Analysis Of The Durability Index Of Concrete Under Of Sulfate Attack Conditions

The issues of the durability of reinforced concrete structures are commonly encountered during the engineering practice,the durability of concrete structures on the ground has been studied by various researchers around the world.In recent years,with the large number of infrastructure have been put into use and built,as the vast territory of our country,the issues of the durability of engineering structures are complex and diverse.When the concrete structures under the interaction of sulfates,the mechanics and durability of concrete structures have been weakened greatly,which seriously endanger the safety and the use of the structure.Therefore,carry out the experimental study on the concrete under the interaction of sulfates with important economic and social value.In this article,the main work have been carried out is included in the following aspects:1、The importance of the durability of concrete structures was explained in the article,also introduced the basis and backgrounds of this research.The overview of structural durability of concrete under sulfate attack condition is expounded through y concrete internal factors,external factors,and coupling effect of internal and external factors.The status quo of the research of the durability of basic structural concrete is described in this paper.In this paper,the study of the existing problems is also pointed out.2、For concrete of C30 and C40 commonly used in engineering,In concrete water-binder ratio,indoor experimental study is carried out through the main factors of erosive solution concentration and immersion age.The cube compressive strength,static modulus of elasticity,compressive strength,weight,dynamic modulus of elasticity of concrete,concrete resistivity and diffusion coefficient of chloride ion in concrete are tested.3、According to the test results,the impact of mechanical properties and physical of concrete material under the same environmental conditions is analyzed in the article.Analysis showed that: water-binder ratio had a greater impact on physical and mechanical and durability of concrete.4、According to the test results,the influence of erosive solution concentration on the physical mechanics and durability of concrete is analyzed.Analysis showed that: with the concentrations of sulfates ranged from 0mg/L to 15000mg/L,variation width of splitting tensile strength,resistivity of concrete and chloride ion diffusion coefficient are more sensitive with the increasing of the solution concentration.5、According to the test results,the physical and mechanics and durability of concrete changes with the age of experimental period researched in the paper.Analysis showed that: resistivity of concrete,splitting tensile strength,quality,and chloride ion diffusion coefficient are more sensitive with the change of the solution concentration of aggressive.