Application of Lightweight High Performance Asphalt Thin Layer in Bridge Deck Pavement in Coastal Environment with Mild Salt Erosion
In order to improve the quality of bridge deck pavement under coastal mild salt erosion environment,based on Ruiyunnanlu Bridge of Zhanjiang Avenue,the lightweight bridge deck pavement structure with improved asphalt performance,optimized mixture grading and reduced 1.5cm thickness has been adopted to pave the bridge deck,and the performance of different asphalt mixtures have been verified under simulated coastal mild salt erosion environment.The results have shown that:being compared with the original design of the surface layer asphalt mixture,Marshall residual stability of asphalt mixture soaked in water(increased by 5.2%),freeze-thaw splitting strength ratio(increased by 5.8%),dynamic stability at 60℃(increased by 1 683 times/mm),shear strength(increased by 0.33MPa)and fatigue times(increased by 514 628 times)have been significantly improved.The test section of light weight bridge deck pavement structure has good pavement performance.In the process of rolling,as for the surface layer of lightweight bridge pavement structure,being compared with only using steel wheel roller,it has been recommended to use the process of steel wheel roller and rubber wheel roller for rolling when the initial pressure temperature is below 165℃and the final pressure temperature is above 110℃,so as to ensure the compaction and overall compactness of asphalt pavement.
mild salt erosionlightweightbridge deck pavementapplication
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