DATA SHEET RAWMAT HD - StocExpo

www.rawell.com [email protected]

Rawell Environmental Ltd Carr Lane, Hoylake, Wirral, Merseyside CH47 4AZ Phone: +44 (0) 151 632 5771 Fax: +44 (0) 151 632 0252

DATA SHEET

Int. Version: April 2017

RAWMAT® HDB

TYPE PP2 CONCRETE BUND LINER



DATA SHEET


2M X 50M

RAWMAT® HDB (High Density Bentonite) is a factory pre-hydrated

sodium bentonite membrane used for the containment of fuels, oil

and other hydrocarbons, a cost effective high performance barrier

for applications both beneath tanks and within the bund.

DESPATCH QUANTITIES

• 1 Roll = 2m x 50m = 100m2 - Average Weight = 860 kg

Approximate Roll Dimensions = 800mm Diameter x

2,010mm Width

• 19 Rolls (1,900m2) capacity per 20 ft Container

• 28 Rolls (2,800m2) capacity per 40 ft Road Trailer/Container

*Weight restrictions vary from country to country due to

legislation. Please obtain confirmation from Rawell on territorial

transport legislation.

HANDLING & STORAGE

• RAWMAT® HDB Type PP2 is rolled on 196mm cores. Each roll is sealed in airtight polythene film. The rolls are sheathed

in hardboard and banded prior to despatch for protection during transport and handling. Each roll has a unique batch

identification code.

• Rolls must be handled with either a 'carpet boom' attachment to a forklift or with a lifting beam, comprising a carrier

beam, chains and a spreader bar, which can be hired from Rawell. The RAWMAT® HDB Type PP2 should be stored and

handled strictly in accordance with the manufacturers instructions.

• The storage area should be dry and stable. The contractor shall ensure the RAWMAT® HDB Type PP2 or its packaging is

not damaged. Any RAWMAT® HDB Type PP2 damaged during the delivery, storage or handling should be rejected and

shall not be incorporated in the works.

• Rolls may be stacked two high in their unopened state. Rolls must be stored under cover or protected with a

weatherproof sheet. Any part used roll can be re-wrapped and can be re-used if it has been protected in plastic to

prevent moisture loss or saturation from rainfall.

INSTALLATION

All projects must be assessed on an individual basis as installation details may differ. For project specific recommendations

contact the Technical Department at Rawell. Installation may continue during light rainfall providing the backfilling process

continues until all of the RAWMAT® HDB Type PP2 is covered with the correct depth (300mm) of protective layer.

The surface onto which the RAWMAT® HDB Type PP2 is to be laid should be compacted to provide a firm smooth surface free

of all ruts, sharp objects, roots, debris, and stones larger than 10mm. The unrolling and placement of RAWMAT® HDB PP2

should be performed in such a way that the membrane is not damaged, stretched, folded or creased.

Non-woven polypropylene geotextile

Non-woven polypropylene geotextile

RAWMAT® HDB




DATA SHEET


RAWMAT® HDB


The RAWMAT® HDB Type PP2 is to be laid onto the bund floor, butt the leading edge to the

concrete wall and roll out across the bund. At the wall, peel back the top white geotextile a

minimum of 150mm exposing the clay core. Apply Rawpaste Mastic TF to the clay core and

150mm up the vertical face of the wall. Take lengths of Rawseal TR35 fillet and bed them

into the Rawpaste Mastic TF butt jointing to form a continuous length of fillet.

Apply a pre-cut strip (minimum 333mm wide) of RAWMAT® HDB Type P1 with the black side

down so that it covers the Rawseal TR35 an laps equally to the wall and onto the clay core of

the membrane. Fold the previously peeled back white geotextile back over the new strip.

Using a Hilti DS460 gun fix a PVC termination bar 25mm wide by 4mm thick through the top

of the RAWMAT® HDB Type P1 strip to ensure the membrane is fixed firmly in place. Using a

sharp utility knife, trim the membrane back to a level line around the circumference of the

site. Use this method of fixing to any concrete upstand, pipe support or stair plinth across

the bund.

Continue rolling out the rolls across the floor of the bund. The overlaps are created by

peeling back the upper geotextile and the clay core on the first sheet of RAWMAT® HDB Type

PP2 by 150mm (to the lap line) exposing the lower geotextile. The second sheet of RAWMAT®

HDB Type PP2 is then laid onto the previously exposed geotextile and the upper geotextile is

peeled back by 150mm (to the lap line).

Apply a 2mm thick layer of RAWPASTE Mastic onto the exposed clay core and fold the clay

core and upper geotextile of the original sheet of RAWMAT® HDB Type PP2 onto the clay core

covered with RAWPASTE Mastic. Press the two sheets firmly together and fold the upper

geotextile from the second sheet of RAWMAT® HDB Type PP2 back over the top (See detail

opposite).

Great care must be taken to ensure that the correct procedure for overlapping the rolls is

followed. Under no circumstances shall the geotextile be contained within the lap.

At no time during installation of the RAWMAT® HDB Type PP2 or placing of the protective

layer will plant or machinery be permitted to travel on the unprotected surface of the

RAWMAT® HDB Type PP2. Any machinery must travel on the protective layer.

As the membrane is being installed and all overlaps and penetrations are being sealed the

membrane must be covered as part of the on going installation process. However, before the

end of the working day all exposed membrane should be covered with the required 300mm

depth of cover. The leading edge can be protected at the end of each day by temporally

wrapping 200mm of membrane in polythene sheeting, this can be removed the following day

when the next sheets of membrane are installed.

An optional addition to the system is the introduction of the Rawdrain drainage composite

over the RAWMAT® HDB Type PP2 membrane. The Rawdrain comes in different sizes and

flow rates, the Rawdrain helps to effectively collect liquid contained within the bund and take

it to sumps and drains for collection and removal. Use of the Rawdrain also provides greater

protection to the RAWMAT® HDB Type PP2 membrane and means less selection is required of

the backfill placed over the membrane.

DATA SHEET RAWMAT HD - StocExpo

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