The 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.

1. ENGINEERING STRUCTURE WATERPROOFING
VIAPLaST
®
High-performance
waterproofing

2. VIAPLAST®
ENGINEERING STRUCTURE
WATERPROOFING
The 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.
k
ey benefits
k
ey figures
omplete absence of blistering
C
apid application
R
ew laying constraints
F
Surface course thickness
reduced by at least 25
mm
mmediate retrafficking
I
Over 10
years
of technical success
Nearly 200,000
laid worldwide
m2

3. AN UNRIVALLED
PROCess
Viaplast® is therefore a very suitable process for
waterproofing multi-storey car parks, due to its light
weight.
Viaplast® 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.
Viaplast® is a new and exceptionally effective process
that broadens the Eurovia range of waterproofing
techniques.
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.)
a few major
projects
harilaos Trikoupis Bridge in Greece
C
aine viaduct (A11 motorway)
M
lermont Ferrand light rail
C
laubert bridge in Rouen
F

4. 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 nonadhesive 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.
Characteristics
3.5 kg/m2
2.5 mm
1m
11 cm
10 m
Mass per unit area
Nominal thickness
Roll width
Width of welding strips
Length of standard roll
* Excluding thickness of adhesive lines.
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.
SE
COND 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.
Surface course
0/6 microconcrete
thickness = 25 mm
Self-adhesive strip
}
Viaplast®
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
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
- May 2011 - photos credit : photolibrary Eurovia
f
irst layer