Wu Bangwei, Luo Chufan, Pei Zhaohui, Chen Chuangchuang, Xia Ji, Xiao Peng
College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Research Center for Basalt Fiber Composite Construction Materials, Yangzhou University, Yangzhou 225127, China.
Materials (Basel). 2021 Sep 30;14(19):5715. doi: 10.3390/ma14195715.
A wide variety of polymer additives have been widely used in recent years. However, the effect of different polymer additives on the durability of asphalt binders has not been investigated thoroughly. To evaluate the aging property of styrene-butadiene-styrene (SBS) asphalt binder with different polymer additives, three polymer modifiers, namely high modulus modifier (HMM), anti-rutting agent (ARA), and high viscosity modifier (HVM), were added to it. First, the Thin Film Over Test (TFOT) and Pressure Aging Vessel (PAV) was performed on the asphalt binders. The rheological properties of the four asphalt binders before and after aging were then checked by the Dynamic Shear Rheometer Test (DSR). The chemical compositions of the asphalt binders were determined by the Fourier Transform Infrared Spectrometer (FTIR) test. Several aging indicators were adopted to reflect the aging degree of the asphalt binders. The results show that when polymer additives are added to the SBS asphalt binder, the complex modulus, storage modulus, loss modulus, and rutting factor substantially increase and the phase angle decreases. All the test parameters become higher after aging. The phase angle of the SBS asphalt binder is the highest at both unaged and aged states, while its other parameters values are the smallest. Moreover, the Carbonyl Aging Indicator (CAI) of SBS with polymer additives becomes lower under both TFOT and PAV conditions, indicating that polymer additives can improve the aging resistance of SBS asphalt, of which HVM modifies the aging resistance best. Complex Modulus Aging Indicator (CMAI) and Storage Modulus Aging Indicator (SMAI) have the best correlation coefficients with CAI, and the two aging indicators can be used to predict the aging degree of polymer modified asphalt binders.
近年来，各种各样的聚合物添加剂已被广泛使用。然而，不同聚合物添加剂对沥青结合料耐久性的影响尚未得到充分研究。为了评估添加不同聚合物添加剂的苯乙烯 - 丁二烯 - 苯乙烯（SBS）沥青结合料的老化性能，向其中添加了三种聚合物改性剂，即高模量改性剂（HMM）、抗车辙剂（ARA）和高粘度改性剂（HVM）。首先，对沥青结合料进行薄膜烘箱试验（TFOT）和压力老化容器试验（PAV）。然后通过动态剪切流变仪试验（DSR）检查四种沥青结合料老化前后的流变性能。通过傅里叶变换红外光谱仪（FTIR）试验确定沥青结合料的化学成分。采用了几个老化指标来反映沥青结合料的老化程度。结果表明，当向SBS沥青结合料中添加聚合物添加剂时，复数模量、储能模量、损耗模量和车辙因子大幅增加，相位角减小。所有试验参数在老化后都变得更高。SBS沥青结合料在未老化和老化状态下的相位角都是最高的，而其其他参数值是最小的。此外，添加聚合物添加剂的SBS在TFOT和PAV条件下的羰基老化指标（CAI）都变低，表明聚合物添加剂可以提高SBS沥青的抗老化性能，其中HVM对老化性能的改善最佳。复数模量老化指标（CMAI）和储能模量老化指标（SMAI）与CAI的相关系数最佳，这两个老化指标可用于预测聚合物改性沥青结合料的老化程度。
