Restoring damaged concrete surfaces to a sound, durable condition is critical, especially before applying membranes or finishes. RLA Penapatch HB50 provides a high-build, shrinkage-compensated solution for patching spalled concrete, vertical elements, and precast components. It re-establishes structural integrity and prepares the surface for subsequent layers.
RLA Penapatch HB50 was formulated for robust concrete repair, addressing common issues like spalling around corroded reinforcement, and damage to vertical and overhead elements such as columns, beams, and soffits. It is also engineered for reinstating sharp edges and corners on precast panels. The product's design focuses on achieving high build without slump, while ensuring long-term durability, particularly in environments exposed to chlorides or carbonation.
This repair mortar allows for significant application thickness, facilitating build-ups of up to 80mm in a single pass on vertical and overhead surfaces. This high-build capability minimises the number of layers required for deep repairs, saving time on site. Its shrinkage-compensated formulation is designed to reduce cracking, which helps maintain crisp edges and prevents a common failure point for subsequent membrane or tile installations. The low permeability characteristic of Penapatch HB50 contributes to long-term durability by resisting ingress from aggressive agents like chlorides and carbon dioxide, crucial for infrastructure longevity.
RLA Penapatch HB50 is designed for trowel application. Its thixotropic, non-slump consistency supports efficient high-build placement on vertical and overhead surfaces without sag, reducing rework and speeding up repair operations.
RLA Penapatch HB50 is particularly effective for:
This product typically functions as a final step in comprehensive concrete repair systems. For example, in situations requiring robust concrete restoration, RLA Penapatch HB50 follows the application of an epoxy primer like Megapoxy H. This sequence ensures optimal adhesion and prepares the substrate for subsequent finishes or protective layers, especially when the area will be membrane-covered and tiled.
Typical single-lift range is 5–80 mm on vertical surfaces. In small pockets or with formwork, depths up to ~120 mm are achievable. For thicker sections, build in layers with adequate curing between lifts.
Use ~3.0 L of clean water per 20 kg bag. Mix to a cohesive, non-slump consistency suitable for vertical or overhead placement. Do not over-water and do not re-temper.
Covers approximately 1.85 kg/m²/mm. A 20 kg bag yields about 1.08 m² at 10 mm thickness. Always allow for substrate profile and wastage.
Yes. It is suitable for internal and external applications on properly prepared concrete. Protect fresh repairs from rain, sun and wind during early cure.
Once the repair has hardened and dried sufficiently. Timing depends on thickness and conditions. Follow the coating manufacturer’s moisture/strength requirements and carry out a moisture check before coating.
Apply between 5–35 °C. In hot or windy conditions, cool materials where possible and implement curing to prevent rapid moisture loss.
| Application / Use Case | Key Benefit | Primary Trades |
|---|---|---|
| Spalled concrete repairs around corroded reinforcement | High build with strong bond and low permeability for durability | Remedial contractors, builders |
| Vertical/overhead patching of columns, beams, soffits | Thixotropic, non-slump placement up to 80 mm in a pass | Builders, civil contractors |
| Precast panel edge and corner reinstatement | Shrinkage-compensated, high early/ultimate strength for crisp edges | Precast installers, remedial specialists |
| Durability repairs in chloride-exposed infrastructure | Low permeability to resist chloride ingress and carbonation | Engineers/specifiers, asset maintenance |
Cut back to sound concrete; remove weak/contaminated material. Clean and pre-dampen to SSD. Protect adjacent finishes.
Scabble, grind or high-pressure water-blast to expose sound aggregate and provide a profile.
Saw-cut to a minimum depth to avoid feather edges and ensure patch integrity.
Add powder to ~3.0 L clean water per 20 kg while mixing with a low-speed drill (≈400–600 rpm) or paddle mixer. Mix to a cohesive, thixotropic paste.
Adjust within manufacturer tolerance for placement method; do not over-water.
For difficult substrates, prepare a thin bonding slurry and apply wet-on-wet before main placement.
Press firmly into the substrate, compact to eliminate voids, and build to the required thickness.
Single pass 5–80 mm vertical/overhead; up to ~120 mm in small pockets or with formwork. Layer for deeper sections.
Float/sponge finish once material has firmed sufficiently; avoid over-working the surface.
Protect fresh repairs from rapid drying, rain and temperature extremes. Implement curing suitable to conditions (e.g., curing compound, damp hessian, or shade).
Overcoat once the repair has hardened and dried to the coating manufacturer’s requirements. Verify moisture and surface condition before coating.
Wear gloves, safety glasses and a P2/P3 dust mask when handling powder and mixing. Use protective clothing to avoid skin contact.
Ensure good ventilation during mixing and placement, especially indoors or in confined spaces.
Non-flammable. Avoid generating airborne dust. Store sealed in a cool, dry area away from moisture uptake.
Seek medical attention immediately in all cases of serious exposure.
Mechanically remove laitance, weak or contaminated layers; break out to sound substrate. Saw-cut perimeter; avoid feather edges. Pre-dampen to SSD (surface-saturated, no standing water).
Where substrates are highly absorbent or placement conditions are challenging, a compatible bonding slurry (HB50 mixed to a thin slurry) may be used to promote adhesion. Place wet-on-wet.
Bonding slurry (site-made)Clean to bright metal; remove rust/scale. Replace severely corroded sections per engineering advice.
If specified, apply an appropriate steel primer/passivator and allow to cure before placing HB50.
Steel passivating primer (as specified)Prepare to sound concrete and SSD. Maintain minimum thickness; compact to avoid entrapped air.
Where substrate is very smooth, lightly roughen to create a mechanical key.
—Remove friable material; roughen and clean. Pre-dampen to SSD prior to placement.
Use a cementitious bonding slurry or compatible bonding agent per project spec.
Cementitious bonding slurry| Property | Value |
|---|---|
| Base Chemistry | Polymer-modified, Fibre-reinforced cementitious mortar |
| Colour | Grey |
| Density | 2120 kg/m³ (approx.) |
| Compressive Strength | 1 day: 15 MPa, 7 days: 40 MPa, 28 days: 55 MPa |
| Flexural Strength | 1 day: 5 MPa, 7 days: 7 MPa, 28 days: 8.5 MPa |
| Shrinkage | Shrinkage compensated (dimensionally stable) |
| Application Temperature | Yes (conforms to standard requirements) |
| Humidity Range | 5–80% |
| Water Vapour Transmission | Low (chloride and carbonation resistance) |
| Water Ratio | 3.0 L |
| Coverage Rate | ≈ 1.08 m² |
| Bed Thickness | Up to ~120 mm |
| Packaging | 20 kg bag |
| Shelf Life | 12 months (unopened, Dry storage) |
Here are some common examples on where RLA Penapatch HB50 Mortar used by our customers.
