A Experimental Study Of Asphalt Treated Permeable Basement Layer

With the quick development of economic and the adding traffic,There are a lot of damage in the highway. Aeeording to a lot of investigations on pavement service condition,inadequate subsurface drainage of pavement has been identified as a Primary cause of unsatisfaetory Pavement Performance and Premature failures.It is commonly reeognized that subsurface drainage system can improve pavement performance and extend service life.In order to ensure the use of drainage asphalt pavement durability, at the grassroots level to obtain better drainage conditions, the asphalt gravel grass-roots level should also have good resistance to permanent deformation ability and sufficient strength and some slack capacity. This paper identified the gravel asphalt mixture design principles and design specifications, and design method in accordance with the characteristics of volume, respectively, from the rough skeleton of the type of materials, fine aggregate and the best filling factor in the distribution of a comprehensive analysis to determine the gravel asphalt mixture materials design approach to design to meet the requirements of the different gap asphalt crushed stone mixtureIn the third chapter focuses on testing the ordinary petroleum asphalt roads and high-viscosity modified asphalt mixture of asphalt aggregates the compressive strength, resilient modulus, dynamic stability, as well as the changes of the frozen stability, as well as different gaps broken asphalt structure Stone on the above road performance impact. Through the test data analysis, defined to meet the performance requirements of the asphalt pavement gravel gap range of the ordinary heavy traffic road asphalt, the porosity should be less than equal to 20% of high viscosity modified asphalt, the porosity can be relaxed to less than or equal 25%.In order to solve a larger porosity and lower permanent deformation requirements of contradiction, this research project the skeleton - the gap of the permanent deformation of asphalt rubble. An emphasis on grass-roots common drainage gravel asphalt and modified asphalt mixture dynamic loads in the initial instantaneous deformation, permanent deformation, the slope of the cumulative permanent deformation and deformation of a comparative analysis of the structure through different gaps gravel asphalt mixture dynamic load indentation test, get a different gap structure of the stress - the initial plastic deformation curve, identified porosity of 20% (level with type 4-0.65-0.7) of gravel asphalt mixture has the best compaction performance. Accumulation of permanent deformation reflects the duplication of material at different traffic loads under the action of the deformation resistance, through the experimental data analysis shows that the gap structure is 15% -20% of the gravel asphalt mixture has a good ability to resist heavy rutting. The gap structures of different permanent deformation of asphalt aggregates with the dynamic stress and increase the growth rate, indicating that the greater the dynamic stress, the faster the growth rate of permanent deformation, the corresponding value of the larger permanent deformation. Comparison of four different structures in the gap, the gap structure of 15% of the asphalt under the rubble of the deformation of the slope of the stress minimum. Void fraction less than or equal 20% of the gravel asphalt mixture in a variety of loads with good resistance to permanent deformation capacity. Taking these some experimental conclusions, determine the gap structure of the final 15% to 20% of the asphalt gravel mixture with good structural stability of the gap, under heavy loads, has good resistance to permanent deformation capacity.