Structural Concrete Repair Mortar — Class R3

Repair 250 N — Structural Concrete Repair Mortar

Thixotropic, structural, fibre-reinforced polymer-modified cement mortar — classified R3 to UNI EN 1504-3 and certified to UNI EN 1504-2, for concrete repair at 3–30mm

Repair 250 N is Licata's thixotropic, polymer-modified structural repair mortar — manufactured with high-resistance hydraulic binders, selected aggregates, special additives and HT fibres. Designed for the reconstruction, protection and skim coating of concrete at variable thicknesses from 3 to 30mm, it delivers superior adhesion, excellent mechanical strength, and controlled hygrometric shrinkage that minimises cracking and peeling throughout the service life of the repair.

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Certified UNI EN 1504-3 — Class R3 UNI EN 1504-2 — Principle 1.3 (C) Compressive Strength > 25 MPa Adhesion > 1.5 MPa Fire Euroclass A1

Classification R3 — Structural

Application Thickness 3–30mm per coat

Consumption 17.5 kg/m² per 10mm

Working Time at 20°C ≈ 40 minutes

Temperature Range +5°C to +35°C

Features & Benefits

Why specify Repair 250 N structural concrete repair mortar?

Classified R3 — UNI EN 1504-3

Repair 250 N fully meets the bending strength and compressive resistance requirements for Class R3 under UNI EN 1504-3, achieving compressive strength exceeding 25 MPa and an elastic modulus above 15 GPa — satisfying the most demanding structural repair specifications.

Carbonation Protection — UNI EN 1504-2

Repair 250 N prevents atmospheric CO₂ from penetrating into the substrate, protecting the underlying concrete against carbonation in compliance with UNI EN 1504-2 Principle 1.3 (C). Capillary absorption is confirmed at ≤0.075 kg/m²h½.

Superior Adhesion Strength

As a polymer-modified mortar (PCC), Repair 250 N achieves adhesion exceeding 1.5 MPa and maintains that bond after frost cycles, heat exposure, thundershower simulation and chemical aggression — proof of long-term reliability in harsh environments.

HT Fibre Reinforced

High-tenacity fibres are incorporated throughout the mix, providing continuous reinforcement that increases flexural strength and, combined with the controlled-shrinkage formula, minimises the formation of cracks, fissures and peeling in the completed repair.

Thixotropic — Vertical & Overhead

Special additives deliver excellent thixotropy and wetting capacity, making Repair 250 N equally suited to vertical surfaces, soffits and overhead applications. It holds position immediately on application and will not slump under its own weight.

3–30mm in a Single Coat

Repair 250 N can be applied by hand or by machine in a single coat from 3 to 30mm — efficiently accommodating the full range of structural repair depths without the need for multiple thin build-up coats in most situations.

Product Description

Repair 250 N — Polymer-Modified Structural Repair Mortar

Repair 250 N is Licata's thixotropic, structural, fibre-reinforced polymer-modified cement mortar — developed in the Licata R&D laboratories from high-resistance hydraulic binders, selected aggregates, pozzolanic additives and HT fibres. It is specifically designed for the reconstruction, protection and skim coating of concrete in structural repair applications.

With a maximum particle size of under 1.5mm and a finish quality that accepts paint or decorative treatments without further working, Repair 250 N delivers both structural performance and a consistently high aesthetic standard. It can be applied by hand or machine from 3 to 30mm in a single coat — and to greater depths by applying a second coat onto a fully hardened first.

Repair 250 N develops full resistance after 28 days of curing and can be levelled with a trowel at 80–120 minutes and overcoated or painted from 24 hours. It is fully compatible with BetonFIP Passivante as a primer coat on exposed reinforcement bars and with FinishPro 280 as a final skim coat layer.

Certifications

UNI EN 1504-3 — Class R3 · UNI EN 1504-2 — Principle 1.3 (C) · Compressive strength >25 MPa · Adhesion >1.5 MPa · Fire Euroclass A1

Applications

Where to use Repair 250 N

Structural concrete repair — exposed reinforcement

Carbonation protection of reinforced concrete

Local repairs to cement-based flooring

Balcony risers, corners, damaged edges and gutters

Reconstruction of spalled or deteriorated concrete sections

Cementitious infrastructure — bridges, car parks, industrial

For application on substrates not listed above, contact our technical team for guidance on suitability.

Technical Data

Repair 250 N — technical specification

AppearanceGrey powder

Particle size< 1.5mm

Consumption17.5 kg/m² per 10mm

Mixing water per 25kg4.0–4.5 L (16–18%)

Working time at 20°C≈ 40 minutes

Thickness per coat3–30mm

Levelling time at 20°C80–120 minutes

Paintable from24 hours

Full strength at 28 days28 days curing

Application temperature+5°C to +35°C

Density1,950–2,050 kg/dm³

Mix pH≈ 12

Packaging25kg bags

Shelf life12 months (sealed, dry store)

Compressive strength (EN 12190)> 25 MPa

Adhesion strength (EN 1542)> 1.5 MPa

Elastic modulus (EN 13412)> 15 GPa

Linear shrinkage (EN 12617-1)< 0.05%

Chloride ion content (EN 1015-17)< 0.003%

Reaction to fireEuroclass A1

Preparation & Mixing

Preparing Repair 250 N

Substrate preparation: Mechanically remove all flaking or easily detachable material. Clean the area thoroughly — free from dust, detergents, oils, greases, waxes, gypsum and salts. For exposed reinforcement, apply BetonFIP Passivante before proceeding.

Mixing: Add 4.0–4.5 litres of clean water per 25kg bag (16–18% by mass). Pour the product into a container with ¾ of the water and mix for 3 minutes at low speed, gradually adding the remaining water until a homogeneous, lump-free thixotropic mixture is achieved. Do not split bags for partial mixes.

Substrate condition: Prior to application, wet the prepared substrate with water until saturated so that it is in a Saturated Surface Dry (SSD) condition. This is essential for proper bonding and prevents the substrate from drawing water out of the fresh mortar.

Application

Applying Repair 250 N

Bonding layer: Apply a thinner, well-pressed bonding coat first before building to the required thickness. Even out with a trowel, compacting as necessary.

Single coat depth: Repair 250 N can be applied in a single coat from 3 to 30mm by hand or machine. For repairs exceeding 30mm, apply a second coat onto the fully hardened first coat.

Levelling and finishing: The repair can be levelled with a trowel at 80–120 minutes after application. Paint or decorative treatments can be applied from 24 hours. Full structural resistance is achieved after 28 days of curing.

Curing: Protect fresh mortar for at least 24 hours from rapid drying, direct sunlight, strong wind and heavy rain. Do not add water or additional powder to already-mixed product.

Note: Do not apply to substrates with a film of water on the surface, completely dry substrates, walls exposed to direct midday sun, or frozen surfaces. Ambient, substrate and product temperatures must all be between +5°C and +35°C throughout application.

Buy Repair 250 N structural concrete repair mortar

Available from all six Licata branches across the UK. Speak to our team about pricing and technical support.

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