抗车辙剂对沥青混合料的性能影响及改性机理研究

Study on Impact of Anti-rut Agent on Performance of Asphalt Mixture and Its Modification Mechanism

摘要:

为研究抗车辙剂对SBS 改性沥青混合料性能的影响，通过车辙试验、浸水马歇尔试验、冻融劈裂试验、肯塔堡飞散试验和沥青三大指标试验对比了两种不同厂家的抗车辙剂。通过傅里叶红外光谱分析(FTIR)和差示扫描量热分析(DSC)对抗车辙剂的增强改性机理进行了进一步地分析。试验结果表明:虽然两种抗车辙剂均能提高沥青混合料的高温稳定性，但增强作用机理不同。通过FTIR 分析发现，抗车辙剂A 与SBS 改性沥青以物理共混为主，抗车辙剂起到加筋填充作用；而抗车辙剂B 与SBS 改性沥青发生了化学反应，导致沥青质含量的增加。DSC 结果显示，抗车辙剂B+SBS 复合改性沥青相比抗车辙剂A+SBS 复合改性沥青、SBS改性沥青热稳定性更差。

Abstract:

In order to study the impact of anti-rut agent on the properties of SBS modified asphalt mixture, two kinds of anti-rutting agents from different manufacturers are compared through the rutting test, immersion Marshall test, freeze-thaw splitting test, Kentburg flying test and asphalt three-indicator test. The reinforcing modification mechanism of anti-rut agent is further analyzed by Fourier Transform Infrared Spectroscopy (FTIR) and differential scanning calorimetry (DSC). The results show that the high-temperature stabilities of asphalt mixture can be improved by the two anti-rut agents, but the reinforcing mechanisms are different. Through FTIR analysis, it is found that the anti-rut agent A and SBS modified asphalt are mainly physical blending and the anti-rut agent plays the reinforcing filling role. The anti-rut agent B is chemically reacted with SBS modified asphalt, which leads to the increase of asphaltene content. DSC results show that the anti-rut agent B+SBS composite modified asphalt has worse thermal stability than the anti-rut agent A+SBS composite modified asphalt and SBS modified asphalt.