1202 CC Thermal Welding

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CC Title

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Concrete Impregnated Fabric...

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Water Proof Rating : Mechanical Strength :

Concrete Canvas can be sealed by thermally welding PVC facestogether. The recommended method will enable one man to weld

joints at a rate of 40m/hour.

The following equipment is required:

Hot air gun with 6mm reducer

Pinch roller clamp

Heavy gloves

Damp cloth

Mask

To thermally weld a water proof sealbetween two sheets of CC :

1. Place the adjacent sheets with the PVC side down and overlapping

by a minimum of 100mm

2. Lift the overlapped sections of the sheets so that the PVC

faces are touching (Fig.1).

3. Clean the PVC faces on the overlap to remove any dust using a

damp cloth.

4. Fit the heat gun with a 6mm reducer and run it slowly along the

joint, blowing the hot air forwards and down between the two sheets

to evenly soften the PVC across 40mm of the overlap. Take care notto burn the PVC. Clamp the twin pinch rollers on either side of the joint

and push the rollers along the joint behind the heat gun to press thetwo sides together while the PVC is still soft (see Fig. 1 and Fig. 2).

Allow the joint to cool.

5. Once all the joints are sealed and the CC has been wetted, fold one

side of the jointed section over and weigh it down until the Canvas

has set. (Fig.3)

Wear heavy gloves and a mask as the PVC will be hot and will

give off fumes. Only seal Concrete Canvas in a well ventilated

area.

Concrete Canvas Thermal Welding

Direction

of weld

Pinch rollers

Hot air nozzle

CC Layer 1 CC Layer 2

Fibre face

PVC side

Fibre face

Fibre Side

Fig. 4 Thermally welded CC Joint

Fig. 3

Fig. 1t

Fig. 2

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The information contained herein is offered free of charge and is, to the best of our knowledge, accurate. However, since the circumstances and conditions in which such information and the products

discussed therein can be used may vary and are beyond our control, we make no warranty, express or implied, of merchantability, fitness or otherwise, or against patent infringement, and we accept no

liability, with respect to or arising from use of such information or any such product.

Concrete Canvas 2012

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Concrete Canvas (CC) can be used to line any sized ditch, trench, water tank or sump. The trial below demonstrated that thermal welding

provides a water tight joint between layers of CC.

A ditch with a trapezoidal profile was excavated from a sandy

substrate.

The platform was removed and the welded CC strips were gentlylowered onto the substrate. Subsequent layers were added to cover

the ditch entirely. Sandbags were placed on the thermally welded

joints to ensure they lay flat.

Two adjacent strips of CC were laid across the ditch on a wooden

platform. The CC strips were then thermally welded together.

The ditch was then filled and sprayed with water to hydrate the CC.After 24 hours, the thermally welded CC layers had set, providing a

water proof concrete layer to the ditch.

Concrete Canvas Thermal Welding Trial

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1202 CC Thermal Welding