FRP REPAIR GUIDES
FRP Repair Guides for Engineers & Owners
Plain answers on FRP, pile, seawall and column repair, including methods, costs and how-tos, from the team that pioneered FRP repair.
What Is FRP? Fiber Reinforced Polymer Explained
FRP (fiber reinforced polymer) is a composite material made of high-strength fibers, usually carbon or glass, embedded in a polymer resin such as epoxy. Thin FRP fabrics, laminates and panels are bonded to beams, columns, walls, piles and pipes to restore or increase their strength without adding significant weight or size.
- typical FRP fabric thickness (1.3 mm)
- 0.05"
- the tensile strength of steel once cured
- 2 to 3×
- FRP is non-metallic, so it does not corrode like steel
- No rust
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Showing 22 guides
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What Is FRP?
FRP (fiber reinforced polymer) is carbon or glass fiber in a resin such as epoxy. How it works, carbon vs. glass, FRP vs. steel, limits and standards.
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Pile Repair Methods
Most damaged piles are repaired in place by encasing the damaged length in a grout-filled jacket. Compare methods for concrete, timber and steel piles.
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Timber Pile Repair Methods
Timber piles are repaired in place by posting, splicing, concrete jackets or FRP shells filled with resin or grout. Compare methods, test results and cost.
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Steel Pipe Pile Repair
Steel pipe piles are repaired by encasing the corroded length in a new shell with a bolted load path. Causes, inspection, options and the no-weld method.
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New Advances in Repair of Submerged Piles
Submerged piles are repaired in place with FRP jackets bonded by epoxy that cures underwater, then grouted. No cofferdam. Methods, steps, costs and tests.
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Beach House & Condo Piling Repair
Damaged beach house and condo piles can often be repaired in place with a jacket and grout. Signs, repair steps by pile type, DIY, permits and insurance.
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Beach House Piling Repair Cost Calculator
Estimate beach house and condo piling repair cost: a PileMedic® material calculator, what drives the price, repair vs. replace, financing and insurance.
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Beach House & Condo Piling Types
Most beach houses stand on treated wood piles. Compare wood, concrete, steel and composite piles, how deep they go, how to choose, and signs of damage.
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Advantages and Disadvantages of Timber Piles
Timber piles are low cost and easy to drive and cut, but carry less load, are hard to splice and decay above the water table. Loads, sizes, service life.
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Timber vs. Concrete Piles
Timber piles cost less and carry 35 to 150 kips; precast concrete piles carry 100 to 250 kips but cost more. Compare length, durability and repair.
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Repair of Bridge Piles in a Crocodile-Infested River
Case study: 40 ASR-cracked bridge piles in a crocodile river, encased underwater in 5 weeks for A$0.95M, about 61% less than the concrete encasement bid.
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What Is a Seawall?
A seawall is a wall along the shore that stops waves and tides from eroding the land behind it. See seawall types, how they work, why they fail and repair.
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Seawall Repair Cost
Seawall repair costs $100 to $250 per linear foot for most walls. See cost by repair type, what drives the price, repair vs. replace, and how to estimate yours.
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An Economical Solution for Seawall and Bulkhead Repair
Repair corroded seawalls and bulkheads in place with FRP panels and grout, with no cofferdam or underwater welding. Methods compared, plus a 926 ft case.
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Rising Sea Levels and Seawalls
NOAA expects U.S. coastal sea levels to rise 10 to 12 in. on average by 2050. See regional numbers, tide gauge trends, flood risk and how to raise a wall.
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Environmental Permitting for Marine Repairs
Seawall repairs in U.S. waters usually involve the Army Corps of Engineers. How federal permits work and what to document for a low-impact repair.
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How to Repair a Damaged Steel Column
Repair a corroded or damaged steel column without welding: measure section loss, add bars and shear clamps, wrap an FRP jacket and grout it. 11 steps.
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Steel Column Repair Methods
Steel column repair methods compared: coatings, welded plates, collars, concrete jackets, FRP wraps and concrete-filled FRP jackets, and when to use each.
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Steel Column Repair Cost
Estimate a steel column FRP jacket per linear foot, then see what drives repair cost: section loss, size, access, outages, method and repair vs. replace.
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An Economical Solution for Strengthening Concrete Columns
Strengthen weak or corroded concrete columns with a grout-filled FRP laminate shell: 51% to 80% more axial capacity and twice the flexure in an example.
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Repair of Corrosion-Damaged Substation Structures
How nearly sixty corroded steel substation structures were repaired with grout-filled FRP laminate jackets while the substations stayed energized.
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Preventing Failure of Earth Dams by Overtopping
Overtopping causes about 34% of U.S. dam failures. Why earth dams overtop, how engineers prevent it, and a proposed FRP panel crest raise of up to 10 ft.
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