Nitokit LV & Nitokit TH
Pre-packaged low viscosity or thixotropic epoxy crack injection system.
Uses:
Nitokit LV and Nitokit TH are designed for injecting cracks in concrete and masonry where there is a need to consolidate a structure or exclude water and air from contact with reinforcement.
Nitokit LV is a low viscosity system and is suitable for cracks down to 0.2 mm at the surface and internal cracks tapering down to 0.01 mm.
Nitokit TH is a thixotropic system and can be injected into open ended cracks where depth and quantity of resin need to be controlled. The Nitokit systems are ideal for small scale repairs on site and are also suitable for in-situ or precast concrete elements.
Advantages:
- Self contained packs include everything necessary to complete the crack injection
- Convenient to use disposable cartridge contains both resin and hardener
- Safe and clean to use, non-return valves avoid leakage and spills
- High strength, excellent bond to concrete, brickwork and masonry
- Low viscosity and thixotropic options allow cost effective and efficient repair
Description:
Nitokit LV or Nitokit TH basic pack incorporates a two-part epoxy crack injection resin contained in a patented single cartridge, complete with injection nipples and hoses. A selection of either Nitokit LV, a low viscosity system or Nitokit TH, a thixotropic system, ensures the most cost effective and efficient solution.
The Nitokit accessory pack contains additional items which are complementary to the basic pack — a two-part surface sealer and adhesive for fixing nipples and sealing cracks, an injection gun and the basic safety wear, gloves and goggles.
Specification clauses:
Low viscosity crack injection
The crack injection system shall be Nitokit LV. It shall be applied strictly in accordance with ‘Application instructions’ given in the product data sheet.
Thixotropic crack injection
The crack injection system shall be Nitokit TH. It shall be applied strictly in accordance with ‘Application instructions’ given in the product data sheet.
Properties:
Nitokit LV and Nitokit TH resin
Usable life at 10°C: 100 minutes
- 20°C: 50 minutes
- 30°C: 25 minutes
- 40°C: 15 minutes
Viscosity at 10°C: 400 to 800 mPas
- (Nitokit LV only) 20°C: 250 to 500 mPas
- 30°C: 100 to 250 mPas
Set time at 10°C: 12 hours
- 20°C: 7 hours
- 30°C: 5 hours
- 40°C: 3 hours
When cured for 7 days at 20°C
- Compressive strength: > 70 N/mm² (BS 6319)
- Flexural strength: > 45 N/mm² (ISO R178)
- Tensile strength: > 55 N/mm² (ISO 527)
- Modulus of elasticity: 2800 N/mm²
- Elongation at break: 2.5%
- Tensile bond strength: When tested to BS 3900, Pt E10 in both dry and wet states is greater than average concrete
Nitokit Surface Sealant:
Usable life at 20°C: 15 to 35 minutes dependent on mix ratio and quantities Set time at 20°C: 1 to 2 hours dependent on mix ratio
Application instructions:
Personal protection:
Refer to ‘Health and safety’ section of this data sheet before commencing work.
Surface preparation:
Nitokit Surface Sealant has to retain the injection system under pressure. Care must be taken to provide a bond surface which is dry and free from any contamination.
Mixing the surface sealant:
Only mix enough sealant that can be applied within the usable pot-life. Pour a small quantity of the resin into the mixing bucket provided and slowly add the powder. Stir until a smooth thick cream consistency is obtained.
Application of the surface sealant:
Immediately after mixing, apply a small amount of sealant to the back of each nipple ensuring that the valve will not be blocked, then place the nipple to ensure the valve (centre) is firmly over the crack. Nipples should be placed between 200 and 500 mm apart dependent on crack size. Additional sealant should be applied to the flange of the nipple to ensure a resin-tight seal to the substrate. Nitokit Surface Sealant should be knifed into the crack between nipples to ensure a resin-tight seal. Where cracks can be sealed on one side only, nipples should be placed at centres which are 80% of the depth to which the resin is required to penetrate.
Application of the injection resin may commence as soon as the Nitokit Surface Sealant has fully hardened (at least 1 hour at 20°C or 2 hours at 10°C).
Injection of the Nitokit LV epoxy resin:
- Lightly tap the side of the resin capsule near the base with a hammer two or three times on different sides to break internal glass container of hardener. (The glass can be heard moving when broken.)
- To mix the resin, invert the cartridge twenty to thirty times slowly. Do not shake vigorously otherwise air will be incorporated. Pierce the foil sealed threaded end of the cartridge. Screw the Nitokit LV hose on to the cartridge. Ensure the ‘O’ ring is in place on the cartridge. Do not over tighten the fitting as this may distort the ‘O’ ring.
- Use the mixed material within the useable life.
- Place the cartridge into the gun supplied with the accessory pack.
- Push the free end of the Nitokit hose on to the lowest nipple and tighten the locking cap. Do not over tighten.
- Insert an air release pin into the next nipple adjacent to the injection point. Note: do not start pumping until the air release pin is inserted to release the non-return valve and enable it to release trapped air.
- Commence pumping slowly. Do not use excessive pressure. The rate of acceptance into fine cracks may be very slow.
- When resin appears at the nipple adjacent to the injection point: Stop pumping.
- Release the pressure on the injection gun.
- Remove the air release pin.
- Unscrew the cap and, with a twisting movement, pull off the Nitokit hose. Attach the Nitokit hose to the next nipple, insert air release pin in the nipple beyond and recommence pumping.
- Repeat the process until the entire length of crack has been injected.
On completion of pumping, the last cartridge can be left connected and pressurised slightly to allow for possible seepage into deep-seated cracks.
Injection of the Nitokit TH epoxy resin:
- Cut the top off the conical nozzle and insert T-shaped rod and turn clockwise to engage mixing head in cartridge.
- Push rod down the full length of the cartridge to break the membrane separating the resin and hardener.
- Pump up and down thirty to forty times to mix resin and hardener.
- Turn the T-shaped rod anti-clockwise to disengage and then remove. Do not shake.
- Unscrew the conical nozzle and discard.
- Screw the Nitokit hose onto the cartridge. Ensure the rubber ‘O’ ring is in place on the cartridge. Do not over tighten the fitting as this may distort the ‘O’ ring.
- Use the mixed material within the usable life.
- Place the cartridge into the gun supplied with the accessory pack.
- Push the free end of the Nitokit hose on to the nipple positioned over the widest point of the crack and tighten the locking cap. Do not over tighten.
- Insert an air release pin into the next nipple adjacent to the injection point. Note: do not start pumping until the air release pin is inserted to release the non-return valve and enable it to release trapped air.
- Commence pumping slowly. Do not use excessive pressure. The rate of acceptance into fine cracks may be very slow.
- When resin appears at the nipple adjacent to the injection point, stop pumping.
- Release the pressure on the injection gun.
- Remove the air release pin.
- Unscrew the cap and, with a twisting movement, pull off the Nitokit hose.
- Attach the Nitokit hose to the next nipple.
- Insert air release pin in the nipple beyond and recommence pumping.
- Repeat the process until the entire length of crack has been injected
On completion of pumping, the last cartridge can be left connected and pressurised slightly to allow for possible seepage into deep-seated cracks.
Nitokit LV & Nitokit TH / Resin injection
Concrete Renovations - The concrete repair specialists
