Rigid filling of a concrete crack
Assess the structure and the cause of cracking. The filling is intended to act as a rigid connection; force transfer and repair acceptance are defined by the design.
RIGID CRACK FILLING
EpoxPower
Two-component epoxy resin for rigid filling and sealing of cracks and strengthening repairs. Selection for structural bonding requires an assessment of the cause and activity of the crack.
| Product / pump | Epoxy A + B; 1K pump after mixing |
|---|---|
| A : B ratio | 100 : 25 by weight (4 : 1) |
| Mixture viscosity | 350 mPa·s at 20°C |
| Mixture density | 1.10 g/cm³ at 20°C |
| Working / curing time at 20°C | 10 min / 6 h |
| State after reaction | Rigid bond; no foaming on contact with moisture |
Technical data
Read values together with the temperature, material state and test conditions.
| Viscosity of A / B / mixture at 20°C | 750 / 25 / 350 mPa·s |
|---|---|
| Density of A / B / mixture at 20°C | 1.15 / 0.95 / 1.10 g/cm³ |
| Compressive strength | Minimum 50 MPa |
| Tensile strength — designation in the TDS | Minimum 15 MPa |
| Elongation at break | Approximately 3.5% |
| Application temperature | Material, ambient and substrate above +5°C |
| Working / curing time at 20°C | 10 minutes / 6 hours |
Mechanical values describe the material; the TDS does not state the test method or specimen age for these values. They are not the design capacity of the repaired element. 6 hours of curing does not mean 6 hours are available to inject the resin.
- Storage and shelf life
- +5 to +30°C; 12 months in the original, unopened packaging.
Applications and selection criteria
First establish the repair objective, substrate condition, presence of water and joint movement.
Dry and slightly damp substrates
The TDS covers dry cracks and moisture tolerance without foaming. Where water flows through a crack, first address the ingress and surface preparation.
Strengthening fills in masonry and structures
The scope of the TDS includes stabilising and strengthening injections. Match viscosity and the delivery path to the pores, voids and substrate condition.
Application conditions and limitations
EpoxPower forms a rigid filling. Do not select it as a flexible seal for an active movement joint or for automatic accommodation of further crack movement. Eliminating the cause of damage and checking the repair remain part of the structural task.
How the material behaves
Dry cracks; moisture tolerance does not mean application in active flow. Rigid filling; do not extend selection to a moving expansion joint.
1. Preparation
A + B at a weight ratio of 4 : 1
2. Delivery
Prepared mixture through a 1K pump
3. Result
Rigid filling after curing
Preparation and application
Work sequence after assessing the structure and selecting the method. Full requirements are given in the product instructions.
Assess and prepare the crack
Remove loose fragments and dirt. Drill holes, clean them with compressed air, install packers and close the crack surface in accordance with the method.
Measure A and B by weight
To 100 parts of A, add 25 parts of B. Pour B into A and mix thoroughly with a low-speed mixer. Do not replace the weight ratio with equal volumes.
Prepare small batches
Inject immediately with a 1K pump. At 20°C, the working time is 10 min; higher temperatures shorten the delivery time. Match the batch size to output and access to the injection points.
Observe filling and allow to cure
For a vertical crack, start at the lowest point. Track material passage, quantity and outflows. Curing at 20°C takes 6 h; specify the time before loading the repair in the method.
From selection to application
Choose the instructions for your task and calculate material quantities using clearly defined assumptions.
Product documentation
Data, application instructions and safety documents for the supplied material.
Preparing for safe work
Before use, read the current documentation for all supplied components. Select protective equipment, ventilation and cleaning methods appropriate to the material and equipment.
Discuss your project conditions
Prepare a description of the substrate, water, geometry and expected result. Let us select the material and delivery method.