REPAIR 450 System

Thixotropic, structural, fibre-reinforced polymer-modified cement mortar, class R4 in accordance with the UNI EN 1504-3 standard, with controlled hygrometric shrinkage,specifically designed for restoration and skim coating of concrete for applications at a thickness of between 5 and 50 mm.

Repair 450 was formulated to ensure the best performance levels in restoration and restructuring work on the most commonly used cement substrates in construction. Repair 450 can be laid in variable thicknesses of between 5 and 50 mm by hand or by machine, efficiently accommodating all the application requirements of construction sites.

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Features

Outstanding wetting and thixotropic properties.
Easy workability
Mechanical strength
High adhesion strength

System Products

Profer 100

Repair 450

Finish PRO 280

Elasto Paint

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BBA certified
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Advantages of Polymer Modification

Polymer-modified cement mortars offer significant advantages over traditional mortars. By incorporating polymers, these mortars exhibit enhanced adhesion, flexibility, and durability, making them ideal for various concrete repair applications. The improved bond strength ensures long-lasting repairs, even in challenging environments.

Additionally, the flexibility imparted by polymers allows the mortar to accommodate substrate movements without cracking. This characteristic is particularly beneficial in exterior applications where temperature fluctuations can cause expansion and contraction. Moreover, the enhanced durability extends the lifespan of repaired structures, reducing the need for frequent maintenance.

Applications of Polymer-Modified Mortars

Polymer-modified mortars are versatile and suitable for both exterior and interior use. They are commonly employed in repairing damaged concrete surfaces, such as spalled areas, cracks, and voids. Their excellent adhesion to various substrates, including steel reinforcement, makes them ideal for structural repairs.

In addition to repairs, these mortars are used in waterproofing applications. For instance, Licata’s Hydro Monoelasto 100 is a single-component, polymer-modified cementitious waterproofing product designed to protect concrete structures from water ingress.

Comparison with Traditional Cement Mortars

Traditional Portland cement mortars, while effective in many scenarios, often lack the flexibility and adhesion required for durable repairs. In contrast, polymer-modified mortars provide superior bond strength and flexibility, ensuring that repairs can withstand structural movements and environmental stresses.

Moreover, the reduced permeability of polymer-modified mortars protects the underlying concrete from water penetration and carbonation, which can lead to deterioration over time. This makes them a more reliable choice for long-term durability in repair applications.

Licata’s Polymer-Modified Mortar Solutions

Licata offers a range of polymer-modified mortars adapted for various repair needs. The Repair 450 is a thixotropic, structural, fibre-reinforced mortar classified as R4 in accordance with UNI EN 1504-3, suitable for applications between 5 and 50 mm thickness.

Another notable product is the Repair 250 N, designed for restoration and protection of concrete structures. It offers high adhesion strength and mechanical performance, making it suitable for a wide range of repair applications.

Technical Specifications and Compliance

Licata’s polymer-modified mortars comply with European standards, ensuring quality and reliability. For example, the Repair 450 meets the requirements of UNI EN 1504-3 for structural repair mortars, classified as R4, indicating high performance in terms of compressive strength and adhesion.

Similarly, the Hydro Monoelasto 100 is certified in accordance with UNI EN 14891 as a waterproof cement mortar, resistant to chlorine and with crack-bridging ability at low temperatures, making it suitable for waterproofing applications.

Incorporating these polymer-modified mortars into your repair projects ensures adherence to industry standards and enhances the longevity and durability of the repaired structures.

Frequently Asked Questions (FAQs)

1. How long does polymer modified cement mortar take to cure?

Our polymer modified cement mortar typically requires 24 to 48 hours for initial curing, though full strength develops over 28 days. The curing time depends on temperature and humidity conditions at your site. In cold weather or high humidity, fresh mortar may take longer to reach optimal compressive strength.

For Licata’s Repair 450 and similar polymer modified mortars, we recommend protecting the repaired surface from direct sunlight and temperature fluctuations during curing. The polymer emulsions and redispersible polymer powder in our formulations actually help reduce moisture loss, which means better curing compared to traditional mortars. This enhanced curing process fills capillary pores more effectively, giving you long lasting repairs.

2. What is the mixing ratio for polymer modified cement mortar?

For our Repair 450 system, mix approximately 5.5 to 6 litres of clean water per 25kg bag of powder. The exact ratio depends on your application method, whether you’re applying by hand or machine. Always add the powder to water gradually while mixing to achieve a smooth, lump-free blend.

The Portland cement base combined with selected aggregates, fine sand, and polymer additives creates the right consistency when mixed properly. We recommend using a low-speed drill mixer for about 3 to 5 minutes until you get a homogeneous paste. Never add extra water to stiffen mix as this compromises the physical properties and durability of the repair mortar.

3. How much coverage does polymer modified cement mortar provide?

Coverage depends on layer thickness and the condition of your damaged concrete substrate. Our Repair 450 provides roughly 1.8 to 2.0 kg per square metre for every millimetre of thickness applied. So for a 10mm application on concrete structures, you’d need about 18 to 20kg per square metre.

The beauty of polymer modified thinset mortar is its versatility for both exterior and interior use. You can apply it from 5mm to 50mm thick to fill voids and restore surface integrity. Rough or heavily damaged concrete will naturally require more material than smooth substrates, so always assess your surface condition before ordering.

4. What is the shelf life of polymer modified cement mortar?

Our polymer modified cement mortar has a shelf life of 12 months from manufacturing date when stored correctly. Keep the packaging sealed and store in a dry, covered area away from moisture and direct contact with concrete or stone surfaces. Once you open a bag, use the materials within a few weeks for best quality.

The redispersible polymer powder and other additives in our formulations are sensitive to humidity, so proper storage is essential. Check the packaging date before use, and if the powder has hardened or clumped, it’s past its usable life. We manufacture fresh batches regularly at our facilities, so your local Licata depot always stocks quality products with maximum shelf life remaining.