Sikadur®-30 Epoxy Adhesive | Professional Solution for Structural Strengthening

What is Sikadur®-30? | Thixotropic Epoxy Adhesive for Structural Strengthening

Sikadur®-30 is a high-performance structural adhesive developed for professional strengthening applications. It is a two-component, thixotropic epoxy resin system containing special fillers.

Manufactured by Sika, this product can be safely applied between +8 °C and +35 °C and is especially preferred for bonding carbon fiber plates to concrete, brick, and wooden surfaces.

In structural strengthening projects, Sikadur®-30 provides a strong bond between carbon fiber or steel plates and the substrate, ensuring high safety, durability, and long service life.

Application Areas

1. Structural Strengthening Applications

Sikadur®-30 is widely used for:

• Bonding carbon fiber plates to concrete surfaces
• Fixing steel plates onto concrete structures
• Epoxy bonding adhesive for near-surface mounted (NSM) reinforcement systems

2. Reinforcement of Reinforced Concrete Elements

Suitable applications include:

• Strengthening of beams, columns, slabs, and shear walls
• Bonding agent in externally bonded reinforcement systems
• Adhesive solution for NSM strengthening applications

3. Bonding Different Materials

Provides strong adhesion on various surfaces such as:

• Wood
• Steel
• Aluminum
• Cast iron
• Brick
• Natural stone surfaces

Technical Advantages

Sikadur®-30 offers several performance advantages:

• Easy mixing and application
• No primer required in many applications
• Thixotropic structure prevents sagging on vertical and overhead surfaces
• Strong adhesion to concrete, metal, wood, and carbon fiber plates
• Hardens without shrinkage
• Provides high initial and final strength
• Resistant to water and water vapor penetration
• Reliable performance under high humidity conditions
• High abrasion and impact resistance
• Easy mixing control thanks to different-colored components

Technical Properties

Chemical Structure

• Epoxy resin

Packaging

• 6 kg A+B set
• 30 kg Component A / 10 kg Component B industrial packaging

Colors

• Component A: White
• Component B: Black
• Mixed material: Light grey

Density

• 1.65 kg/L ± 0.1 (mixed material at 23 °C)

Storage Conditions

• Between +5 °C and +30 °C in a dry environment

Shelf Life

• 24 months in original unopened packaging

Strength Performance Values

According to technical performance data:

Compressive Strength (EN 196)

• 12 hours: ~55–85 N/mm²
• 1 day: ~70–90 N/mm²
• 3 days: ~75–90 N/mm²
• 7 days: ~90 N/mm²

Additional Performance Values

• Tensile adhesion strength: > 4 N/mm² (concrete failure)
• Shear strength: > 21 N/mm² (23 °C)
• Thermal expansion coefficient: 2.5 × 10⁻⁵ /°C
• Service temperature: –40 °C to +45 °C

Application Information

Mixing Ratio

• A : B = 3 : 1 (by weight or volume)

Maximum Application Thickness

• Up to 30 mm

Vertical Surface Performance

At +35 °C:

• No sagging up to 3–5 mm thickness

Pot Life

The working time varies according to temperature:

• +8 °C → approximately 150 minutes
• +20 °C → approximately 110 minutes
• +35 °C → approximately 50 minutes

Surface Requirements

Before application, the surface must be:

• Clean
• Strong
• Dry
• Free from dust, oil, and weak particles

Additional requirements:

• Surface temperature must be at least +3 °C above the dew point.
• Moisture content should not exceed 4%.

Application Steps

1. Prepare the surface by removing weak materials and contaminants.
2. Mix Components A and B at low speed for at least 3 minutes.
3. Continue mixing until a homogeneous light grey color is achieved.
4. Transfer the mixture into a clean container and mix again.
5. Apply the adhesive using a spatula or trowel.
6. Press and position the carbon fiber or steel plate firmly onto the surface.
7. Clean tools immediately with a suitable cleaner.

Role in Structural Applications

Sikadur®-30 is commonly used in:

• Reinforcement of reinforced concrete structures
• Carbon fiber plate strengthening systems
• Steel plate bonding applications
• NSM reinforcement systems
• Load-bearing structural bonding applications

With these features, Sikadur®-30 is considered a reliable epoxy adhesive solution for demanding engineering and strengthening projects.

Frequently Asked Questions (FAQ)

At what temperatures can Sikadur®-30 be applied?

It can be applied between +8 °C and +35 °C.

Which surfaces does it bond to?

It provides strong adhesion to:

• Concrete
• Steel
• Aluminum
• Cast iron
• Wood
• Brick
• Carbon fiber plates

What is the mixing ratio?

The mixing ratio is A : B = 3 : 1.

Does it sag on vertical surfaces?

No. Thanks to its thixotropic structure, it maintains stability without sagging on vertical and overhead surfaces.

What is the shelf life?

The shelf life is 24 months when stored in its original unopened packaging under suitable conditions.