasstrong ultraviolet radiationwarm mix asphaltphotostabilizeranti-light aging performance
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