The Application Of Lime Fly-ash Stabilized Aggregate Base Course For Asphalt Pavement

Based on "The Application Research of Lime-fly-ash in Urbane Road Engineer Project", with a special view to its practice and with the studies home and abroad taken into account, this thesis is to deliver some conclusions after a lot of experiments on lime fly ash stabilized aggregate base course:This thesis has a general study of the mechanics property and pavement performance of the lime fly ash aggregate base courses in the view of the properties of the raw materials and the requirements for their application, the gradation and the ratio of aggregate, the mechanism for its strength, and the addictives influence on the strength. This thesis also compares the properties of the aggregates, single size or continuous gradation. Then the thesis proposes the design method of embedded skeleton density structure of lime fly ash stabilized aggregate mixtures.In the study of the interaction between the lime fly ash and aggregate, the thesis argues that the strength changes with the change of the aggregate gradation and the ratio of the materials, and the smaller the graded size and the ratio of lime-fly-ash to other materials are, the weaker the strength is, and this results in the weaker ability of anti-crushing, anti-water-erosion and anti-brushing.In the experiment where mixtures is added addictives, the thesis proposes that the strength of lime-fly-ash aggregate is improved at the early periods when it is added addictives. This is especially obvious when the addictive is cement, and the strength grows with the various curing periods. With the help of X-Ray Diffraction and Scanning Election Microscopy, the thesis also analyzes the influence of crystal structure of the cement lime fly ash aggregate on the mixture strength.The thesis also explores the construction quality control and test on lime fly ash aggregate base courses, and introduces the technology where Penetration Ground Radar helps undamaged survey. Also the thesis compares the ways for them economically, the cost of lime ash fly stabilized aggregate is lower.Finally, the thesis proposes a typical structure of asphalt pavement for Yueyang Urbane road after a general study of its traffic volume level and subgrade strength level with the properties of semi-rigid base materials being in consideration, regard the surface pavement depth related on traffic, the base course depth related on subgrade strength. On the other side, the thesis discuss the proper depth of pavement.