Preparation
If water flow permit, clean the surface adjacent to the cracks and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits or algae.
The surface should preferably be prepared using high pressure water jetting or light abrasive blasting, followed by thorough washing to remove dust and remaining particles. Dirt alone may be removed with wire brushes or similar mechanical means.
Oil and grease deposits should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser. The effectiveness of decontamination should then be assessed by a pull-off test.
Blow the cracks and treated surface with oil free air to ensure complete removal of all dust and loose particles.

Fixing injection packers
The injection packers inserted into pre-drilled holes shall be fixed at intervals along the length of each crack. The distance between each packer will depend upon the width and depth of the crack. Spacing shall be close enough to ensure that the resin will penetrate along the crack to the next point of injection. This will normally be between 200 mm to 500 mm.
Where practical the surface of the cracks between the packers shall be sealed with a band of Vetorep ER350, 30 mm to 40 mm wide and 2 mm to 3 mm thick. Both sides of any cracks which go all the way through a wall or slab shall be sealed in this way.
Please note: Where water flow is severe the Vetorep ER350 application can be omitted.
In the case of a wall or slab which is cracked all the way through, packers shall be located on both sides with those at the back placed at midway points between those at the front.
Where applicable, the Vetorep ER350 shall be allowed to cure for 8 hours at 35ºC. At low ambient temperatures (5ºC to 12ºC) the curing time will be extended and the applicator shall ensure that the epoxy putty surface seal has adequately cured prior to continuing.
One end of the injection hose shall be attached to the lowest packer on vertical cracks or to either end of horizontal cracks. Each crack shall be treated in a single, continuous operations. Sufficient material shall, therefore, be made ready prior to the commencement of the work.

Design Conditions

Vetogrout UR710 is designed to stop flowing water in cracked concrete at crack widths of 0.2 to 7mm depending on water flow and pressure. The product is also re-injectable using products such as Vetogrout UR711 and Vetogrout ER717 depending on requirement. Please consult your local Saveto representative.

It can also be used to stabilize soil and create membrane barriers behind retaining walls.