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Mapegrout T40 is a pre-mixed, medium-strength concrete repair mortar designed for predictable, professional results. As a Class R3 structural mortar compliant with EN 1504-3, it provides a high-performance solution for repairing degraded concrete on vertical and horizontal surfaces. Its thixotropic, fibre-reinforced formula can be applied by trowel or spray up to 35 mm thick without slumping, making it the smart choice for overhead and vertical work like balconies, pillars, and tunnels. This shrinkage-compensated mortar ensures excellent adhesion and a waterproof, durable finish, removing the risk of costly callbacks and delivering a job done right.
Potential Outcome: Poor adhesion or complete delamination. The mortar's expansive properties can push it off a smooth surface.
Mapei Best Practice: Always remove loose concrete and roughen the substrate thoroughly. For thicknesses over 2 cm, ensure the surface is reinforced. A solid, rough substrate is critical for predictable performance.
Potential Outcome: Rust continues to grow under the new repair, cracking the mortar from within and causing the spalling to return. This is a guaranteed callback.
Mapei Best Practice: Sandblast all rebar until free of rust. Apply Mapefer or Mapefer 1K to the steel before applying Mapegrout T40. This passivates the steel and ensures a permanent, integrated repair.
Repairing spalling concrete on a balcony edge or beam. The repair is vertical and overhead, needs to be structural, and must be done efficiently without complex formwork.
Mapegrout T40 is purpose-built for this. Its thixotropic nature means you can trowel-apply up to 35 mm directly overhead with no slump. After prepping the substrate and treating the rebar with Mapefer, apply the mortar to rebuild the original profile. You get 40 MPa strength in a product that's easy to work, letting you complete the repair first-time-right. Success means a fast, compliant repair and a happy client.
Ensure the concrete substrate is saturated with water, but with no standing water (Saturated Surface Dry - SSD). This prevents the concrete from "sucking" the moisture from the mortar too quickly and ensures maximum bond strength.
Specifying a compliant, reliable mortar for repairing concrete structures like tunnels, canals, or pillars that meets EN 1504 standards and is suitable for contact with potable water.
Mapegrout T40 removes the guesswork. It is a certified EN 1504-3 Class R3 structural mortar and also meets AS/NZS 4020:2005 for potable water use. Its physical properties (elastic modulus, thermal expansion) are designed to be similar to medium-quality concrete, ensuring compatibility and monolithic performance. Success means your specification is backed by certified data, mitigating risk for the asset owner.
For optimal curing and shrinkage reduction in open-air environments, specify the addition of 0.25% Mapecure SRA to the mix. This additive acts as an internal curing agent, reducing the risk of cracking.
Mapegrout T40 is designed for R3 structural concrete repairs requiring medium mechanical performance, such as repairing degraded vertical or overhead surfaces. It provides 40 MPa compressive strength after 28 days and meets EN 1504-3 R3 standards, ensuring reliability for structural applications.
Yes, Mapegrout T40 is a thixotropic mortar that can be applied by trowel or spray in thicknesses up to 30 to 35 mm per layer on vertical and overhead surfaces without formwork. This capability simplifies repairs in challenging locations like balcony edges or beam corners.
Before applying Mapegrout T40, all degraded concrete must be removed, and reinforcing bars must be sandblasted clean of rust. Rebar must then be treated with Mapefer or Mapefer 1K for corrosion protection to ensure proper adhesion and long-term durability of the repair.
No. Mapegrout T40 is not for structures under high compressive loads, impact, or abrasion; use Mapegrout Thixotropic or Mapegrout T60 for those. It is also not for anchoring or for pumping into formwork. Always ensure the concrete surface is thoroughly roughened before application.
| Application | Key benefit | Primary trades |
|---|---|---|
| Repair of degraded concrete elements like pillars, beams, and balcony corners | Restores structural integrity with 40 MPa compressive strength, meeting EN 1504-3 R3 for structural repair. | Concrete restorers, structural engineers |
| Reconstruction of concrete covering for rusted reinforcing bars | Provides a durable, shrinkage-compensated repair that adheres strongly to treated rebar, preventing future corrosion. | Civil contractors, heritage restorers |
| Repairs to diaphragms, tunnels, and hydraulic structures | Offers waterproof, R3-compliant repair material that can be spray applied for efficient coverage and meets AS/NZS 4020 for potable water contact. | Civil engineers, infrastructure maintenance |
| Filling rigid joints and surface irregularities on concrete | Forms an easy-to-apply thixotropic mortar that holds without formwork, ideal for precise infill and surface restoration. | Builders, facade specialists |
Prepare the mix using a low-speed mechanical mixer. Do not mix by hand.
