无车辙路面在道路交叉口的应用

吕健涵，吕奉丽^*，刘芝敏，耿磊

济南金曰公路工程有限公司，山东 济南  250101

摘要：为解决G104京岚线青银高速靳家立交至山东高速交界段K428+300—K428+550道路交叉口车辙病害频发的问题，在修复养护施工中采用无车辙路面（no-rutting pavement，NRP）技术，采用无车辙剂和改性苯乙烯-丁二烯-苯乙烯嵌段共聚物（styrene butadiene styrene，SBS）沥青，设计路面结构为厚4 cm重交通抗车辙改性沥青玛蹄脂碎石混合料SMA-13与厚6 cm重交通抗车辙改性沥青混凝土AC-20（无车辙改性剂在沥青混合料中的质量分数为1%）改善路面车辙情况。采用室内试验的方法，得到SMA-13与AC-20的最佳沥青质量分数分别为5.9 %、4.3 %。实际铺筑完成运营0.5 a后检测路面的弯沉、构造深度及车辙深度。结果显示：通车运营0.5 a后，实际弯沉较设计弯沉减小约36%，路面承载能力得到较大幅度的提高；构造深度均大于0.5 mm，抗滑性能优异；无车辙路面表面平整，车辙深度小于4.00 mm，远小于标准车辙深度。

关键词：NRP；无车辙剂；车辙深度；构造深度；沥青路面

Application of no-rutting pavement at road intersections

LÜ Jianhan, LÜ Fengli^*, LIU Zhimin, GENG Lei

Jinan Kingyue Highway Engineering Co., Ltd., Jinan 250101, China

Abstract: To address the problem of frequent rutting damage at the intersection of the Qingdao-Yinchuan Expressway at the Jinjia Interchange to the Shandong Expressway junction from station K428+300 to K428+550 on G104, a no-rutting pavement (NRP) technology is used in the repair and maintenance construction, utilizing no-rutting agents and modified styrene-butadiene-styrene (SBS) block copolymers. The designed pavement structure consists of a 4 cm heavy traffic anti-rutting modified asphalt Ma Gaiti crushed stone mixture SMA-13, and a 6 cm heavy traffic anti-rutting modified asphalt concrete AC-20 (with NRP accounting for 1% of the mass fraction in the asphalt mixture) to improve the rutting situation. Through indoor testing, the optimum asphalt content are determined to be 5.9% for SMA-13 and 4.3% for AC-20. After actual construction and half a year of operation, the pavement′s rutting depth, construction depth, and rutting depth are inspected. Results show that after 0.5 a of operation, the actual rutting depth decreases by approximately 36% compared to the design rutting depth, indicating a significant improvement in the road′s bearing capacity. The construction depth exceeds 0.5 mm, showing excellent skid resistance performance. The no-rutting pavement surface is smooth, and the rutting depth is less than 4.00 mm, significantly lower than the standard rutting depth.

Keywords: NRP; no-rutting agent; rut depth; structural depth; asphalt pavement