Study On High-temperature Performance Of MA Pavement System Applied On Steel Bridge Deck With Accelerated Pavement Testing

With the establishment and use of long-span steel-box bridge, steel deck pavementtechnology has been a key technology of long-span steel bridge. As a common material usedin steel deck pavement, MA (Mastic Asphalt) is of excellent waterproof, ageing resistance,fatigue resistance and great compliance of steel deck. It has been applied in the foreigencountries for years. The reason MA has not been popularized and applied in our country isthat its anti-track performance under high-temperature is not good enough. Foreignapplication experiences of MA are not suitable for our climate and transportation realities. Forthe problem of MA high temperature performace, with using large Accelerated PavementTesting(APT) and indoor laboratory tests, this paper mainly adjusts and optimizes design ofMA pavement system, presents the recommended proposal that is suitable for the MApavement system of Hong Kong-Zhuhai-Macau Bridge and estimates tracks of the actualbridge base on the proposal.In the first chapter, by means of surveying the application of steel deck pavementtechnology in the surrounding area of Hong Kong-Zhuhai-Macau Bridge, this paper explainswhy chooses MA pavement system as a recommended proposal, refers to successfulengineering cases and make suggestions and technical indexs which target for hightemperature performance of MA pavement system. Considering the importance of HongKong-Zhuhai-Macau Bridge and difficulties of steel deck pavement technology, we decide touse APT to simulate the application of bridge deck pavement under different vehicle loads andenvironments.In the contex of deciding MA pavement system as foundation of research, then this paperdesigns composite structure MA and SMA respectively, pavement layer of the APT. For MA,it refers to make the design in the consideration of accelerated loading experiment andprocessing property. In the terms of processing property, it mainly presents in the applicationof GA technology to produce MA which can increase efficiency and the improvement of hightemperature performance of MA by adjusting mixing temperature and mixing time.By adopting APT to study steel deck pavement performance, this paper designs theproject of accelerated loading experiment in four aspects such as steel box beam model,pavement project, parameter setting of instruments and arrangenments of sensor and track. Inthe temperature of60℃, we do two high temperature experiments. The experiments conformto controlled loading that reach50,000times and failure criterion that results in1inch rutting depth. In addition to laboratory tests, it turns out that MA layer is the main contributor thatproduces high temperature rutting; GA technology can take the place of MA technology; andaccelerated loading experiment shows a good correlation with laboratory rut tests.To predict rut deformation in the application of this pavement layer in real bridge,laboratory rut tests are done under different temperatures and different loads. The ruttingprediction model is built base on temperature-load-time. And combining with real bridge’senvironmental spectrum and load spectrum, we will get the rut depth of pavement layerwithin the designed service life.