铁尾矿沥青混合料的路用性能

刘圣洁¹，唐亮²，赵硕³，杜宪华⁴，王俊杰⁵，赵之仲^1*，薛军²

1.山东交通学院交通土建工程学院，山东 济南  250357；2.山东省路桥集团有限公司，山东 济南  250014；

3.河南省交通规划设计研究院股份有限公司，河南 郑州  450001；

4.肥城市交通运输局，山东 泰安  271600；5.山东省交通工程监理咨询有限公司，山东 济南  250010

摘要：为减少大量堆放的固废材料铁尾矿对生态环境的影响，以铁尾矿自身集料特性为基础，探索将铁尾矿用作沥青路面骨料的可行性。以玄武岩矿料为对照组，检测铁尾矿物理指标，更换不同粒径的铁尾矿制备试件，进行车辙试验、低温弯曲试验、浸水马歇尔试验及三轮加速磨耗试验评估其路用性能。结果表明：铁尾矿沥青混合料的性能符合沥青路面层的基本要求；与玄武岩沥青混合料相比，掺加粒径为4.75~13.20 mm的铁尾矿沥青混合料路用性能改善最明显，高温动稳定度升高16.55%，低温最大拉应变为玄武岩的1.13倍，浸水残留稳定度降低6.58%，冻融劈裂试验的残留强度比降低8.03%，且抗滑性能始终优于玄武岩，各项路用性能均能满足规范要求。

关键词：路面材料；铁尾矿；沥青混合料；路用性能；配合比

Road performance of iron tailings asphalt mixture

LIU Shengjie¹, TANG Liang², ZHAO Shuo³, DU Xianhua⁴, WANG Junjie⁵, ZHAO Zhizhong^1*, XUE Jun²

1.School of Transportation and Civil Engineering, Shandong Jiaotong University, Jinan 250357, China;

2.Shandong Luqiao Group Co., Ltd., Jinan 250014, China;

3.Henan Communications Planning and Design Institute Co., Ltd., Zhengzhou 450001, China;

4.Feicheng Transpot Bureau, Taian 271600,China; 5.Shandong Traffic Engineering Supervision Consulting Co., Ltd., Jinan 250010, China

Abstract:To reduce the impact of a large amount of solid waste material iron tailings on the ecological environment, based on the aggregate characteristics of iron tailings, the feasibility of using iron tailings as asphalt pavement aggregates on a large scale is explored. Using basalt ore as the control group, the physical indicators of iron tailings are tested, and specimens are prepared by replacing iron tailings with different particle sizes. The road performance is evaluated through rutting tests, low-temperature bending tests, immersion Marshall tests, and three wheel accelerated wear tests. The results show that:The performance of iron tailings asphalt mixture meets the basic requirements of asphalt pavement layer; Compared with basalt asphalt mixture, adding iron tailings asphalt mixture with particle size from 4.75 to 13.20 mm has the most significant improvement in road performance, with a 16.55% increase in high-temperature dynamic stability, 1.18 times that of basalt in the maximum tensile strain at low temperature, a 6.58% decrease in the residual stability after immersion, and a 8.00% decrease in the residual strength ratio during freeze-thaw splitting test. The skid resistance has always been superior to basalt, and all road performance can meet the specification requirement.

Keywords:pavement material; iron tailings; asphalt mixture; road performance; mix ratio