电沉积法封堵混凝土裂缝的效果与机理

Effect and Mechanism of Electrochemical Deposition Method for Plugging Concrete Cracks

摘要:

采用Cu、Zn、Fe阳极材料及CuSO₄、ZnSO₄、Fe₂（SO₄）₃电解液，通过电化学沉积方法（EDM）来封堵钢筋混凝土裂缝，对比分析了电流密度、电解质溶液浓度和电沉积时间对裂缝表面闭合率、裂缝抗渗系数、离子在裂缝中的扩散深度及电极质量损失率等的影响，并通过X射线衍射和扫描电镜分析了电沉积产物的组成与形貌.结果表明：愈合裂缝中电沉积物的结晶程度较高，形态各异；较低的电流密度和电解液浓度最有利于EDM的堵漏效果.

Abstract:

Cracks in reinforced concrete were sealed by electrochemical deposition method（EDM）. Three types of anode materials， Cu， Zn， Fe and their corresponding CuSO₄， ZnSO₄， Fe₂（SO₄）₃ electrolytes were used in EDM. The effects of current density， electrolyte solution concentration， and electrodeposition time on crack surface closure rate， crack impermeability coefficient， ion diffusion depth in cracks， and electrode quality loss rate， were analyzed. The composition of the electrodeposited products was analyzed by X-ray diffraction and scanning electron microscopy. The results indicate that the degree of crystallization of electrodeposits is relatively high， and their shapes vary overall. Lower current density and lower electrolyte concentrations are most beneficial for the plugging effect of DEM on concrete cracks.