Study And Project Suggestion On The Damage Of Bond Stress Between Steel And Concrete In The Western Region Of Jilin Province

In the natural environment, changes a number of factors, such as:temperature, humidity, soil characteristics, pH and so om, which can lead to premature degradation of the performance of concrete structures, can not achieve the desired functions and life. The problem of durability of reinforced concrete structures has become a worldwide concern, and is needed to solve the problem. The damage of bond stress between steel and concrete is one of the major factors leading to reduction in the durability of reinforced concrete structures, and therefore damage of the bond stress between steel and concrete must be strengthened. For now, domestic and foreign scholars study on the bond stress between steel and concrete under steel rust and freeze-thaw are more, but for study on the damage of steel and concrete bond stress under the two freeze-thaw cycles and salt corrosion action is relatively small. the western region of Jilin soil contains a lot of HCO3-, SO42-,Cl-plasma, the above situation will make the structural performance of reinforced concrete damage and reduce the life of the building and use features.Thus, for the western region of Jilin steel and concrete bond stress damage under freeze-thaw cycles and complex dual role of salt corrosion, can provide some theoretical data for similar areas of reinforced concrete design, has some practical significance.The paper is divided into three parts experiments, specific pilot studies are as follows:1, Reinforced concrete building will be subject to a certain extent in the salt marshes soil erosion, this paper study on the soaked in salt solution specimen bond stress damage between steel and concrete, and research center to pull out the tests. Tests showed:The bond stress damage between steel and concrete increases with composite salt content increases.2, Reinforced concrete building under the influence of the freeze-thaw cycles structural performance will be reduced, the damage of bond stress between steel and concrete will be reduced, so this paper study on the damage of steel and concrete bond stress under the freeze-thaw cycles, and research center to pull out the tests. Tests showed that:the quality of the specimen after freeze-thaw cycles and relative dynamic elastic modulus decreased, the bond stress between steel and concrete also reduced. With the increase of freeze-thaw cycles, the mass loss of the specimen, the relative dynamic elastic modulus and bond stress are reduced, aerated concrete is significantly better than ordinary concrete.3, Due to the environmental characteristics of the western region of Jilin, buildings will be subject to a common effect of salt corrosion and freeze-thaw cycles, so this paper study on the damage of steel and concrete bond stress under the two freeze-thaw cycles and salt corrosion action, and research center to pull out the tests.Tests showed that:the quality of the specimen through the combined effect of both post and relative dynamic elastic modulus decreased, the bond stress between steel and concrete also reduced. With the increase of complex salt mass fraction and freeze-thaw cycles, the mass loss of the specimen, the relative dynamic elastic modulus and bond stress are reduced, aerated concrete is significantly better than ordinary concrete.This paper summarizes the above tests of reinforced concrete bond stress and the deterioration of damage, with some reference value and significance of the actual project.