ABSTRACT
It has been confirmed by many researchers that lithium salts have the effect of suppressing ASR-induced expansion of concrete. Supposing the application of the lithium salts as a repair additive for concrete structures deteriorated by ASR, sufficient amounts of Li+ must be driven into the ASR-affected concrete. Then, an electrochemical technique to accelerate the penetration of the lithium ions (Li+) in a lithium-based electrolyte solution into concrete has been developed for the purpose of suppressing ASR-induced expansion due to Li+. However, from the results of past research works, the penetration area of Li+ is limited around the concrete surface and it is difficult to carry Li+ into the deeper part of concrete. In this study, experimental investigations were carried out aiming to grasp the influence of the kinds of lithium salts and the temperature of the electrolyte solution on the migration properties of ions in concrete and ASR-induced expansion of concrete. Moreover, chemical compositions of white products around the steel bar in reactive concrete were analyzed after the electrochemical treatment.
