Study On Durability Improvement Method Of Concrete Based On Bidirectional Electroosmosis Method

High chloride environment is very disadvantageous to the durability of concrete.How to Effectively Enhance the Service Life of Concrete Structures in High Chlorine Salt Environment,For a long time,it has been a difficult problem in academia and engineering research.As a new type of chloride-resistant precursor technology of concrete appearing in recent years,many researchof Bidirectional electroosmosis technology in laboratory,but it is still less used in engineering practice.On the one hand,the difficulty lies in the immaturity of technology.it is short of the electroosmosis effect achievement,and so as how to choose the Rust inhibitorresearch.On the other hand,due to less engineering experience,the effect of bidirectional electroosmosismethod in practical engineering and how to carry out bidirectional electroosmosis construction for existing engineering structures with different shapes need to be studied..In this paper,the short-term life extension experiment of two-way electroosmosis method is used to evaluate the electroosmosis effect of triethylenetetramine as a rust inhibitor.Through experiments,it is found that the thickness of protective layer of concrete blocks has a significant effect on chloride ion discharge when triethylenetetramine is used as a rust inhibitor in double electroosmosis technology.in different experimental environments,the residual amount of organic matter in the sample and the surface of steel bars,the ability of concrete to prevent chloride ion from re-invading and corrosion and the long-term stability of electrochemical parameters of steel bars were studied.Relevant data from wet-dry cycle experiments show that the electrochemical parameters of the specimens treated by bi-directional electroosmosis using triethylenetetramine as a rust inhibitor are the most stable,the corrosion phenomenon of steel bars is the least obvious,the ability to resist the re-invasion of chloride ions is the strongest,and the residual amount of rust inhibitor is the largest after long-term experiments,which is suitable for wide application in steel bar corrosion protection engineering.Subsequently,based on the previous experimental research,this paper developed a complete set of equipment for concrete bidirectional electroosmotic rust resistance and longevity extension,including the design of bidirectional electroosmotic rust resistance and longevity extension control device and the design of fixing device of anode system.In view of the existing structure,the optimum design of chloride ion concentration and potential measurement of steel bar in electroosmosis control system is carried out.According to the different use occasions,the test device under indoor test conditions and the control device under field exposure environment were designed and developed respectively.According to the change of outdoor use environment,the long-term maintenance of the rust inhibitor,the applicability of the device,the detection of the rust inhibitor and the quick installation of the device were designed,and the indoor experiment was optimized and improved.Make it more in line with the conditions of practical application of Engineering.In addition,in order to solve the problem of evaporation and leakage of anode electrolysis,the fixing device of anode system was designed.Finally,this paper introduces the application of bidirectional electroosmosis technology in the durability extension project of a sea-crossing bridge.The data show that the bidirectional electroosmosis control system has good stability in engineering application,and the hardware device has achieved good results in bidirectional electroosmosis in the area of water level fluctuation.Through engineering data,the difference of electroosmosis effect between practical engineering and laboratory is analyzed,which provides a reference for later engineering development.