Structural strengthening with external carbon fiber reinforcement

Technology, work stages, and advantages

Why reinforce columns with carbon fiber?

Reinforced concrete and metal columns lose their load-bearing capacity over time due to:

✔ Reinforcement corrosion

✔ Cracking

✔ Increased loads

✔ Construction design errors

External carbon fiber reinforcement restores up to 95% of the structural strength without altering the geometry or halting operations.

Carbon fiber column reinforcement techniques

Horizontal reinforcement
- Uni- or bi-directional woven tapes/webs.
- Winding pitch is determined by design loads.
Vertical Reinforcement
- Carbon fiber lamellas supported by rounded corners.
- Fiber orientation aligns with the column axis.
Combined Reinforcement
- Integrates both horizontal and vertical carbon fiber layers.
- Optimal for columns subjected to complex loading conditions.

Work stages

Diagnostics
- Analysis of destructive factors.
- Damage mapping.
- Load calculation.
- Temporary column unloading (if required).
Surface Preparation
- Removing dust, rust, and deteriorated concrete.
- Filling cracks and defective areas with repair mortars (injection for up to 5 mm, standard mortars for larger areas).
- Rounding of corners (to mitigate local stress concentrations).
Carbon Fiber Application
- Surface priming.
- Bonding of tapes/lamellas with epoxy adhesive, followed by rolling.
- Multilayer reinforcement (according to the calculation scheme).
Finishing treatment
- Curing until full polymerization (min. 48 hours).
- Decorative finishing (if specified).

❗ Operational conditions:

Air and column temperature must be - at least +5° C..
Concrete surface moisture content must - not exceed 4%..

Advantages of the technology

✅ Does not add weight to the structure.

✅ No welding or heavy equipment required.

✅ Minimal lead times (starting from 2 days).

✅ Uninterrupted production.

✅ Durability (50+ years).

Why is it important to entrust the work to professionals?

Reinforcement calculations must adhere to SNiP 52-01 and SP 63.13330 standards.
Installation errors can reduce facility efficiency and safety by 40–50%..
An acceptance certificateis essential for documenting changes with construction supervision.

📞 Order carbon fiber column reinforcement with a guarantee!

On-site engineer inspection.
Reinforcement design compliant with all standards.
Certified materials.

How we check the quality of strengthening

Tap test. After curing we tap the whole bonded surface: a dull sound shows voids under the wrap, and those spots are re-bonded.
Bond to concrete. We test bond strength on control areas — it decides whether the carbon fibre works together with the column.
As-built drawing. We hand over an as-built drawing of the strengthening with the number and position of layers.

Carbon fibre needs fire protection

The epoxy adhesive that holds the carbon fibre loses strength when heated — and the strengthening stops working. So on facilities with fire safety requirements strengthened members are covered with fire protection. We do both the strengthening and the fire protection — you do not need a second contractor.

Over 20 years of experience, our own crews, ISO 9001 and ISO 45001 certified. We work across Uzbekistan.