Conventional mastic asphalts are produced and laid at a temperature of 230°C to 250°C. In order to reduce the pollution caused by fumes, Eurovia developed Viasphalt® BT, which is produced at a lower temperature, generating substantial energy savings, and eliminates virtually all fume emissions at the worksite while retaining the specifications of mastic asphalt. Viasphalt® BT is one of the many innovations developed by Eurovia as part of its ongoing commitment to environmental protection and sustainable development.

1. WARM MASTIC ASPHALT
VIASPHALT BT
Performance and comfort
®

2. VIASPHALT® BT
WARM MASTIC ASPHALT
Conventional mastic asphalts are produced and laid at a temperature of 230°C to 250°C. In order
to reduce the pollution caused by fumes, Eurovia developed Viasphalt® BT, which is produced at
a lower temperature, generating substantial energy savings, and eliminates virtually all fume
emissions at the worksite while retaining the specifications of mastic asphalt.
Viasphalt® BT is one of the many innovations developed by Eurovia as part of its ongoing
commitment to environmental protection and sustainable development.
key
Benefits
key
figures
R
eduction of thermal shrinkage
W
orkability maintained
60°C reduction
in production temperature
E
nergy savings during production
V
irtually no pollution for local
residents and laying teams
Energy savings
of over
30%
Fume emission
close to 0

3. innovation for
A SUSTAINABLE CITY
Viasphalt® BT contains a specific plant-based additive
that is renewable, recyclable and harmless to humans
and the environment. It lends the mastic asphalt
mechanical properties that are identical or in certain
cases superior to those of conventional materials.
Viasphalt® BT is suitable for conventional mastic
asphalt applications:
waterproofing
car parks
sidewalks
pavements.
MAXIMUM
WORKABILITY
AND SIMPLICITY
The natural additive injected into the bitumen during
mixing increases the workability of the mastic asphalt
mix and lowers its production temperature by 60°C to
the temperature required for the production of hot mix.
Workability during laying is maintained down to a
temperature of about 150°C, i.e. 90°C below the
conventional mastic asphalt application temperature.
The mix is applied manually or by machine, depending
on the type of works.
BETTER PROTECTION
FOR LOCAL
RESIDENTS AND
EMPLOYEES
Reducing temperatures eliminates
fume emissions, which improves
working conditions for laying
teams and enables Viasphalt® BT
to be laid in confined spaces (car
parks, underground levels) without
special fume venting systems. This
substantially improves the immediate
mastic asphalt worksite environment,
especially for local residents.
effective
ACROSS THE BOARD
With a few adaptations, a
conventional mixing plant can be
used to manufacture the product.
This reduces transport distances
between production and application
sites. Viasphalt® BT is transported in a
mobile pug mill, of a size appropriate
to the project, in which the product’s
temperature and homogeneity can be
controlled.

4. performance,
A MATTER OF STANDARDS
Viasphalt® BT has a grading of 0/4 to 0/10 mm,
depending on the application, and uses a
pure 35/50 bitumen. A harder grade bitumen
with additive may be used to improve traffic
performance in the case of mastic asphalts used in
pavements.
The properties of Viasphalt BT meet the
specifications of the EN 13108-6 standard. The
additive does not adversely affect the mechanical
performance or the durability of the surfacing.
Shrinkage properties are better than those of a
conventional mastic asphalt.
In the example shown below, the performance
of Viasphalt® BT is compared to these of a
conventional AG3 (bridge waterproofing) type
mastic asphalt:
Mastic
asphalt
Viasphalt® BT
Production
temperature
230°C
170°C
EN 12697-21
Indentation
(1/10 mm)
21
19
15 - 40
Shrinkage (mm)
1.1
0.6
-
Cubic
expansion
coefficient
(mdef/°C)
28
30
-
Specification
The power needed to knead the product is
reduced as soon as the additive is introduced
into the Viasphalt® BT heated to approximately
170°C, ensuring laying quality comparable to
that of a conventional mastic asphalt. This
phenomenon accounts for the energy savings.
Viasphalt® is a registered trademark.
TECHNICAL DEPARTMENT
18, place de l’Europe - 92565 Rueil-Malmaison cedex
Tel.: +33 1 47 16 38 00 - Fax: +33 1 47 16 38 01
www.eurovia.com
technique@eurovia.com
- August 2013 - 500 copies – Photos: Eurovia photo library
®