沥青结合料对沥青碎石路面性能的影响

Effect of Asphalt Binder on Pavement Performance of Asphalt Macadam

为了分析沥青结合料对沥青碎石路面性能的影响，采用车辙试验、冻融劈裂试验和弯曲试验的方法，研究沥青膜厚度、沥青类型和粉胶比对沥青碎石路面性能的影响。发现沥青膜厚度、沥青类型和粉胶比对沥青碎石路面性能影响显著；随着沥青膜厚度的减小，沥青碎石马歇尔稳定度先增大后减小，高温稳定性提高，水稳定性与低温抗裂性降低；SBS改性沥青较基质沥青的路面性能较好；随着粉胶比的增大，马歇尔稳定度和低温抗裂性先增大后减小，高温稳定性和水稳定性提高。结果表明：沥青膜厚度为9～11μm时，沥青碎石的综合路面性能较好；SBS改性沥青可有效提高沥青碎石的路面性能；粉胶比为0．8～1．2时，沥青碎石的综合路面性能较好；高温地区宜采用SBS改性沥青和低标号沥青，且沥青膜厚度宜为9μm，粉胶比宜为1．0～1．2；寒冷地区宜采用SBS改性沥青和高标号沥青，且沥青膜厚度宜为11μm，粉胶比宜为0．8～1．0。

In order to analyze the effect of asphalt binder on pavement performance of asphalt macadam, the influences of asphalt film thickness, asphalt type and ratio of filler to bitumen on pavement performance of asphalt macadam are studied based on the method of rutting test, freeze-thaw split test and bending test. It is found that （ 1 ） asphalt film thickness, asphalt type and ratio of filler to bitumen have a significant impact on the pavement performance of asphalt macadam; （2） as the asphalt film thickness decreasing, the Marshall stability of asphalt macadam first increases and then decreases, the high-temperature stability increases, and the water stability and low-temperature crack resistance reduce; （3） the pavement performance of SBS modified asphalt is better than that of matrix asphalt, as the ratio of filler to bitumen increases, the Marshall stability and low-temperature crack resistance first increase and then decrease, the high-temperature stability and water stability increase. The result shows that （ 1 ） when asphalt film thickness is 9 - 11 μm, asphalt macadam has a good comprehensive performance; （2） SBS modified asphalt can effectively improve pavement performance of asphalt macadam ; （ 3 ） when the ratio of filler to bitumen is 0. 8 - 1.2, asphalt macadam has a good comprehensive pavement performance; （4） SBS modified asphalt and low grade asphalt should be adopted in high temperature area, the asphalt film thickness should be 9 μm and the ratio of filler to bitumen should be 1.0 - 1.2 ;： （5） SBS modified asphalt and high grade asphalt should be adopted in low temperature area, the asphalt film thickness should be 11 μm and the ratio of filler to bitumen should be 0.8-1.0.