The Test Research Of Concrete Durability Under Recombination Action Of Load And The Salt Solution

The durability of concrete and the life prediction is one of the hot issues in the engineering field. Many concrete structures are often in the environment with high concentration sulfate and chloride salt corrosion, such as physical environment, and its subject to load. Therefore, the research of the life prediction and the durability of concrete under sulfate chloride salt as well as the load is great significance.Based on the experimental study on the concrete in single factor (sulfate) double double-factor (sulfate and chlorine salt) three factors (sulfate and chloride salt and Bending load) under the action of damage evolution law. when establishing the concrete relative dynamic elastic modulus evolution equation it is necessary to consider Strength grade, bending load chlorine salt and sulfate and the concentration of them and their influence of concrete damage. The experiment study on reinforcement corrosion rule and rule of concrete damage in the sulfate and chloride salt, complex under the action of load is double and triple factors. Studying on the sulfuric acid root ion and chloride ion diffusion rule of the concrete under the action of single or and double factors of chloride salt and sulfuric.Analysing the diffusion model of chloride ion in concrete, and its diffusion system and combined with the ability to change rule. Considering the intensity level, bending loads, chloride concentration and sulfate concentration effects of chloride diffusion coefficient of variation relationship. Consider the concrete strength, bending load, sulfate, chloride diffusion coefficient of attenuation, the chloride ion binding capacity, fixed concrete life prediction model.Under sulfate, chloride salt as well as the load, the concrete’s dynamic modulus of elasticity, first after rising downward trend.Chlorine salt can delay the concrete damage rate of chlorine salt, the higher chlorine salt concentration is, the greater effect on delaying the damage of concrete. Bending load delayed the compressive zone of concrete damage process, but the effect is not obvious.Concrete in sulfate, chloride and loads, corrosion potential as the corrosion of the increase in age is gradually reduced; the corrosion current density is gradually increased with the increase in age of corrosion, bending loads to promote steel corrosion. Reinforced concrete injury is a complex process of composite effect.Concrete in single, sulfate and chloride salt complexes environmental effects, its internal concentration of the sulfate ion decreases with the depth increases. Concrete the single chloride, sulfate and chloride complex environment under its internal freedom chlorine ion and chloride ion concentration as the depth increases gradually reduced. Equivalent corrosion environmental effects, at the same depth ion concentration gradually increase with increasing corrosion age. Under the same conditions, the concrete strength lower the rank, the greater the concentration of its internal ion. Single chloride concrete under the corrosive effect of free chlorine ion diffusion coefficient and total chloride ion diffusion coefficient with increasing etching time gradually decreases, The presence of sulfate chloride diffusion coefficient decreased and then increased trend. Concrete strength grade is lower, the greater the ion diffusion coefficient. The chloride binding factor improves concrete strength increases, decreases with increasing sulfate concentration.