Attachment C - Sect 533-B (3-18-19) Embedded Galvanic Anodes

Description

Attachment C March 18, 2019 SPECIAL PROVISIONS FOR SECTION 533-B: EMBEDDED GALVANIC ANODES The 2019 Edition of the New Mexico Department of Transportation Standard Specifications for Highway and Bridge Construction shall apply in addition to the following: 533-B.1 DESCRIPTION Embedded galvanic anodes are designed to provide localized corrosion protection. When placed at the appropriate spacing along the perimeter of the concrete patches or along the interface between new and existing concrete, the anodes mitigate the formation of new corrosion sites in the existing concrete in adjacent areas. The Contractor shall furnish all Materials, storage, handling, tools, Equipment, labor, and other appurtenances necessary to complete the Work. 533-B.2 MATERIALS 533-B.2.1 The Contractor shall furnish pre-manufactured galvanic anodes designed for cathodic protection when embedded in concrete and tied to steel reinforcing. The core of the anode shall consist of a minimum of 100 grams (3.5 oz) of electrolytic high grade zinc in compliance with ASTM B 418 Type II cast around a pair of steel tie wires and encased in a highly alkaline cementitious shell with a pH of 14, or encased in a Material that uses activation methods to assure performance. The anodes shall have one side that is less than 1-1/2” in height. 533-B.2.2 The Contractor shall use repair mortars and concretes in accordance with Standard Specifications Section 533, “Concrete Structure Repair” and shall be Portland cement based Material with suitable electrical conductivity less than 15,000 ohm-cm. Repair mortars shall be tested and approved Acceptable, by the manufacturer of the galvanic anodes or independent testing agency, for use as a low resistive conductive Material meeting the requirements of <15,000 ohm-cm. Non-conductive repair Materials such as epoxy, urethane, or magnesium phosphate shall not be permitted. The repair mortars or concretes shall be submitted to the Project Manager for approval. The repair mortar and concrete Material will be paid for under Standard Specifications Section 533, “Concrete Structure Repairs”. 533-B.3 CONSTRUCTION REQUIREMENTS 533-B.3.1 Galvanic Anode Installation The Contractor shall install the galvanic anodes per the manufacturer’s installation instructions. The manufacturer’s installation instructions shall be the governing document. If manufacturer installation instructions do not exist, the following shall apply: 1.