土工格栅对砂粒式沥青混合料路用性能的影响

高雪池¹，张晓萌^2*，薛志超³，吴文娟²，马士杰²，徐希忠²，李洪利⁴

1.山东高速集团有限公司，山东 济南  250101；2.山东省交通科学研究院，山东 济南  250102；

3.山东高速基础设施建设有限公司，山东 济南  250101；4.山东高速集团有限公司智慧管理中心，山东 济南  250013

摘要：为研究土工格栅对砂粒式沥青混合料路用性能的影响，分别采用碳纤维格栅、玻璃纤维格栅、经编玻璃纤维格栅、聚丙烯格栅等4种土工格栅加筋砂粒式沥青混合料，进行沥青混合料裂缝扩展性能试验、三点弯曲试验、高温车辙试验和四点弯曲疲劳试验，分析铺设土工格栅前、后砂粒式沥青混合料的路用性能。结果表明：加入玻璃纤维格栅和经编玻璃纤维格栅可显著提升沥青混合料性能的抗拉、抗弯拉、抗车辙及抗疲劳性能；碳纤维格栅在抗拉和抗弯拉和抗车辙性能提升中效果最佳，但在疲劳性能提升方面最弱；聚丙烯纤维格栅的改善效果不如其他3种格栅突出。

关键词：土工格栅；砂粒式沥青混合料；抗裂性能；抗车辙性能；抗疲劳性能

Influence of geogrid on the road performance of sand-grained asphalt mixture

GAO Xuechi¹, ZHANG Xiaomeng^2*, XUE Zhichao³, WU Wenjuan²,

MA Shijie², XU Xizhong², LI Hongli⁴

1.Shandong Hi-speed Group Co., Ltd., Jinan 250101, China; 2. Shandong Transportation Institute, Jinan 250102, China; 

3. Shandong Hi-speed Group Innovation Research Institute, Jinan 250101, China;

4. Shandong Hi-speed Group Intelligent Management Center, Jinan 250013, China

Abstract: To study the influence of geogrids on the performance of sand-grained asphalt mixture for pavement, four types of geogrids, including carbon fiber geogrid, glass fiber geogrid, stitched glass fiber geogrid, and polypropylene geogrid, are used to reinforce the sand-asphalt mixture. Tests are conducted on the asphalt mixture for crack propagation, three-point bending, high-temperature rutting, and four-point bending fatigue. The road performance of the sand-asphalt mixture before and after laying geogrids is analyzed. The results show that incorporating glass fiber geogrid and stitched glass fiber geogrid significantly improves the tensile, flexural, rutting, and fatigue resistance of the asphalt mixture. The carbon fiber geogrid performs best in enhancing tensile, flexural, and rut resistance, but is the weakest in improving fatigue performance. The improvement effect of polypropylene geogrid is not as significant as the other three types of geogrids.

Keywords: geogrid; sand-grained asphalt mixture; tensile resistance; rut resistance; fatigue resistance