Epoxy-based reinforcement systems, when used in combination with carbon or glass fiber-reinforced polymers, provide an effective solution for enhancing the structural performance of concrete, brick, stone, and timber surfaces. However, the high strength and durability offered by these systems are not solely dependent on product quality; they are directly linked to the technical accuracy of the application process. Inadequate surface preparation or application errors can significantly reduce the overall performance of the system.

In this article, we will discuss why proper application of epoxy-based systems is critical, how application errors can be prevented and the key considerations for achieving maximum performance from CARBOFİX systems.

Mechanism of Epoxy Systems

Epoxy resins are two-component (A+B) thermosetting polymer systems. After application, they cure through a chemical reaction, harden and create a strong bond between the fiber fabrics and the substrate, ensuring structural integrity. The success of this system depends on the following factors:

• High adhesion between the epoxy and the substrate
• Perfect interlayer bonding
• Prevention of improper curing processes

1. Importance of Surface Preparation

In epoxy-based systems, surface preparation is the primary determinant of performance. The substrate must be capable of forming both physical and chemical bonds with the epoxy.

Surface Preparation Steps:

Cleaning: Oil, dirt, paint, salts, and formwork residues must be completely removed.

Mechanical Roughening: Concrete, stone, or timber surfaces should be mechanically roughened at a micro level using grinding or sandblasting.

Moisture Control: Moist surfaces prevent proper curing of epoxy. A maximum moisture content of 4% is recommended.

Dust Removal: Residual dust after surface roughening must be removed using an industrial vacuum system.

 

Tip: If water droplets bead up on the surface, epoxy adhesion will be low. This simple test can be used to assess surface suitability.

2. Epoxy Application Techniques

Mixing Ratio

In two-component epoxy systems (A+B), the mixing ratio must strictly comply with the manufacturer’s instructions (e.g., 2:1). Improper or approximate mixing can lead to curing issues.

Mixing Time

Components should be mixed with a low-speed mixer for 2–3 minutes until a homogeneous consistency is achieved. Insufficient mixing may result in incomplete curing and a tacky surface.

Application Timing

An epoxy resin must be applied within its pot life (working time). Higher temperatures significantly reduce this duration. Delayed application can lead to loss of adhesion on the surface.

Application Method

• Epoxy is first applied to the substrate using a brush or roller.
• It is then applied over the carbon fabric and distributed evenly.
• To eliminate air entrapment, the system should be pressed using a spatula or roller.

3. Common Application Errors and Recommended Solutions

Error	Causes	Solution
Epoksi katmanın soyulması	Inadequate surface preparation	Verify surface preparation with both mechanical and chemical checks
Kürlenme tamamlanmaması	Incorrect mixing ratio, low temperature	Ensure ambient temperature ≥ 10°C and strictly follow mixing ratios
Hava boşlukları oluşması	Insufficient consolidation	Use rollers for proper consolidation and heat guns for air release
Katman ayrılması	Time gaps between layers, contamination	Apply subsequent layers within the specified curing interval and ensure clean surfaces

 

4. Application Environment Conditions

Temperature: Should be between +10°C and +35°C.
Relative Humidity: Recommended to be below 80%.
Wind and Direct Sunlight: In outdoor applications, the area should be protected with appropriate coverings.

REPOX epoxy products offer a range of formulations specifically designed to accommodate different ambient temperature conditions.

5. Experience and Training

The CARBOFİX technical service team provides both on-site and theoretical training to applicators. Because even the highest-quality product can only deliver optimal performance when applied with the correct technical knowledge.

The Power of Precision in System Performance

Epoxy-based reinforcement systems, when combined with advanced materials such as carbon fiber, deliver exceptional performance. However, the success of these systems depends on proper surface preparation, accurate mixing ratios, correct timing and meticulous application.

CARBOFİX not only offers high-quality epoxy systems but also provides application support services to ensure maximum efficiency on-site. For structural reinforcement projects, sustainable, reliable and aesthetically sound solutions can only be achieved by combining the right materials with the right techniques.

For more information and quotations, please contact us at +44 (0) 2081760680 or via email at info@fixaco.uk