耐久性复合改性沥青混合料的路用性能

屈会朋

华设（江苏）新材料科技有限公司，江苏 南京  211100

摘要：为提高公路沥青路面的耐久性，将A（聚乙烯复合材料）、B（高分子复合材料）、C（橡塑合金材料）和D（聚合物复合材料）4种复合改性剂分别掺入AC-13沥青混合料制备符合改性沥青混合料，对比抗车辙性能，优选性能均衡的复合改性剂C。将复合改性剂C掺入高性能级配沥青混合料SUP-20制备复合改性沥青混合料，以苯乙烯-丁二烯嵌段共聚物（styrene-butadiene triblock copolymer，SBS）改性沥青混合料SUP-20为对照试样，分别进行高温抗车辙性能试验、抗水损害性能试验、低温性能试验等。试验结果表明：复合改性后的C-70#基质沥青SUP-20混合料的平均动稳定度增大11.0%，劈裂强度比增大1.7%，抗弯拉强度增大8.6%，抗低温破坏性能增大14.9%，在温度5、20、35 ℃和频率0.1、1、10 Hz下的动态模量都高于SBS改性沥青SUP-20混合料，相位角都小于SBS改性沥青SUP-20混合料。

关键词：复合改性；路用性能；耐久性；高温稳定性；低温性能；抗水损坏性能

Pavement performance of durable composite modified asphalt mixture

QU Huipeng

China Design Group (Jiangsu) New Materials Technology Co., Ltd., Nanjing 211100, China

Abstract: To improve the durability of asphalt pavement, composite modifier C with balanced performance is selected from four types of composite modifiers A (polyethylene composite material), B (polymer composite material), C (rubber-plastic alloy material), and D (polymer composite material) to prepare modified asphalt mixtures compliant by mixing it with high-performance graded asphalt mixture SUP-20. Styrene-butadiene triblock copolymer (SBS) modified asphalt mixture SUP-20 is used as the control sample for conducting high-temperature anti-rutting performance tests, anti-water damage performance tests, low-temperature performance tests, etc. The test results show that the average dynamic stability, the splitting strength ratio, the flexural tensile strength, and the resistance to low-temperature damage of the C-70# matrix asphalt SUP-20 mixture after composite modification increases by 11.0%, 1.7%, 8.6%, and 14.9%, respectively. The dynamic modulus at temperatures of 5, 20, 35 °C and frequencies of 0.1, 1, 10 Hz are all greater than that of the SBS-modified asphalt mixture SUP-20, with phase angles less than that of the SBS-modified asphalt mixture SUP-20.

Keywords: composite modification; pavement performance; durability; high temperature stability; low temperature performance; water resistance performance