VIAPLAST ®

eNGiNeeriNG strUCtUre WaterPrOOfiNG

High-performance waterproofing

key beNefits

Complete absence of blistering

Rapid application

Few laying constraints

Immediate retrafficking

key fiGUres

Over 10 yearsof technical success

Surface course thickness reduced by at least 25 mm

Nearly 200,000 m2

laid worldwide

ViaPlast®

eNGiNeeriNG strUCtUre WaterPrOOfiNGThe role of engineering structure waterproofing is to protect the deck and structure from

the corrosive effects of zenithal water, which may also contain aggressive products such as

decicing salts used on pavements in winter.

Laying a waterproof screen on a concrete deck can sometimes produce unwanted side effects.

Because of the microporosity of the concrete, air and water can become trapped under the

waterproofing and air and steam escaping from the concrete can produce blistering that can

damage the waterproofing and the surface course.

The new Viaplast® process developed by Eurovia eliminates the risk of blistering and can be

applied at high output rates.

aN UNriValleD PrOCessViaplast® is a one-of-a-kind product that has revolutionised concrete road bridge waterproofing. It uses a self-adhesive sheet that is applied at high speed and prevents the appearance of blistering. The absence of blistering, even when the uncoated layer remains exposed to the sun, has been demonstrated in all projects carried out to date.

Laying output rates are substantially higher than those of hot-welded sheets. The complex can be re-trafficked before the final surface course is laid, which reduces lead times and worksite constraints.

Thanks to the presence of the sand asphalt and the absence of blistering risk, the surface course thickness can be reduced:

> 45 mm for > T2 traffic (200 trucks/day)

> 25 mm for light traffic

(A conventional single-layer adhesive waterproofing must be overlaid with at least 70 mm of asphalt mix.)

Viaplast® is therefore a very suitable process for waterproofing multi-storey car parks, due to its light weight.

Viaplast® is a new and exceptionally effective process that broadens the Eurovia range of waterproofing techniques.

a feW majOr PrOjeCts

> Charilaos Trikoupis Bridge in Greece

> Maine viaduct (A11 motorway)

> Clermont Ferrand light rail

> Flaubert bridge in Rouen

TECHNICAL DEPARTMENT

18, place de l’Europe - 92565 Rueil-Malmaison Cedex

Tel. : 33 (0)1 47 16 38 00 - Fax : 33 (0)1 47 16 38 01

www.eurovia.com

technique@eurovia.com

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first layer

The Viaplast® complex is made up of a fillerised elastomeric bitumen reinforced with a non-woven polyester fabric. The upper surface is sanded and covered with crepe paper, which can be peeled off. Cold adhesive elastomeric bitumen strips are attached to the underside. These calibrated discontinuous strips are separated by non-adhesive film zones. A siliconed film, which is removed during laying, protects the underside as a whole.

The complex is laid cold in a semi-adhesive process. This allows for high laying speeds and avoids the blistering that can occur with overall adhesion.

Substrate preparation – sweeping, pressurised water cleaning, cold priming – is the same as for a conventional adhesive membrane. Flashing is installed conventionally by welding a Hydroplast® type membrane. The joints at the end of the engineering structure and at roll ends must be completely closed by full-surface welding to avoid unwanted water ingress through the parts of the waterproofing that do not adhere to the deck.

seCOND layer

Viaplast® microconcrete owes its mechanical properties to the binder used, which can be pure or contain an additive,“Additive R”, which is added into the mixer. For a continuous mixing plant, the binder can be prepared by mixing Additive R into the bitumen during binder production (Liant R® binder).The additive makes it possible to produce an asphalt mix with high binder content, low voids content (< 6%) and therefore low permeability coefficient, with no risk of rutting. The microconcrete is laid at high output rates using conventional laying equipment.

Characteristics

Mass per unit area 3.5 kg/m2

Nominal thickness 2.5 mmRoll width 1 mWidth of welding strips 11 cmLength of standard roll 10 m

* Excluding thickness of adhesive lines.

A Technical Opinion was issued for Hydroplast® and renewed in 2004.

A Technical Opinion was issued for Viaplast® in 2002.

Hydroplast® and Viaplast® are registered trademarks.

Concrete with cold primer dressing

0/6 microconcrete thickness = 25 mmSelf-adhesive strip

Surface course

Viaplast®}