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

Research on High and Low Temperature Rheological Properties and Thermal and Oxygen Aging Resistance of Basalt Fiber/APAO Composite Modified Asphalt

为了避免或减少沥青病害出现,选取玄武岩纤维和APAO作为沥青的改性剂,成功制备了高低温流变性能以及抗热氧老化性能具佳的玄武岩纤维/APAO复合改性沥青。通过DSR以及BBR试验,研究APAO改性沥青和玄武岩纤维/APAO复合改性沥青的高低温流变性能和抗热氧老化性能,并通过高低温连续分级温度,确定玄武岩纤维和APAO的最佳掺量;通过红外光谱分析其老化机理。结果表明:APAO可明显改善沥青的高温流变性能和抗热氧老化性能;但是APAO也明显损害了沥青的低温流变性能;而玄武岩纤维对于沥青的低温流变性能和抗低温热氧老化性能改善作用明显。玄武岩纤维的最佳推荐掺量为2%,APAO的最佳掺量推荐为2%,在此掺量下沥青各项性能良好,高低温流变性能和抗热氧老化性能兼备。通过红外光谱分析可知:玄武岩纤维对于沥青是物理改性;APAO与沥青中的组分相结合,增强了沥青相关吸收峰强度;玄武岩纤维在沥青热氧老化过程中可以抑制羰基和亚砜基官能团的生成,抗热氧老化性能比APAO更好。

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.