Effectiveness of a conductive cementitious mortar anode for cathodic protection of steel in concrete
详细信息 查看全文
- 作者：Bertolini ; Luca ; Bolzoni ; Fabio ; Pastore ; Tommaso ; Pedeferri ; Pietro
- 关键词：Durability ; Electrochemical properties ; Cathodic protection
- 刊名：Cement and Concrete Research
- 出版年：2004
- 出版时间：April, 2004
- 年：2004
- 卷：34
- 期：4
- 页码：681-694
- 全文大小：1.49 M
文摘
The paper reports a study on the behaviour of a cementitious conductive overlay anode used for cathodic protection (CP) of steel in concrete. The anode is made of nickel-coated carbon fibres in a cementitious mortar. Tests were carried out on concrete specimens with two layers of rebars that simulated reinforced concrete slabs. Anodic current densities in the range 10–100 mA/m2 with respect to the anode surface were imposed. Steel and anode potentials, as well as feeding voltage, were monitored. Four-hour decay and the distribution of current and potential were regularly measured. Galvanostatic polarisation tests were also carried out on the anode material immersed in saturated calcium hydroxide solutions. The maximum anode current output was evaluated. The effectiveness of patch repair of the anode, on areas damaged by excessive current output, is also discussed.