Penetration of lithium into ASR-affected concrete due to electro-osmosis of lithium carbonate solution

An electrochemical technique to accelerate the penetration of the lithium ions (Li+), contained within a lithium-based electrolyte solution, into concrete has been developed for the purpose of suppressing ASR-induced expansion. From the results of past research work, it has appeared that the penetration depth of Li+ is limited to the outer concrete surface and that it is difficult to make Li+ penetrate into the deeper part of the concrete. In this study, an experimental investigation was carried out with the aim of understanding the influence of varying lithium salts and the temperature of the electrolyte solution on the migration properties of ions in concrete and their effect on ASR-induced expansion of concrete. The electrochemical migration of Li+ was found to accelerate when using a Li2CO3 electrolyte solution and with increasing temperature, with concentrations of Li+ after treatment resulting in the decreased expansion rate of concrete following such treatment.

► This research proposes an electrochemical repair method for ASR damaged concrete.
► The penetration of lithium from Li2CO3 into concrete is larger than the case of LiOH.
► The higher temperature promoted migration of Cl− and Li+ in concrete.
► Concrete expansion due to ASR was suppressed by the application of this treatment.