钢桥面铺装体系材料选型与设计

Material Selection and Design of Steel Deck Pavement System

结合铺装材料的配合比设计和性能试验,研究分析了典型铺装材料的高温稳定性能、抗疲劳开裂性能和黏结层应用性能。结果表明:环氧沥青混合料EA表现出较好的抗车辙特性,其60℃最终车辙深度为沥青玛蹄脂碎石混合料SMA的30%左右,70℃最终车辙深度仅为SMA的25%左右;对于SMA,在铺装设计时需要考虑一个临界应变水平,并在结构设计时宜控制其实际应变水平低于该临界值;存在最佳黏结材料用量使层间黏结强度达到最大,且拉拔试验和斜剪试验得到的最佳用量一致,2种试验结果具有一致性。

Combined with the mix design and performance test of pavement materials,the high temperature stability,fatigue cracking performance and the bonding layer application of the typical pavement materials are studied and analyzed.The result shows that the epoxy asphalt mixture EA has the better anti-rut features.Its 60℃final rut depth is about 30%of asphalt mastic macadam mixture.The 70℃final rut depth is only about 25%of SMA.For SMA,a critical strain level should be considered during the design of pavement.Its practical strain level is properly controlled lower than this critical value during the structural design.The optimum bonding material dosage makes the bonding strength among layers maximum.The optimum dosages of the pull-out test and the oblique shear test are same,and two testing results are same.