Abstract
Electrochemical chloride removal (ECR) from reinforced concrete can be considered as an environment-friendly technique since it can reduce the environmental issues arising from demolition and reconstruction. In this study, we used ultrasonic waves to promote the ECR efficiency without increasing the current density so as to shorten the overall power-on time, lowering the power consumption and electricity-induced material damage. Rebar-embedded cement mortar specimens were prepared and a set of ultrasonic-assisted ECR test devices was designed. For obtaining the optimal parameters, different ultrasonic frequencies and powers were adopted to conduct the ECR test. After that, the discharged and residual chloride ion amounts were detected to characterize the ECR efficiency. The corrosion behavior of rebar was characterized by electrochemical method. It was found that ultrasonic waves can not only promote the discharge of chloride ions, but also promote the passivation process of steel bar. For this investigation, the ultrasonic waves with a frequency of 40 Hz and a power of 60 W had the best auxiliary effect and could reduce the work time by 64%. It is considered that the ultrasound-assisted method has potential to promote the application possibilities of the ECR technique.
Highlights
Reinforced concrete structures are the most common and widely-used construction forms in the modern world
It is considered that the ultrasound-assisted method has potential to promote the application possibilities of the Electrochemical chloride removal (ECR) technique
It is significant to study the efficient rehabilitation methods of reinforced concrete structures serving in chloride-dense environments or polluted by chloride salts
Summary
Reinforced concrete structures are the most common and widely-used construction forms in the modern world. Materials 2019, 12, 2774 corrosive galvanic cells at the alternation of the old and the new, resulting in re-corrosion of steel bars [8,9] This method cannot be carried out at the same time as the normal use of the structure. Elsener et al [13] and Velu et al [14] proposed an intermittent power-on ECR method which increased the chloride removal efficiency significantly. This method utilized the contrived power-off time to increase the releasing of free chloride ions from bound ones. This paper attempts to use the ultrasonic waves to improve the ECR technique so as to promote the application possibilities of this technique
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