Re-Alkalization Effect Experiment and a New Re-Alkalization Control Model of Carbonated Concrete

Abstract

The re-alkalization technology of carbonated concrete can effectively restore the alkalinity of concrete, but the effect of re-alkalization is affected by many factors, such as the voltage, electrolyte concentration, and current conduction time. In this paper, the re-alkalization effect of carbonated concrete under different parameter changes is studied, and the feasibility of re-alkalization technology and the selection range of parameters in its application are determined. Results show that the voltage should be controlled below 12 V or above 16 V and can be adjusted properly; the electrolyte concentration should be controlled at 0.5 molL−1; and the current conduction time is determined according to the control model. Finally, a new re-alkalization control model is obtained by regression of test data to control the re-alkalization process.