Research On The Property Of Composite Mortar Based On The Sacrificial Anode Protection

Yearly, Reinforced concrete buildings damaged because of the pollution of the chlorine ions especially in coastal areas. Currently the main method in China of reinforcing such building is to chisel the loose protective layer of concrete, and do surface treatment to the rusty rebar, then reinforce with the high strength grade mortar. However, this method does not perform well. You need to do it again in two or three years later.The Sacrificial Anode Protection is one method on electrochemistry. It can fundamentally prevent the corrosion of the steels. In the Sacrificial Anode Protection of existing buildings, mortar is used as Electrolyte. However, the high resistivity of mortar in atmosphere results in the lack of protection current, and limits the application of the Sacrificial Anode Protection in concrete buildings. So how to reduce the resistivity of the mortar is just the key to the application of the Sacrificial Anode Protection in concrete buildings. Meanwhile, the mechanical property is also important to the repair mortar.This paper systematically studied the effect of the carbon fiber and the bentonite to the resistivity and the mechanical property of the mortar. And on the basis of it, this paper studied the best amount of the carbon fiber and the bentonite for the Sacrificial Anode Protection of existing buildings.This paper systematically studied the effect of the carbon fiber and the bentonite to the resistivity of the mortar. The carbon fiber and the bentonite could both reduce the resistivity of the mortar. And the resistivity of the mortar would raise along with the age of the mortar.This paper studied the effect of the carbon fiber and the bentonite to the mechanical property. The carbon fiber could do good to the rupture strength but had no effect on the compressive strength. The bentonite could do harm to both of the rupture strength and the compressive strength. On the base of the above conclusions, this paper designed the best amount of the carbon fiber and the bentonite for the Sacrificial Anode Protection of existing buildings.0.7%is the best amount when carbon fiber is the only additive. And both0.7%of the carbon fiber and20%of the bentonite added to the mortar would be the best for the Sacrificial Anode Protection.