PROJECT NAME
Sacrificial Anodes
DURATION
Four months
BRIEF
Vale CRW was instruced to install a Sika concrete repair system to two marine structures.
The Project in Detail
Vale CRW was instruced to install a Sika concrete repair system to two marine structures. The system required using sacrificial anodes to help prevent carbonisation.
What are Sacrifical Anodes?
Anodes are made of a more active or less noble metal (usually zinc or aluminium). The sacrificial anodes are attached to the steel structure and since they oxidize more easily, they turn the structure itself into a cathode. The electrons leave the structure through the anodes which slowly dissolve. Applying this physics principle protects the steel structure against corrosion.
System Components
- Sika monotop 1010 primer
- Sika galvashiled XP2 sacrificial anodes
- Sika monotop 4012 repair mortar
- Sika monotop 3020 smoothing coat
- Sika ferrogard 903
- Sikagard 550w elastic paint
- Sikagard 552W aqua primer
System of Works
All spalled concrete soffits were broken out to a minimum depth of 20mm behind the existing rebar. Deeper pocket were broken out behind for the rebar where anodes were being installed. Sika galvashield XP2 anodes were then installed to the existing rebar as per the anode drawing provided. A multi meter was then used to check the continuity between the anodes and rebar to ensure correct installation. The rebar was then mechanically cleaned before applying Sika monotop 1010 primer to help prevent carbonisation. Sika monotop 4012 repair mortar was then trowel applied to leave a flat smooth finish. All unrepaired ares of the concrete soffits were treated with Sika ferrogard 903. As the client wanted to keep the exisitng concrete finish to the soffits (rather than plaster), two coats of sika monotop 3020 were trowel applied to leave a smooth paintable finish. Vale CRW then used an airless paint sprayer to apply sikagard 552w aqua primer and two coats of Sikagard 550w elastic paint.