Detailing Design Of Highway Bridge Slab Subject To Deicing Salts

The merits of durability of concrete structures are related to safety of the national economy and people's lives and property, Studies in durability of concrete structures play an important position in today's concrete research and civil, durability of concrete in salt frozen conditions is an important part of this field. At present,the is mainly occurred in the extensive use of deicing salt in the ice cold weather conditions. Basically, with the realities that most of concrete structure had work injury,how does pre-existed concrete injury enhance the damage to concrete durability caused by salt frozen situation, will have a practical significance to the study of concrete durability.Salt frozen on the destructive effects of reinforced concrete structures is mainly reflected in two aspects: First, the concrete surface erosion damage; second, deicing salts, the chloride ion in the gradual infiltration of the internal structure, causing steel corrosion. At this stage of the destruction of the salt freezing effect of the two has not yet reached the stage of quantification, the lack of an effective model to create a life of injury and the relationship between. Purpose of this study is to select the bridge slab as the research object of the current building standards, the bridge slab durability issues, combined with research on the current rationalization of highway bridges recommendations.In this study, wet and dry cycles of the specimen to create different degrees of damage, through the ultrasound equipment to define the different damage levels. Salt solution and then placed in a special specimen damage, into the freezing and thawing the freeze-thaw cycle test cases, test cycles under different concentrations of chloride ion penetration and the concrete surface erosion situation. Mathematical model, the data analysis, number of cycles and the relationship between salt and cold injury model. Calculated by the model of salt in different parts of the winter freeze damage of concrete for bridge slab deicing salts damage to this more serious object of study, under the existing norms derived useful life, make recommendations for improvement.Found that freezing injury in the salt environment, the existing highway bridge construction can not meet current building standards requirements on the use of life, the need for building a large degree of amendments to standards, and certain measures are taken in the construction, otherwise we only sprinkle deicing salts can change this tradition, so far the only effective means of deicing snow. Based on this, the subject of this study for the bridge slab, made recommendations on: (1) increasing the thickness of the bridge panel leveling, effective organization of chloride ion intrusion; (2) the tensile zone of reinforced epoxy coating applied to protect the steel; (3) increasing the leveling layer of concrete strength; (4) leveling layer and the protective layer, a layer of isolation between the wiping layer. And calculated, are feasible.