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Sikalastic®-1K: A Concrete Repair Solution

Updated: 9 December 2025

Concrete may crack for many reasons, including excess water in the mix, shrinkage during drying or expansion caused by environmental conditions. While cracks can look concerning, they are common and can be repaired effectively with the right materials.

One reliable repair and waterproofing solution is Sikalastic-1k, a fibre reinforced mortar designed to bridge cracks and protect concrete surfaces.

Table of Contents

Why Concrete Cracks Occur

Concrete cracking can happen for various reasons, such as:

  • Excess water added to the concrete mix.

  • Shrinkage as concrete dries.

  • Thermal expansion or environmental movement.

Regardless of the cause, most cracks can be repaired effectively with the right materials and methods.

What Is Sikalastic-1K?

Sikalastic-1K is a one component, crack bridging, fibre reinforced mortar based on cement modified with special alkali resistant polymers. It serves as both a protective coating and a waterproofing solution.

In addition to repairing cracks, Sikalastic-1K forms a waterproof membrane that protects concrete surfaces from moisture intrusion.

The product meets multiple approvals and certifications, including suitability for contact with drinking water.

Key Features and Composition

Sikalastic-1K contains:

  • Cement modified with alkali resistant polymers.

  • Selected aggregates and fine fillers.

  • Performance enhancing admixtures and additives.

  • Reinforcing fibres.

Only water needs to be added during preparation, making the system simple and efficient to use.

How to Apply Sikalastic-1K

Sikalastic-1K can be applied using a brush or trowel. Before application, ensure the substrate is structurally sound, clean, dry and free from contaminants such as oils, loose coatings or laitance.

Like many cement based products, setting time may be affected by high humidity. Adequate ventilation is recommended during curing.

Additional Notes

Sikalastic-1K is effective for structural protection, crack repair and waterproofing in a wide range of concrete applications. Its safe, certified formulation makes it suitable for use in sensitive environments, including potable water facilities.

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