Application Technique For Long Span Steel Deck Gussasphalt Concrete Pavement

The gussasphalt concrete has good performances,such as water protection, fatigue resistance and bonding ability with steel deck.As steel deck surfacing material, it has been used for many years at abroad. With the rapid development of long-span bridges in China, to make extensive study of the surfacing structures and properties of the gussasphalt has an important theoretical value and expansive application. Aiming at the research project on the steel deck surfacing of Southern Branch Bridge of Runyang Yangtze River Bridge in China, referencing the overseas successful experience especially in German,and using the method of the laboratorial tests,mechanical analysis and field trials,the thesis studies deeply the gussasphalt pavement technology on the steel deck which adapts to the special climate and traffic character in China. The paper presents the gussasphalt pavement project for Southern Branch Bridge of Runyang Yangtze River Bridge. The research results have been successfully applied in the trial section of repair project of Jiangyin Yangtze River Bridge.Analyzing the classical suspension bridges of Jiangyin Yangtze River Bridge in China and Bosporus Channel Suspension Bridge in Turkey by the finite element method,the author concludes that the special overload heavy traffic and the sustained high temperature in summer are the main factors which affects the service performances of gussasphalt pavement in China.According to the Chinese new asphalt technical criterion,SUPERPAVE asphalt binder criterion and SHRP tactic asphalt project, the author compares the properties of five kinds of modified asphalt and four types of common oil bitumen by laboratorial tests,and suggests that the SHELL Cariphalt which modified by SBS polymer is adopted as the basal bitumen for gussasphalt binder.By drawing lessons from the gussasphalt mixture design at abroad, the author presents the design method and test evaluation of the gussasphalt. The suitable asphalt surfacing has been proposed for Southern Branch Bridge of Runyang Yangtze River Bridge. By the series of tests such as the Lueer test, high temperature rut test, high point bending test, indirect tensile test, freezing and thawing splitting test, and fatigue test of composite beam, the new type gussasphalt presented not only retains the existed goodness but also has better high-temperature stability.In the end,the author studies the construction technique for the long-span steel deck gussasphalt pavement by paving the trial bridge.