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Recent Projects

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Naval Air Station

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shim_trans  Summery
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shim_trans  Objective
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shim_trans  Project Background
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shim_trans  Scope of Work
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shim_trans  Bravo 25 Description
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shim_trans  Overview
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shim_trans  Crane Rail Removal
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shim_trans  Loss of Transverse
 Negative Moment
 Capacity over the
 Outboard Crane Rail
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shim_trans  Concrete Repair
 Materials
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shim_trans  Top Deck
 Repair Procedure
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shim_trans  Under Deck Repairs
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shim_trans  Cathodic Protection
 System
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arrow_right  Cathodic Protection
 System Installation
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shim_trans  Grout Resistivity
 Measurements
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shim_trans  Reinforcing Steel
 Lead Wire Installation
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shim_trans  Upgrade Reinforcement
 Introduction
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shim_trans  Analysis of Bravo-25
 Load Response
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shim_trans  Calculation of
 Bravo 25 Resistence
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shim_trans  Modes of Failure
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shim_trans  Bravo 25
 Upgrade Design
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shim_trans  Concrete Surface
 Preparation
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shim_trans  Embedded
 Reinforcement
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shim_trans  Wet Lay-up
 Composite Laminate
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shim_trans  Proof Tests using
 Impact Load Method
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shim_trans  Costs
 Acknowledgements
 References
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Turbine Deck Load Capacity Restored


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Home > Featured Project > Pearl Harbor

Featured Project

 

Cathodic Protection System Installation

Anode Installation. A mesh ribbon of titanium was used with a mixed metal oxide coating as an anode (Figure 31). The ribbon is 1/2 inch (1.25 cm) wide and approximately 0.05 inch (1.2 mm) thick. The contractor embedded the ribbon in a grid pattern in saw cut slots in the bottom surfaces between the curb and the outside pile girder and between the track slabs (Figures 32 and 33). The slots were ¾ inch (2 cm) deep and 3/16 inch (0.5 cm) wide. When drain holes, pipe hangers, or other obstructions were encountered the ribbon slots were shifted to clear the obstructions by at least 1 inch (3 cm). The longitudinal slots were spaced 13 inches (33 cm). Both ends of the anode ribbon terminated at holes the same depth as the slot and approximately 1 inch (3 cm) in diameter where ends of anode was welded to a 1/2-inch (1.25 cm) wide, titanium header ribbon (Figures 34 and 35). The header ribbon was connected to a Number 12 AWG (2.7 mm diameter) lead wire via a mechanical copper fastener and completely sealed with epoxy.

 

The mesh was grouted into place using polymer modified, Sikatop 123 Plus® ensuring the anode was in good electrical contact with the concrete (Figure 36). The objective was to use a grout that was as good an electrical conductor as the surrounding concrete with a maximum resistivity of 25,000 ohm-cm. The anode ribbon was held in place with small wedges (golf tees) or Dow? backer rod until the grout was in place. The contractor had to go back and apply grout to the open lengths after removing the tees and backer rod.

 

NFESC engineers tested all components of the anode installation and found no electrical contact with any metal in the wharf.

 

The lead wire and its connection to the header ribbon was contained in 1 inch (3 cm) polyvinyl chloride (PVC) conduit starting at the point where the header ribbon emerges from the concrete. The conduit ran to the closest transverse girder where it teed into another conduit that ran along the transverse girder at the end of a span (between transverse girders). The latter acted as a common carrier for all anode lead wires from each span. Each span’s conduit proceeded toward the curb under the outboard pile girder where they teed into a 2-inch (5 cm) conduit running longitudinally under the curb deck alongside the pile girders. The 2-inch (5 cm) conduit is a common carrier for all anode lead wires from individual spans. Each conduit tee has a watertight access plate allowing wire connection and inspection. All wire-to-wire connections of leads below deck were solder joints that were sealed. The 2-inch (5 cm) conduit was routed to a junction box for each segment. Conduit was mounted securely by nonmetallic clamps or straps spaced at 6 feet (2 m) intervals.

 

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Figure 31. Titanium mesh, anode ribbon.

 

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Figure 32. Saw cutting grid slots for titanium ribbon anode.

 

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Figure 33. Anode grid slots under the curb slab.

 

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Figure 34. Fitting titanium header ribbon.

 

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Figure 35. Welding header ribbon to anode mesh ribbon

 

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Figure 36. Grouting anode slots with Sikatop 123 Plus©.

 

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ACE Restoration & Waterproofing, Inc.
620 E. Walnut Ave.
Fullerton, CA 92831
714.526.7366
Fax: 714.526.7965

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  ACE Restoration and Waterproofing Quick Service Overview:
  Concrete repair; concrete restoration, structural upgrade, epoxy injection,
  waterproofing, and more concrete technologies in Fullerton California (CA)
  by ACE Restoration and Waterproofing.

  Concrete Repair, Concrete Restoration, Epoxy Injection, Waterproofing

http://www.acerestoration.net/

 

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