New “Joosten Multimat®” for covering waste incineration slag
Building Materials Decree:
Multimat has been evaluated as suitable as an insulating layer for special category incinerator bottom ash by application of CROW 144. From this it can be concluded that Multimat is suitable for insulating work with special category incinerator bottom ash (DHV Milieu en Infrastructuur BV 2 January 2003).

Joosten Kunststoffen has developed a new Multimat® for covering waste incineration slag. Waste incineration slag is used in work such as roads/motorways as a material for building up and insulation.

Existing cover designs are attacked by the waste incineration slag. Multimat® has an extra protective later that stops this attack.

Multimat® is made of a high-quality bentonite mat which is protected on top by a heavy woven geotextile. The bentonite mat is protected from attack on the underneath by a liquid-proof layer of PE. This PE layer is protected on both sides by a non-woven geotextile.

Multimat® is just as easy to apply as a bentonite mat. It is delivered complete ex works on a 30 x 4 metre roll. This means the sealing quality in the field is always constant. The membranes can easily be joined with a watertight joint.

Joosten also envisages applications at dumping sites.

Laying Multimat

The Multimat is unrolled without folds. It is laid with the side with the woven geotextile (black) upwards. The side with the non-woven geotextile is underneath. Woven side (black) Non-woven side (white)

Connecting the lengths
The Multimat strips are laid parallel to one another with a 20 cm strip of the lower geotextile protruding.
The adjacent strip of Multimat is then applied to this and the undersides are joined.
The non-woven geotextile (the white material) consists of PP and can be welded with hot air.

Joining the strips in a waterproof way
For this, strip 2 is lifted manually. The two white sides of the geotextile are heated with hot air and then immediately applied to one another. The entire seam is joined in this way.

Perform a test on a sample before starting. This sample is inspected visually to check that the join is good. If necessary this is repeated until sufficient experience has been gained in joining the strips.
Finally bentonite powder is sprinkled on the seam and a 50 cm wide geotextile applied.

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