The Experimental Study Of The Application Of SMA Overlay On An Airport Runway

Based on the use experience of present highway and airport runway, this paper studies the structural design of airport runway suitable for the northeast areas, especially for Dalian. The method for this study is experiment.The paper systematically elaborated on the basic concept, characteristic and the development of usage of SMA in domestic and foreign, as a new kind of pavement material using in the runway. Integrated with study and analysis of the problems which have encountered in the application of SMA in practice, especially the overlay on the old runway, the reasons of its destruction and the problem of quality are detailed discussed from the factors of materials, structural to the climate effect.The finished overlay projects on airport runway in domestic are summarized in this paper. From the earliest project of Guilin airport, to the reconstruct of Dalian airport, the different structure, the employ of materials and the status of usage are contrasted. All experiences and lessons should be taken to promote or avoid. Corresponding improvement measures to the present problem and the issues which must be attentive are put forward. A new structural form is proposed according to the requisition to airport runway.The main part of this paper focuses on the SMA mix proportion design. The principle of SMA mix proportion design is simply introduced at first. After that, some main problems and parameters of design which should be taken attention to are explained Then the test method of the design are narrated.After studying on some finished runway overlay projects, the detailed experiments are carried on according to the key problems in SMA design before and after the project, including the choosing of materials, the design of aggregate proportion, the determination of asphalt content and modifying agent. After the overlay was finished, the field experiment is carried on to evaluate the actual effect of SMA. The data is gain at the first time. Some modifications and further studies to the steps of experiment are put forward in proportion design, combined with the problems of materials and so on. Some improvements measures are also devised form the comparison of results. Further proposal is suggested for the later projects..