Influence of anion types on the electrodeposition healing effect of concrete cracks

Abstract

With the zinc salt and magnesium salt solutions, the influence of anion types on the electrodeposition healing effect of concrete cracks was investigated, four parameters such as rate of weight gain, surface coating, crack closure, and crack filling depth were measured, and the mineral composition and appearance of electrodeposits in the cracks were analyzed. The experimental results demonstrate that the electrodeposition healing effect is the best by adopting ZnSO₄ and MgSO₄ solutions. The mineral composition of electrodeposits in the cracks does not change with the anion types. The most particles of ZnO crystal appear as fusiform by using zinc salt solutions. If we selected MgSO₄ solution, the Mg(OH)₂ crystal was porous honeycomb. The electrodeposits present as flake structure while the other magnesium salt solutions were adopted.

Keywords

Crack Closure / Magnesium Hydroxide / Crystal Face / Mortar Specimen / Zinc Salt

References

[1] Fang Zhang. Research on the Repairing Technology and Materials for Concrete Cracks[D], 2009 Daqing Daqing Petroleum Institute 2-8.

[2] Ryou J.S., Nobuaki Otsuki. Experimental Study on Repair of Concrete Structural Members by Electrochemical Method[J]. Scripta Materialia, 2005, 52: 1123-1127.

[3] Ryu J.S. Influence of Crack Width, Cover Depth, Water Cement Ratio and Temperature on the Formation of Electrodeposition on the Concrete Surface[J]. Magazine of Concrete Research, 2003, 55(1): 35-40.

[4] Yao W., Zheng Xiaofang. Experimental Study on Crack Repair of Reinforced Concrete by Electrodeposition Technique[J]. Journal of Tongji University(Natural Science), 2006, 34(11): 1 441-1 444.

[5] Jiang Z., Sun Z., Wang Peiming. Mechanism on Rehabilitation of Cracks in Reinforced Concrete Using Electrodeposition Technique[J]. Journal of Tongji University(Natural Science), 2004, 32(11): 1 471-1 475.

[6] Chu H., Wang Peiming. Influence of Additives on the Formation of Electrodeposits in the Concrete Cracks[J]. Journal of Wuhan University of Technology-Materials Sci. Ed., 2011, 26(2): 367-371.

[7] Wu Changle. Study of Morphologically Controllable Synthesis and Their Properties of ZnO Nanocrystals[D], 2008 Wuhan Huazhong University of Seienee & Teehnology 27-29.

[8] Zou Guanglong. Soft Chemical Synthesis and Characterization on Micro/Nano-structured Magnesium Hydroxide and Zinc Oxide[D], 2007 HANG Zhou Zhejiang University 60-67.