Description

Crack injection resin for stopping water flow

Uses

For injecting into cracks in concrete to temporarily stop the flow of moving water. When used in conjunction with Nitofill UR63*h provides an effective system for crack sealing in wet conditions.

Advantages

• Reacts with water to produce water resistant foam to stop water
• Rapid acting, to produce water stop against moving water under pressure
• Re-injectable with Nitofill UR63 to form permanent seal

Specification

Water-stopping crack injection resin

The foam water-stopping crack injection resin shall be Nitofill WS60, a two part foaming liquid polyurethane. When mixed in the proportions supplied and injected into cracks in concrete, the resin shall react with moving water to form a foam water-stopping barrier.

The water-stopping injection resin shall have the following properties; pot life, in the absence of water, 6 – 8 hours at 20°C, 3 – 4 hours at 35°C; reaction time with water, 5 – 30 seconds, dependent on temperature; viscosity of 2 – 3 poise, at 20°C; specific gravity of 1.14 ± 0.06; foam density of 0.025.

When used in conjunction with Nitofill UR63, a flexible two part polyurethane injection resin, it shall form a permanent seal in cracked concrete.

Description

Nitofill WS60 two part liquid polyurethane is mixed in the proportions supplied and injected into cracks in concrete. It reacts with moving water to form a foam barrier. Used in conjunction with Nitofill UR63 it forms a permanent seal in cracked concrete.

Design criteria

Nitofill WS60 is designed to stop the movement of water in cracked concrete. Crack widths of between 0.2 – 5 mm can be treated dependent on water flow. Nitofill WS60 is not designed as a permanent solution to water movement and must be used in conjunction with other means of permanently stopping the water flow. Other injection resin systems such as Nitofill UR63, Nitofill EPLV*h, should be considered. Consult the local Fosroc office for further details.

Properties

The following properties were obtained at a temperature of 20ºC unless otherwise specified.

Instructions for use

Nitofill WS60 can be applied using either injection packers fixed into holes drilled directly into the crack or drilled diagonally from concrete adjacent to the crack or by the fixing of injection nipples bonded to the surface using Nitomortar FC*h. On wide cracks and where there is a large flow of water the use of Renderoc Plug*h, a rapid setting cement based, water-stopping mortar, should be considered for initial control of water.

Preparation

If water flow permits, clean the surface adjacent to cracks and remove any dust, unsound or contaminated material, plaster, oil, paint, grease, corrosion deposits or algae.

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 – 500 mm. Where practical the surface of the cracks between the packers shall be sealed with a band of Nitomortar FC, 30 – 40 mm wide and 2 – 3 mm thick. Both sides of any cracks which go all the way through a wall or slab shall be sealed this way. Please note: Where water flow is severe the Nitomortar FC 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 Nitomortar FC shall be allowed to cure for 8 hours at 35°C. At low ambient temperatures (5°C – 12°C) the curing time will be extended and the applicator shall ensure that the surface sealant 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 operation. Sufficient material shall, therefore, be made ready prior to the commencement of the work.

Nitofill WS60Ö

Nitofill WS60 application

Thoroughly mix the accelerator with the base resin. Take care to exclude moisture as much as possible and place in an enclosed container after mixing. There will be a skin on the surface but the liquid underneath will be satisfactory for use. Nitofill WS60 should be used with standard injection equipment having closed containers.

When flowing water has stopped re-inject with Nitofill UR63 to give a permanent seal. Nitofill WS60 should be used with standard injection equipment having closed containers. When flowing water has stopped re-inject with Nitofill UR63 to give a permanent seal.

Making good

Remove the packers or nipples. Make good any holes or voids with Nitomortar FC and allow curing. The Nitomortar FC can be ground off or softened with a blow lamp and peeled off. Do not allow to burn.

Cleaning

Nitofill WS60, Renderoc Plug and Nitomortar FC should be removed from tools, equipment and mixers with Fosroc Solvent 102 immediately after use. Hardened material can only be removed mechanically.

Limitations

Nitofill WS60 is only to be used for temporary water stopping. It should not be relied upon for permanent sealing. At high water pressures, on wide cracks Nitofill WS60 may not be capable of stopping water and the local Fosroc office should be consulted.

If any doubts arise concerning temperature, application or substrate conditions, consult the local Fosroc office.

Estimating

Supply                                                                  

Nitofill WS60                    :     1 litre pack

Nitomortar FC                 :     1 & 3 kg packs

Renderoc Plug                :     25 kg bags

Fosroc Solvent 102       :     4 & 20 litre cans

Storage

All products have a shelf life of 6 months at 20°C if kept in a dry store in the original, unopened containers. Store in dry conditions in the original, unopened containers. If stored at high temperatures and/or high humidity conditions the shelf life may be reduced to 2 – 3 months.

Precautions

Health and safety

Nitofill WS60 contains isocyanates which may cause sensitizations by inhalation. Nitomortar FC, and Fosroc Solvent 102 should not come in contact with skin or eyes, or be swallowed. During use avoid contact with skin and eyes and inhalation of vapour. Some people are sensitive to resins, hardeners and solvents. Wear suitable protective clothing, gloves and eye/face protection. Use only in well ventilated areas, if working in confined areas, suitable respiratory protective equipment must be used.

Renderoc Plug contains cement powder which when mixed or becomes damp releases alkalis which can be harmful to skin. During use avoid inhalation of dust and contact with skin and eyes. Wear suitable protective clothing, gloves and eye/face protection.

The use of barrier creams provides additional skin protection. Should accidental skin contact occur, remove immediately with a resin removing cream followed by soap and water. Do not use solvent. In case of contact with eyes, rinse immediately with plenty of clean water and seek medical advice. If swallowed seek medical attention immediately – do not induce vomiting. For further information, refer to the Product Material Safety Data Sheet.

Fire

Nitofill WS60, Nitomortar FC and Renderoc Plug are nonflammable. Fosroc Solvent 102 is flammable. Keep away from sources of ignition. No smoking. In the event of fire extinguish with CO₂ or foam. Do not use a water jet.

Flash point                                                           

Fosroc Solvent 102               :       33°C

* Denotes the trademark of Fosroc International Ltd.

h See separate data sheet