Trowel Application: Use 3.8 to 4.0 litres of clean water. Spray Application: Use 3.9 to 4.1 litres of clean water.
Add the required water to the mixer first. Slowly add the 25 kg bag of Mapegrout T40 while mixing. Mix for 1-2 minutes, scrape down the sides and bottom of the mixer, and then mix for another 2-3 minutes until a completely homogenous, thixotropic paste is formed.
Apply the mortar to the prepared, Saturated Surface Dry (SSD) substrate.
Apply with a trowel or gauging trowel. The thixotropic mix allows application on vertical surfaces or ceilings in thicknesses up to 30-35 mm per layer without formwork.
Spray apply using suitable equipment (e.g., Turbosol, Putzmeister). This is ideal for large vertical surface repairs.
Proper curing is critical to prevent surface cracks from rapid water evaporation, especially in hot or windy conditions.
Spray water on the surface 8-12 hours after application. Repeat this process every 3-4 hours for at least the first 48 hours.
Alternatively, apply a curing compound like Mapecure E, Mapecure S, or Elastocolor Primer with a low-pressure pump after tamping the mortar.
Danger: Causes skin irritation. May cause an allergic skin reaction. Causes serious eye damage. May cause respiratory irritation.
Wear close fitting safety goggles; do not use eye lenses. Wear clothing that provides comprehensive skin protection, such as cotton, rubber, PVC, or viton. Use protective gloves, with nitrile gloves (1.3 mm, 480 min breakthrough) suggested, or polychloroprene, butyl rubber, or fluorinated rubber options.
Use only outdoors or in a well-ventilated area. Use localized ventilation system to avoid inhalation of dusts and mists.
Store in a well-ventilated place, keeping the container tightly closed. Keep away from food, drink, and feed. Dispose of contents and containers in accordance with applicable regulations. Do not allow product to enter drains or waterways.
Proper substrate preparation is critical for Mapegrout T40 to achieve its documented mechanical strengths and adhesion, preventing premature failure of the repair.
Surface prep: Remove all degraded and loose concrete until a solid, resistant, and rough substrate is exposed. Any previous repair materials that are not fully bonded must be removed. Sandblast the concrete and any reinforcing bars to remove dirt, rust, cement laitance, grease, oil, varnish, or old paint. Saturate the concrete with water, then wait for excess water to evaporate. Use compressed air if needed to eliminate free water before application.
Primer: Not required for the concrete itself. However, reinforcing bars must be treated with Mapefer or Mapefer 1K before Mapegrout T40 application to prevent corrosion and ensure bond.
| Property | Value |
|---|---|
| Class According To EN 1504-3 | R3 |
| Type | PCC |
| Consistency | powder |
| Colour | grey |
| Maximum Aggregate Size | 2.5 mm |
| Bulk Density | 1250 kg/m³ |
| Dry Solids Content | 100 % |
| Chloride Ions Content (according to EN 1015-17) | ≤0.05 % |
| Colour Of Mix | grey |
| Mixing Ratio | 100 parts of Mapegrout T40 with 15.5-16.5 parts water (approx. 3.8-4.1 l per 25 kg sack) |
| Consistency Of The Mix | thixotropic |
| Density Of The Mix | 2200 kg/m³ |
| pH Of The Mix | > 12.5 |
| Application Temperature Range | from +5°C to +35°C |
| Pot Life Of The Mix (at +20°C) | approx. 1 hour |
| Compressive Strength (1 day) | > 8 MPa |
| Compressive Strength (7 days) | > 30 MPa |
| Compressive Strength (28 days) | > 40 MPa |
| Flexural Strength (1 day) | > 2.0 MPa |
| Flexural Strength (7 days) | > 5.5 MPa |
| Flexural Strength (28 days) | > 7.0 MPa |
| Compressive Modulus Of Elasticity (28 days) | 25 GPa |
| Bond Strength To Concrete (28 days) | > 2 MPa |
| Capillary Absorption | < 0.20 kg/m²·h^0.5 |
| Thermal Compatibility (freeze-thaw cycles) | > 1.5 MPa |
| Thermal Compatibility (storm cycle) | > 1.5 MPa |
| Thermal Compatibility (dry thermal cycle) | > 1.5 MPa |
| Reaction To Fire | A1 (Euroclass) |
| Consumption | 18.5 kg/m² per cm of thickness |
Here are some common examples on where Mapei Mapegrout T40 used by our customers.
