The Steel Deck Bridge Pavement Structure Of Gussasphalt Concrete

In recent years, with the rapid growth of China’s overall strength, long span steelbridge construction has developed rapidly. Steel Structure Bridge is widely used for itscharacter of high strength, large rigidity, light in weight, and convenience ofconstruction. Gussasphalt (GA) concrete has good performances of waterproofness,ageing resistance, antifatigue and retroactivity to steel panel. Therefore, Gussasphaltconcrete is applied in steel bridge deck pavement for several years in abroad, especiallyin Europe, Japan and other countries. Based on the research of steel deck pavementmaterial properties and structure of Chongqing construction science and technologyplanning projects, and combined with Chongqing Yangtze River bridge’s deckpavement, the dissertation searches the best dosage of Styrene-butadiene-styrene（SBS）block copolymer modified asphalt, researches the material performance, structuralperformance and the interface processing methods of different Gussasphalt concretesteel bridge deck pavement structure, and chooses the best pavement structure andinterface processing of Gussasphalt concrete steel bridge deck by referring to theforeign researches, and theoretical analysis and laboratory tests.Firstly, the basic properties of the raw materials were researched. Differentproportions of dosage were added to finished SBS modified asphalt, according to thecharacteristics of GA and Stone Matrix Asphal (SMA) asphalt mixture. It proposes themodified asphalt performance indicators and determines the appropriate blending ratioranges and optimal dosage, through studying three indicators of SBS modified asphalt.Secondly, combined with relying engineering, the mixing ratios of GA and SMAasphalt mixture were researched, the design gradings of GA-10, SMA-10were proposed,and the optimal asphalt-aggregate ratios of GA and SMA asphalt mixture weredetermined in this dissertation. To reflect the high-temperature performance of GA andSMA asphalt mixture, the rutting tests were performance on single GA and SMAmixture. The results show that the high temperature stability of SMA mixture is betterthan that of GA mixture.Thirdly, four pavement structures are fabricated by using the optimal dosage of theGA and SMA asphalt mixtures: B structure type: steel deck plate+FRP laminated plate+epoxy gravel+(bonding layer+SMA10)+(bonding layer+SMA10); C structuretype: steel deck plate+FRP laminated plate+epoxy gravel+(bonding layer+SMA10)+(bonding layer+GA10); D structure type: steel bridge decks+(waterproofer, bonding layer+SMA10)+(bonding layer+SMA10); E structure type: steel bridgepanel+(waterproofer bonding layer+SMA10)+(bonding layer+GA10). Accordingto the current domestic specification of the asphalt pavement, a systematic evaluationwas implemented to the high-temperature stability, the low temperature crack resistance,and the water stability of four pavement structures. And a comparative study of theperformance of four pavement structure pavement was achieved.Finally, the type and processing method of pavement structure interface areproposed. Through interfacial shear tests, the interface of different steel deck pavementstructure and the anti-shear properties of different adhesive layer interface were studiedin the dissertation. Furthermore, it tested the reasonableness and reliability of steelbridge deck pavement structure interfacing, and analyzed the structural and functionaladvantages of the new pavement structure interface connection structure. The resultsshow that almost all shear tests of the four types of pavement structure interface occurin the detection of the interface, and more than95%destruction are made by pure sheardestruction along the shear interface, and the shear strength of steel plate and FRPlaminated plate is highest.In conclusion, the findings of the dissertation are achieved through the abovelaboratory tests: the performance of type B and type C are superior to that of thetraditional pavement structure; the interfacial bonding properties of the type B is worsethan that of type C; type C is more suitable than the type B under the condition ofconstruction guarantee.