Research On Pavement Performance And Mechanical Properties Of The Asphalt Pavement With The Large-stone Asphalt Mixes Lower Course

Experts at home and abroad researched that the Large-stone Asphalt Mixes mainly treated base have good performance of delaying the reflection crack and rutting resistance.The Large-stone Asphalt Mixes used as lower course is less researched.Based on absorbing domestic and foreign scientific research experience,paper has a comparative study on pavement performance and mechanical properties of the Large-stone Asphalt Mixes.Paper studies separately on match ratio design to proposed Dense-graded Large-stone Asphalt Mixes(ATB-25,ATB-30)and Open-graded Large Stone Asphalt Mixes(ATPB-25,ATPB-30).First,referring results at home and abroad of aggregate gradation,the paper etermines gradation by means of using the varying I method and Standard method.To Dense-graded, the optimal asphalt content is determined directly through he Large Marshall test. To Open-graded, the optimal asphalt content is determined through the leakage test and the Large Marshall test. Then,Based on test research, rutting resistance,moisture stability and mechanical properties will be studied.Finally,through comparing their comprehensive performance,the best Large-stone Asphalt Mixes is selected as lower course of pavement structure.Based on construction requirements and the relationship between the thickness of Asphalt Mixes and nominal maximum aggregate size,the stress and strain of Asphalt pavement structure with same temperature and different thickness of ATB is calculated.Finally,the reasonable thickness of ATB lower crouse is recommended.