Repairing Cracks in Concrete
Impripox is an epoxy that can be poured into cracks in concrete to repair them. Follow the directions below to repair cracks in concrete in advance of applying Microcement.
The mix ratio of Impripox to Impripox Comp B is 5:2 or 1l:400ml. The expected drying time is 12 hours, this may vary depending on external conditions & depth.
Mixing the Impripox
Mix the Impripox with Impripox Hardener in a mixing jug and stir gently with a paint stirrer for a few minutes.
The Mix Ratio is:
5 x Impripox : 2 x Impripox Hardener.
1l Impripox : 400ml Impripox Hardener.
Working Time
You will have a working time of around 1 hour once the Impripox has been mixed with the hardener.
Repair cracks under 3mm wide
Use a 5” grinder to open up the crack (take care not to cut into any underfloor heating), hoover out any dust then mix Epoxy with Epoxy Hardener (Ratio 5:2) and pour into the crack. Leave to cure fully, this will take for at least 12 hours. It may need topping up depending on how deep the crack is.
Repair cracks over 3mm wide
Use a 5” grinder to open up the crack and grind approx 100mm “stitches” horizontally across the length of the crack around 40mm apart (take care not to cut into any underfloor heating), hoover out any dust then insert steel helical stitching bars into the stitches. Mix Epoxy with Epoxy Hardener (Ratio 5:2) and pour into the crack. Leave to cure fully this will take for at least 12 hours. It may need topping up depending on how deep the crack is.
Applying Quartz Sand
Whilst the Impripox is still wet, spread the quartz sand across the surface. Leave to dry. Minimum of 12 hours. Ideally overnight.
Top Tip
It’s imposible to know how deep a crack actually is. If you find it’s taking a lot of Impripox to fill, you could always mix some quartz sand into the Impripox to thicken it up.
Advisable
Whilst this process will fill and add strength to the crack. We would also recommend using the high performance primer option to add further protection against the crack transfering through to the microcement should further movement occur.