Ground anchors and structural reinforcements might be buried, but they’re never out of danger. In aggressive soils, moisture, salts, sulfates, stray currents, and shifting pH levels are constantly testing steel beneath the surface. Over time, these forces can weaken it and reduce load capacity — creating costly problems for owners and contractors. 

For coatings professionals, keeping these components safe starts with understanding the soil and assessing corrosion risk, while matching the protection system to design and installation factors. 

Understanding Soil Corrosivity Before Specifying Coatings

Choosing the right coating begins with a clear picture of the soil. Standard geotechnical reports provide a baseline, but corrosion-focused testing tells you exactly what you’re dealing with. 

Key factors to look at include: 

• Soil resistivity 

• pH levels 

• Chloride and sulfate concentrations 

• Moisture content and drainage 

• Stray electrical currents 

Low-resistivity soils allow electrical currents to move easily, increasing corrosion potential. High chlorides or sulfates accelerate degradation, especially where groundwater fluctuates. Knowing these conditions helps you decide whether a simple coating will work or if you need full encapsulation and double corrosion protection. 

Coating Systems Designed for Subsurface Protection 

Buried anchors aren’t easy to inspect or repair, so the initial coating has to do heavy lifting. It must resist chemical exposure while surviving handling and installation stress.  

Some systems to consider include the following: 

• Fusion-Bonded Epoxy (FBE): FBE provides strong adhesion and chemical resistance. Applied correctly, it keeps corrosion from getting in under the coating and holds up for years. However, in abrasive drilling environments, additional protection may be necessary to prevent mechanical damage during installation. 

• Coal Tar Epoxy Systems: Where permitted, coal tar epoxy systems have historically been used in industrial, marine-adjacent, or sulfate-heavy soils due to their moisture resistance and durability. However, environmental regulations in some regions have limited their use. 

• Polyurethane and Polyurea Coatings: These coatings offer flexibility and resist abrasion — important features that matter most when anchors are being handled or inserted. Even slight soil movement won’t crack or peel them. 

• Petrolatum Tape Wraps: Petrolatum wraps act as a secondary barrier, molding to irregular shapes. Paired with primers or primary coatings, they form a multilayer system that adds redundancy and long-term reliability. 

Multilayer systems are common for critical projects. Combining bonded coatings with grout encapsulation, HDPE sheathing, built-in corrosion allowances, or sacrificial anodes ensures the steel stays protected — even if one layer becomes compromised. 

Encapsulation Levels and Design Life Considerations 

Protection needs to match the anchor’s expected service life. Temporary shoring anchors may only need a simple barrier, while permanent anchors for bridges, retaining walls, slope stabilization, and similar projects, require more robust systems. 

Double corrosion protection is often used for long-term installations: a bonded coating with grout or sheathing creates two independent barriers. In aggressive soils, thicker coatings or sealed anchor heads also provide extra security. 

Collaborating early with engineers and geotechnical consultants ensures specifications reflect real exposure. 

Application Challenges in the Field 

Even top-quality coatings can fail due to improper installation. Anchors face abrasion in certain conditions: transport, drilling, insertion. Scratches, uneven film, poor surface prep, and other kinds of coating damage can affect protection — and once the steel is buried, it’s more difficult to repair it. 

Field protocols should include:  

• Holiday testing 

• Thickness verification 

• Visual inspections 

• Adhesion testing 

• Proper sealing at joints and anchor heads 

• Documented touch-ups and repairs 

Coordination is also key on projects involving full-depth reclamation contractors to avoid accidental damage during backfilling or compaction. 

Long-Term Performance in Aggressive Soil Environments 

Durable performance comes from a comprehensive approach, rather than a single product. Effective systems typically include: 

• Redundant corrosion barriers 

• Controlled shop application when possible 

• Verified field repairs and inspections 

• Proper grout selection and placement 

• Documentation for long-term asset management 

Groundwater movement, freeze-thaw cycles, shifting soil constantly test buried steel. Flexible, well-adhered coatings help prevent cracking or disbonding, and in severe conditions, cathodic protection adds another layer of security. 

Building Durability From the Ground Up 

Ground anchors and reinforcements support critical infrastructure. And their longevity depends on thinking ahead: every coating layer, every inspection, every touch-up makes a difference. 

Planning carefully and staying vigilant during installation allows coatings professionals to turn potential corrosion problems into long-term performance. Anchors endure aggressive soils and inspections stay manageable, while repairs become rare — delivering reliable structures that stand the test of time. 

AUTHOR BIO: Mike Cohn is Vice President at Rock Solid Stabilization & Reclamation, Inc., a leader in sustainable reconstruction specializing in soil modification and pavement preservation. With over 25 years of experience in the stabilization industry, Mike is recognized as a thought leader focused on advancing best practices and promoting sustainability. He drives operational excellence while leveraging digital content and social media to educate the market and strengthen partnerships with clients and vendors. 

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