The outlet on the pressure pot needs to be altered to accept a 12mm (1/2") bsp hose adapter with 4 meters (12' 0") of reinforced 12mm (1/2") tubing and a 12mm (1/2")
quarter turn ball valve. A 12mm (1/2") hose adapter or threaded attachment needs to be screwed into the valve to enable plastic mastic nozzles to be pushed or threaded onto the front of tire valve. This assembly will then serve as the grout
delivery hose and control valve.
- 7 to 10 c.f.m. compressor (minimum).
- Mixing paddle or whisk with a 150mm (6") cage.
- Electrical drill for mixing (560 r.p.m.).
- Two large mixing buckets (18 Iitres/5 US Gal min.).
- Measuring jug in litre increments.
- A large flour sieve (fine mesh)
- Power generator or 110v transformer.
- An adequate supply of mastic nozzles to suit control valve on delivery hose.
- Safety goggles and gloves
All equipment must be kept in a clean condition. Do not use oil or releasing sprays inside the pressure pot as this may contaminate the grout.
Safety goggles and gloves must be worn at all times when mixing and injecting grout.
GROUT MIXING
The grout is packed in 25 kg (56 Lbs) bags and is mixed with clean cold water.
The normal mixing ratio is 6 litres of water to one 25 kg (56 Lbs) bag of grout. One 25 kg (56 Lbs) bag will yield 16 litres (4.25 US Gal) of fluid grout when mixed.
The 6 litres (1.6 US Gal) of water can be increased by 10% (600ml OR 1 Pint) in hot weather (20°C+/68°F+), and when the substrate is very dry or porous or the injection process is through very small injection tubes.
Do not increase the water content outside these parameters as this will considerably weaken the strength of the set grout.
The grout must be mixed as follows -
Place 5 litres (1.33 US Gal) of clean/cold water into a clean mixing bucket and slowly add approx. 3/4 of one bag of Presstec grout while mixing. Add a further 1 litre (1 Pint) of water (to make up the required 6
litres/1.6 US Gal) and the remaining grout.
Continually mix the grout for 4 minutes removing all the dry mixture from the sides of the bucket. |
Allow to stand for 5 minutes, during which the mixture will start to thicken, the amount the mixture thickens will depend on the ambient temperature and the temperature of the dry grout and
water.
At this stage some or all of the 10% extra water may be added to achieve a smooth creamy texture with no peaks forming on the surface.
Pour the mixed grout into the pressure pot through the sieve.
Pressurize the pot from 3 bar to 5 bar (40-72 psi) dependent on the type and length of anchor being installed.
Cut the plastic mastic nozzle to fit the anchors orifice. On anchors with injection tubes, prime the tube with water and cut the mastic nozzle to fit over the injection tube.
Test the grout flow into a suitable bucket. If the grout flow is continuous and of sufficient pressure the anchor can be injected.
Carefully push the nozzle into the anchors orifice or over the injection tube, and position the anchor to the specified depth (minimum 25mm/1 inch beyond face of brickwork). Turn on the control valve and the grout
will flow to the rear of the anchor and inflate the sock along the length of the anchor to the front.
Move the anchor in a circular motion to facilitate the grout flow and to ensure the anchor is centred in the borehole upon completion.
At this stage the anchor will be felt to be locking in the borehole and a grout milk will appear at the front of the anchor (note the colour change in the sock). Maintain the pressure until the grout milk has stopped
flowing and the sock at the front of the anchor cannot be compressed.
Use a sponge or cloth during this process to soak up the excess grout milk and avoid the milk running down the face of the brickwork/stonework.
Any grout or milk on the wall must be washed off immediately.
Please note that the anchor is not fully inflated until the grout milk has stopped flowing through the sock.
Pressure must be maintained to allow this to be achieved.
With large injection orifices a suitable plug must be placed in the injection port immediately after removing the nozzle. |
