玄武岩纤维/APAO复合改性沥青高低温流变性能和抗热氧老化性能研究OACSTPCD

In order to avoid or reduce the occurrence of asphalt disease,basalt fiber and APAO were selected as modifiers of asphalt,and basalt fiber/APAO composite modified asphalt with good high and low temperature rheological properties and anti-heat and oxygen aging properties was successfully prepared.Through the DSR and BBR tests,the high and low temperature rheological properties and anti-heat and oxygen aging properties of APAO-modified asphalt and basalt fiber/APAO composite modified asphalt were investigated,and the optimal dosage of basalt fibers and APAO was determined through the successive graded temperatures at high and low temperatures;and the aging mechanism was analyzed by infrared spectroscopy.The results show that APAO can significantly improve the high-temperature rheological properties and resistance to thermal and oxygen aging of asphalt;however,APAO also significantly impaired the low-temperature rheological properties of asphalt;and the basalt fiber can improve obviously the low temperature rheological properties and the resistance to low temperature thermal and oxygen aging of asphalt.The best recommended dosage of basalt fiber is 2％,and the best recommended dosage of APAO is 2％,under this dosage,the asphalt has good high and low temperature rheological properties and resistance to thermal and oxygen aging.Through infrared spectroscopy analysis,it can be seen that:basalt fiber for asphalt is a physical modification;the combination of APAO and asphalt components,can enhance the intensity of the relevant absorption peaks in the asphalt;basalt fibers in the process of asphalt thermo-oxidative aging can inhibit the generation of carbonyl and sulfoxide functional groups,the thermal oxygen aging resistance is better than that of APAO.