Galvanic panel with compliant construction
View Patent ↗A prefabricated sacrificial galvanic anode panel includes a rigid or semi-rigid backing board or similar support surface over which a thin layer of cement, mortar or adhesive is applied for holding a compliant layer of material in place on the support surface. The layer of wet adhesive, cement or mortar is sufficiently thin so that upon drying it does not cause warping of the support surface. The compliant or spongy layer is laminated or sandwiched between a thicker layer of ionically conductive galvanic mortar and the substrate support surface. The compliant or spongy layer prevents the thicker layer of galvanic mortar from wetting the backing board or substrate support surface so as to prevent warpage upon drying of the thicker layer of galvanic mortar and also accommodates the expansion of corrosion products from the galvanic anode material.
1. A compressible galvanic panel constructed for attachment to a concrete structure, comprising:
a base layer comprising a backer board having a preformed shape;
an adhesive applied over said base layer;
a layer of compliant compressible air filled material having void spaces therein and held on said base layer by said adhesive;
a layer of galvanic mortar applied over said layer of compliant compressible air filled material such that said layer of compliant compressible air filled material separates said adhesive and said layer of galvanic mortar and prevents passage of said adhesive and said layer of galvanic mortar therethrough; and
a sacrificial galvanic anode material provided in said layer of galvanic mortar; and
wherein said layer of compliant compressible air-filled material comprises a first side bonded to said base layer, a second side bonded to said sacrificial galvanic anode material, and a compliant compressible layer unfilled with said adhesive and said galvanic mortar;
wherein said compliant compressible layer comprises an open air filled layer between said first and second sides of said layer of compliant compressible air-filled material which compressively absorbs stresses and expansion of corrosion products from said sacrificial galvanic anode material.
2. The panel of claim 1 , wherein said layer of compliant compressible air filled material comprises a fabric material.
3. The panel of claim 1 , wherein said layer of compliant compressible air filled material comprises a spongy material.
4. The panel of claim 1 , wherein said adhesive comprises a layer of adhesive which is thinner than said layer of galvanic mortar to reduce wetting of said base layer.
5. The panel of claim 4 , wherein said layer of adhesive comprises a layer of mortar.
6. The panel of claim 1 , wherein said sacrificial galvanic anode material comprises zinc.
7. The panel of claim 6 , wherein said sacrificial galvanic anode material comprises a zinc mesh and wherein said layer of galvanic mortar extrudes through said zinc mesh.
8. The panel of claim 1 , wherein said layer of compliant compressible air filled material comprises a thickness of about 1/16 to ¼ inch.
9. The panel of claim 1 , wherein said layer of compliant compressible air filled material prevents said layer of galvanic mortar from wetting said base layer.
10. A reinforced concrete structure, comprising:
a layer of concrete;
a steel reinforcement at least partially embedded in said layer of concrete;
a galvanic panel attached on said layer of concrete, said galvanic panel comprising a base layer comprising a semi-rigid backer board having a preformed shape, an adhesive applied over said base layer, a layer of compliant compressible air filled material having void spaces therein arid held on said base layer by said adhesive, a first layer of galvanic mortar applied over said layer of compliant compressible material, and a sacrificial galvanic anode material provided in said first layer of galvanic mortar wherein said layer of complaint compressible material separates said adhesive and said layer of galvanic mortar and prevents passage of said adhesive and said layer of galvanic mortar therethrough
wherein said layer of compliant compressible air-filled material comprises a first side bonded to said base layer, a second side bonded to said sacrificial galvanic anode material, and a compliant compressible layer unfilled with said adhesive and said galvanic mortar;
and wherein said compliant compressible layer comprises an open air filled layer between said first and second sides of said layer of compliant compressible air-filled material which compressively absorbs stresses and expansion of corrosion products from said sacrificial galvanic anode material; and
an electrical connector electrically connecting said sacrificial galvanic anode material and said steel reinforcement.
11. The concrete structure of claim 10 , wherein said electrical connector comprises a steel wire.
12. The concrete structure of claim 10 , further comprising a second layer of galvanic mortar between said layer of concrete and said galvanic panel.