Cathodic Protection with Linear Anodes (PI-Slit method)

Chloride ions penetrate into concrete due to airborne salts and snow-melting agents, and salt corrosion of steel has become a serious problem. The PI-Slit method is one of the cathodic protection methods using a linear anode system with an external power supply. One or more linear anodes are placed in grooves of about 5 mm in width cut in the concrete surface, and then cement mortar with high fluidity is poured or injected.

Post-Tensioned Prestressed Concrete T-Shaped Girder Bridge

Reinforced Concrete Pier

Steel material's corrosion caused by the permeation into concrete of chloride ions from airborn sea salt and the use of snow melting agent can lead to serious damage for concrete structures. Titanium grid-typed cathodic protection - one of the linear-anode-method using external power supply is recognized as a very reliable method due to many achievement up to date.
Titanium anodes are placed horizontally at cutting groves on the concrete surface, then a reduced current is applied to the rebar to suppress corrosion of the rebar. The method is highly applicable to structures with small cover, and can be combined with the PI-Slit method, which is an electro-corrosion protection method that reduces costs by installing anodes in the vertical direction.

Application example of the titanium grid method