Lavarep Spx
High Strength Non-Shrink Fiber Reinforced Polymer Modified Sprayable Concrete Repair Mortar
LAVAREP SPX is a sprayable, fiber-reinforced, polymer-modified, shrinkage-compensated repair mortar formulated for concrete restoration using wet or dry spray techniques. Its non-sag, thixotropic properties allow for application without formwork on vertical and overhead surfaces such as columns, slabs, and shear walls. LAVAREP SPX offers high compressive strength, excellent impact resistance, and shrinkage control, reducing cracking and ensuring strong, durable repairs. Ideal for large-scale repairs and fast-paced applications, it provides consistent performance and workability, making it a go-to solution for infrastructure and industrial projects requiring robust and efficient concrete rehabilitation.
Technical data:
- Appearance : Cement grey powder
- Application Temperature : 5°C to 40°C
- Coverage : 2.2 kg per square meter @ 1 mm thickness
- Yield : 13.5 liters per 25 kg bag
- Packaging : 25 kg bag
How to Apply Lavarep Spx
Lavarep SPX is mixed with clean water and sprayed by machine, or applied by trowel, onto a prepared, saturated surface dry (SSD) substrate.
- Prepare the concrete. Clean the substrate of all grease, contaminants, oil and loose material. Clean exposed corroded steel thoroughly until rust free, using sand blasting for deep rusting, and add bars where the section is reduced by oxidation.
- Protect reinforcement. Immediately coat the cleaned reinforcing steel with one coat of Lavazinc EP or Lavafer. Where a substrate/repair barrier is required or for damp application such as sea walls, use Lavabond EP on the substrate.
- Saturate the substrate. Soak the substrate with water and allow excess to drain or evaporate to a saturated surface dry (SSD) condition before applying the mortar.
- Mix. Pour 3.75 to 4.25 liters of clean water (depending on application method) into a container and slowly add the 25 kg bag. Mix with a spiral paddle on a slow-speed heavy-duty drill until homogeneous and lump free; extra water is not allowed.
- Spray. Spray the mixed mortar with a suitable spray machine, first applying a sample area to confirm consistency and bond. Minimum thickness is 10 mm; maximum single layer is up to 150 mm overhead and up to 200 mm vertical.
- Hand apply (alternative). For manual application use a trowel or spatula: 10 mm up to 200 mm on vertical surfaces and up to 150 mm per layer overhead. For a second vertical layer, apply the first with proper pushing and roughen it.
- Cure. Protect the repair from drying winds, sun or excessive heat. Cover with wet hessian cloth and polyethylene sheet for two days, or apply a recommended MATEX curing agent.
- Clean tools. Clean tools with water before the product hardens.
Summary of the method in the Lavarep Spx Technical Data Sheet. Always follow the full TDS on site.
Standards & Test Methods
| Standard | Title | Referenced for |
|---|
| ASTM C 109 | Standard Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube Specimens) | Listed in the TDS |
Standards and test methods as referenced in the Lavarep Spx Technical Data Sheet. Values in the TDS are typical laboratory results under standard conditions.
Frequently Asked Questions
Can Lavarep SPX be sprayed?
Yes. Lavarep SPX is designed for spraying and is suitable for wet, dry or hand application. By spray machine the maximum single layer is up to 150 mm overhead and up to 200 mm vertical, with a minimum of 10 mm.
What is the compressive strength of Lavarep SPX?
Compressive strength is >40 N/mm² at 7 days and >60 N/mm² at 28 days. Flexural strength at 28 days is >5 N/mm².
What is the coverage and yield of Lavarep SPX?
Lavarep SPX covers 2.2 kg per square meter at 1 mm thickness, and one 25 kg bag yields 13.5 liters.
What is the pot life of Lavarep SPX?
Pot life of the mixture is 35 minutes at 25°C.
Can Lavarep SPX be used to repair fire damaged concrete?
Yes. The TDS lists repair of fire damaged concrete among its uses, along with mass infill of large areas, vertical and overhead repairs, and use as a cathodic protection overlay.
