论文部分内容阅读
Electrochemical chloride extraction (ECE), also known as electrochemical chloride removal or desalination, is based on the principle of reversing chloride ion migration by an externally-applied electrical field.It has been successfully used for the protection of reinforced concrete structure exposed to chloride environment.However,the effectiveness of ECE has been questioned once corrosion has initiated.The applied external power field can also cause other ionic effects on the concrete pore characteristics resulting in reduced pH and increased carbonation rate.This issue has become more pressing with the more widespread use blended cement concrete,using fly ash (FA) and ground granulated blast furnace slag (GGBS).Such concretes already have reduced hydroxyl ion contents and the application of ECE could accelerate the risk of an increased carbonation rate.On the other hand the higher chloride binding capacity of these mixes potentially results in more effective ECE.