SikaGrout®-928 (MasterFlow 928) | High Strength Non-Shrink Cementitious Grout Mortar

What is SikaGrout®-928?

SikaGrout®-928 is a single-component, cement-based, high-strength, non-shrink grout mortar designed for structural grouting applications requiring high load transfer capacity, excellent flowability, and strong adhesion.

When mixed with water, the product reaches a fluid consistency, allowing easy application by both manual and mechanical methods. It is specially formulated to provide high flow without segregation or bleeding, ensuring complete filling of voids and reliable structural performance.

The product is developed by Sika, a globally recognized manufacturer in construction chemicals.

For more product details and technical information, the relevant pages on the Bozaltınay website can be reviewed.

Application Areas

SikaGrout®-928 is widely used in applications where precise leveling, strong support, and load transfer are required.

Main application areas include:

• Machine foundations
• Steel base plates
• Crane rails
• High-bay storage systems
• Turbines, pumps, generators, and similar equipment installations
• Precision equipment leveling and mounting applications
• Prefabricated column installations
• Structural void filling applications
• Stud and reinforcement anchoring applications

The product is especially suitable for projects requiring high strength, dimensional stability, and complete void-free filling.

Technical Properties

According to the manufacturer’s technical data, the main performance characteristics are:

• Compressive strength: ≥ 60 MPa (28 days, +21 °C)
• Elastic modulus: ≥ 20,000 MPa
• Pull-off adhesion strength: ≥ 2.0 MPa
• Chloride content: ≤ 0.05%
• Fresh mortar density: Approximately 2.2 kg/L
• Standards compliance: EN 1504-3 (structural repair mortar) and EN 1504-6 (anchoring product)

Thanks to its controlled expansion properties, SikaGrout®-928 provides complete filling without shrinkage and offers resistance against carbonation comparable to reference concrete.

Mixing, Consumption, and Application Conditions

For a 25 kg bag of SikaGrout®-928:

• Approximately 4.0 liters of water are required.
• Approximately 12–13 liters of grout mortar are obtained.

Application thickness:

• Minimum: 10 mm
• Maximum: 80 mm

Application conditions:

• Product and ambient temperature: +5 °C to +30 °C
• Pot life: Approximately 45 minutes
• Initial setting time: 140–200 minutes
• Formwork removal time: 18–24 hours

Key Advantages

SikaGrout®-928 provides several important performance benefits:

• Non-shrink structure with controlled expansion
• High flowability without segregation
• High early and final strength development
• Strong adhesion and water resistance
• Resistance against freeze-thaw cycles and de-icing salts
• Void-free filling that helps reduce vibration-related issues in machinery applications
• Reliable load transfer performance

Packaging and Storage

The product is supplied in:

• 25 kg grey powder kraft bags

Storage conditions:

• Store in a dry environment
• Storage temperature: +5 °C to +30 °C
• Shelf life: 12 months in original unopened packaging

The product should be protected from direct sunlight and freezing conditions.

Basic Application Steps

Surface Preparation

The surface must be:

• Cleaned from oil, dust, and loose particles
• Saturated but free from standing water before application

Proper surface preparation is essential for achieving maximum adhesion and durability.

Mixing

• Mix mechanically until a homogeneous consistency is achieved.
• Do not add additional water after mixing.
• Follow the recommended water ratio for optimum performance.

Application

• Pour the grout continuously from one side to prevent air entrapment.
• Do not use vibration during placement.
• After application, keep the surface moist to ensure proper curing.

Frequently Asked Questions (FAQ)

What thickness can SikaGrout®-928 be applied at?

It can be applied between 10 mm and 80 mm thickness.

How much grout is obtained from one bag?

A 25 kg bag produces approximately 12–13 liters of grout mortar.

What is the pot life of the product?

The pot life is approximately 45 minutes, depending on temperature conditions.

Can additional water be added after mixing?

No. Additional water should not be added as it may negatively affect the final performance.

What is the compressive strength of SikaGrout®-928?

The compressive strength is ≥ 60 MPa after 28 days at +21 °C.

Which standards does it comply with?

SikaGrout®-928 complies with:

• EN 1504-3 – Structural repair mortar
• EN 1504-6 – Anchoring products