Analysis and discussion on the causes of early failure of pavement for highgrade highway;

Analysis on the early failure of asphalt pavement in expressway;

This paper analyzes the economic benefit and social effects of import material costs and comes to a conclusion that adopting the new technique of SMA calls for extra costs in the beginning of the projects,but it can avoid early destruction,reduce maintenance expenses and prolong service life because of its advantages.

Basing on the investigation in highway construction situation in Hubei Province, several common early destruction forms is generalized, the prophylactic-therapeutic measures and suggestions are also put forward.

The causes of early damages of bituminous pavement in high-temperature and rainy regions and their prevention and cure;

In the light of problems in the early damage of asphalt pavement,this article discusses the causes from the differ- ent aspects,including the management,the design,the construction,the raw materials and the maintenance.

Combining with real situation of expressway bridge in Hebei Province,this paper analyzes the cause of early damage of bridge asphalt surface layer,and puts forward the measures avoiding the damage.

The reasons that ratio of void caused premature failure of expressway in China are analyzed;at the same time the measures that solve the problems are put forward.

According to the damage of expansive soil on roadbed practical treatment method is presented in order to avoid premature failure of road to ensure driving safety.

Based on experimental results and theoretical analysis, the study of the classification and mechanism of the premature failure for beams reinforced with steel plate is placed on, finally, reasonable measure to overcome the premature failure is introduced.