欧洲岩沥青改性沥青结合料使用性能试验研究

为探讨欧洲岩沥青改性沥青结合料使用性能的影响,在25%范围内对不同掺量的岩沥青改性沥青结合料进行实验室试验,并通过试验结果分析了基质沥青和改性沥青结合料的针入度、针入度指数、当量软化点、当量脆点、软化点、延度、黏度、RTFOT老化后的质量损失、残留针入度比和沥青老化指数等技术参数.试验结果与分析表明,随着岩沥青掺量的增加,岩沥青改性沥青结合料的高温性能、感温性能、可使用温度范围和抗老化性能得到明显改善.然而,随着岩沥青掺量的增加,岩沥青改性沥青结合料的低温性能与延度有所下降,有必要通过沥青混合料试验进一步评价岩沥青改性沥青的使用性能,尤其是低温特性.

An Experimental Study on Performance of European Rock Asphalt Modified Asphalt Binder

In order to explore the performance of European rock asphalt modified asphalt binder, laboratory tests on asphalt binder modified by different contents within 25% of the rock asphalt were carried out. On the basis of the test results, the properties of the modified asphalt binder such as penetration, penetration index, equivalent softening point, equivalent fracture point, softening point, ductility, viscosity, mass loss after RTFOT aging, retained penetration, and aging index were presented and analyzed. The test results and analyses indicated that the high-temperature behavior, temperature susceptibility, applicable temperature range, and aging resistance of rock asphalt modified asphalt binder were improved considerably as the rock asphalt content increased. However, the low temperature behavior and ductility of the rock asphalt modified asphalt binder were deteriorated by the increased rock asphalt content. Therefore, additional tests on the asphalt mixture are needed to evaluate the performance of the rock asphalt modified asphalt binder, particularly for low temperature behavior.