极薄磨耗层用于桥面沥青铺装预防性养护的应用研究

Research on Application of Extremely Thin Wearing Course in Preventive Maintenance of Asphalt Pavement on Bridge Deck

极薄磨耗层应用于桥面沥青铺装的预防性养护中,可以极大改善表面功能,并具有节能环保的特点。为了满足桥面沥青铺装预防性养护的实际需求,尝试了对极薄磨耗层用原材料进行性能改善,改善后检测结果表明,掺入专用复配剂的沥青胶结料60℃动力粘度达到高粘高弹沥青的技术要求,自制改性乳化沥青具备较高的固含量和软化点,作为层间粘结材料可以提供优良的抗剪强度。混合料配合比设计中,通过增设6.3mm控制筛孔对级配进行优化,并对混合料性能进行验证。结合极薄磨耗层在台金高速公路桥面沥青铺装预防性养护工程中的应用实例,系统总结了极薄磨耗层施工的质量控制要点,可为高速公路桥面沥青铺装预防性养护提供参考。

The application of extremely thin wearing course in preventive maintenance of asphalt pavement on bridge deck can greatly improve the surface function,with the characteristics of energy saving and environmental protection.In order to meet the actual needs of preventive maintenance of bridge deck asphalt pavement,the performance improvement of raw materials for extremely thin wearing course is tried.The test results after improvement show that the dynamic viscosity of asphalt binder mixed with special compound agent at 60℃reaches the technical requirements of high viscosity and high elasticity asphalt.The self-made modified emulsified asphalt has high solid content and softening point,which can be used as interlayer bonding material to provide excellent shear strength.In the design of mixture proportion,the gradation is optimized by adding 6.3mm control sieve pore,and the performance of mixture is verified.In combination with the application example of extremely thin wearing course in preventive maintenance engineering of bridge deck asphalt pavement of Taijin expressway,the quality control points of construction of extremely thin wearing course are systematically summarized,which can provide reference for preventive maintenance of asphalt pavement on bridge deck of expressway.