MICROSTRUCTURE AND MECHANISM OF CRACKS REHABILITATION IN REINFORCED CONCRETE USING ELECTRODEPOSITION TECHNIQUE

摘要

This paper reports on the design of an experimental device for cracks rehabilitation inreinforced concrete, using an electrodeposition method, firstly. The composition andmicrostructure of the electrodeposits in cracks and the crack healing effectiveness werestudied. The Effect of current density on the microstructure of crystals, deposited in the crackswas investigated and the electrodeposition mechanism of crack healing was discussed. Theresults indicate that the Composition of the electrodeposits differs depending on the usedelectrolytes. Current density plays an important role on healing effectiveness of concretecracks. The Mg(OH)2 crystals produced in high current density regimes are large, lamellarand arrange loosely. The crack healing mechanism lies in that electrodeposits produced bycell reaction induce into nucleation and form insoluble crystals in cracks, and consequentlythe electrodeposits fill and heal concrete cracks gradually.