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Hairline to fine concrete cracks compromise structural integrity. ARDEX RA 142's super low viscosity (190 cps) penetrates even the tightest 0.05mm cracks. It structurally fuses concrete for lasting repair, restoring monolithic strength.
Concrete structures often develop hairline to fine cracks. These micro-fractures can impact the long-term durability and load-bearing capacity of a slab or element. ARDEX RA 142 is a two-component, solvent-free epoxy adhesive engineered for the structural repair of these dormant concrete cracks, from 0.05mm to 3mm wide. Its formulation ensures deep penetration for both gravity-feed and pressure injection applications, making it suitable for restoring the integrity of horizontal and vertical concrete surfaces. It also serves as a robust bonding agent for concrete and forms a high-strength mortar for spall repair when mixed with aggregate.
ARDEX RA 142 comes in a dual cartridge system, simplifying mixing and dispensing. Proper surface preparation is critical: concrete must be clean, dry (for best results), and mechanically roughened for optimal adhesion. For vertical crack injection, ARDEX RA 88 is the recommended capping paste to secure injection ports and seal the crack surface, forming a complete system. Maintain ambient and substrate temperatures between 10°C and 35°C. Lower temperatures will slow the cure, while higher temperatures accelerate it. Clean tools immediately after use with white spirits or mineral turps before the epoxy hardens.
ARDEX RA 142 is a core component of the Ardex concrete repair system for structural crack injection. When addressing vertical cracks, it works in conjunction with Ardex RA 88 Plus Multi-Purpose Epoxy Repair Adhesive. RA 88 acts as the capping paste, sealing the crack face and securing injection ports, creating the necessary containment for RA 142 to be pressure-injected into the crack. This sequence ensures the super low viscosity RA 142 effectively penetrates and fills the entire crack network for a comprehensive structural repair.
ARDEX RA 142 is specifically engineered for the structural injection of hairline to fine concrete cracks. For wider cracks (beyond 3mm), ARDEX RA 144 provides a suitable solution with a slightly higher viscosity designed to fill larger voids effectively. When performing vertical crack injection, ARDEX RA 142 is designed to be paired with Ardex RA 88 Plus Multi-Purpose Epoxy Repair Adhesive, which functions as a high-strength capping paste. RA 88 creates the essential seal and secures the injection ports, allowing RA 142 to be precisely injected into the crack network and achieve its full structural repair potential.
No, ARDEX RA 142 is not designed for active cracks. It is formulated for dormant cracks in structures where the cause of cracking has been addressed and further movement is not expected.
ARDEX RA 142 is engineered for hairline to fine cracks, specifically those between 0.05mm and 3mm. Its low viscosity of 190 cps ensures deep penetration into these narrow defects.
This epoxy provides significant structural strength, achieving 70 MPa compressive and 50 MPa tensile strength after 7 days. This allows it to restore load-bearing capacity to cracked concrete members when used correctly.
No, ARDEX RA 142 is not designed to stop seeping or flowing water. While it can be applied in moist environments, all standing or flowing water must be stopped and removed before application for effective repair.
| Application | Key benefit | Primary trades |
|---|---|---|
| Gravity-feed horizontal crack repair (0.05mm - 3mm) | Deep penetration into hairline cracks and restoration of concrete's structural load-bearing capacity (70 MPa compressive strength). | Concrete repairers, Civil contractors |
| Pressure injection for vertical cracks (with ARDEX RA 88) | Ensures full crack void fill in vertical sections, restoring structural integrity and preventing further damage. | Structural engineers, Concrete repairers |
| Bonding hardened concrete to hardened concrete | Achieves a high-strength, permanent bond (11 MPa shear bond at 7 days) for concrete sections. | Concreters, Commercial builders |
| Epoxy mortar for spall repair (with aggregate) | Creates a durable, high-strength repair up to 35mm thick, resisting further deterioration. | Concrete maintenance, Remedial builders |
A successful repair starts with proper preparation. Ensure the concrete is sound, clean, and completely dry. New concrete must be cured for at least 28 days.
Use a wire brush to clean the crack surface. Blow out all dust, debris, and contaminants from within the crack using clean, oil-free compressed air. This step is critical for achieving a full structural bond.
For hairline cracks in horizontal slabs, consider using a grinder with a diamond blade to cut a V-groove. This creates a small reservoir, making it easier to gravity-feed the epoxy and ensuring a complete fill.
Proper cartridge preparation prevents mix issues and ensures consistent performance.
Place the 470mL cartridge into the dispenser gun. Remove the plastic cap and plug, then dispense a small amount of material into a disposable container until both Part A and Part B are flowing evenly.
Attach the static mixing nozzle to the cartridge. Dispense and discard the first 1-2 trigger pulls of material to ensure a perfectly mixed product from the start.
Select the application method based on the crack's orientation.
Slowly dispense the mixed epoxy directly into the prepared crack or V-groove. Allow the product's self-levelling properties to fill the void completely. Re-apply if necessary to ensure the crack is filled flush to the surface.
Securely attach injection ports along the crack and seal the crack face with Ardex RA 88 Capping Paste. Start injecting at the lowest port and continue until epoxy flows from the port above. Plug the first port and move to the next, repeating until the entire crack is filled.
Allow the repair to achieve full strength before proceeding.
ARDEX RA 142 is considered hazardous. Always refer to the Safety Data Sheet (SDS) before use.
Wear suitable gloves and eye/face protection to avoid skin and eye contact. Obtain special instructions before use.
Store in original unopened packaging in a dry place between 13°C and 27°C at 50% relative humidity. Shelf life is 24 months. Do not empty into drains. Dispose of material and containers in a safe manner as per local regulations and SDS.
Proper surface preparation is critical for achieving a reliable structural bond and preventing premature failure in concrete repair applications.
Surface prep: Old concrete must be clean, profiled, or textured. New concrete requires a minimum 28-day cure. All surfaces must be sound and free of dust, dirt, grease, wax, oil, or other contaminants. Smooth concrete should be mechanically roughened with a wire brush or sandpaper.
Primer: Not required. ARDEX RA 142 serves as its own bonding agent.
| Property | Value |
|---|---|
| Colour | Amber tint |
| Mixed Viscosity | 190 cps |
| Gel Time (+24°C) | 20 minutes |
| Compressive Strength (7 days) | 70 MPa |
| Tensile Strength (7 days) | 50 MPa |
| Shear Bond Strength (2 days) | 8 MPa |
| Shear Bond Strength (7 days) | 11 MPa |
| Elongation at break (7 days) | 1.8% |
| Water Absorption (24 hours) | ~0.2% |
| Application Temperature Range | 10°C to 35°C |
| Cure Time (Full) | 24 hours |
| Shelf Life | 24 months |
| Packaging | 470mL dual cartridge |
Here are some common examples on where Ardex RA 142 Structural Crack Injection Epoxy used by our customers.
Civil Construction
When fine, dormant concrete cracks (0.05-3mm) compromise structural integrity in slabs or walls.
Its super low 190 cps viscosity ensures deep penetration into the tightest cracks, structurally fusing concrete to restore strength.
Civil Construction
Repairing damaged concrete sections requiring a high-impact, durable infill where aggregate can be added.
Mixed with aggregate, it forms a robust epoxy mortar, providing high compressive strength for durable and impact-resistant repairs up to 35mm thick.
Civil Construction
When bonding new concrete overlays or repairs to existing hardened concrete substrates for monolithic performance.
It creates a strong, durable bond between concrete layers, ensuring structural continuity and preventing delamination.
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