french institute of science and technology for transport ... - Ifsttar

Research orientation W_Conserving energy and natural resources
The environmental balance
sheet of roads
Innovative low temperature coating technology
IFSTTAR is studying possible improvements in construction
standards prior to their implementation in
partnership with public sector project managers and
infrastructure owners active in the area of roads (SETRA,
Département General Councils) and a number of road
construction companies.
The aim is to optimize the environmental balance sheet
of roads. Reducing the consumption of resources – aggregate,
binders and energy – is of prime importance in this area, and
has been particularly studied, with specifications (a recycling
rate between 10 and 35%) and measurements relating to a
variety of impacts such as the greenhouse effect, acidification
and eutrophization. In the case of pavements, these coating
techniques provide substantial environmental benefits (several
tens of percent) for several indicators, placing innovation in
the area of materials and their manufacture at the centre of
environmental optimization.
This research combines two aspects that complement each
other, full-scale trials and impact modelling. This enables our
environmental evaluation to quantify the most important parameters
on the basis of data from a dedicated construction
site and take account of this in future calculations that pertain
to the different phases of the life cycle of infrastructures.
@ CONTACTS
denis.francois@ifsttar.fr & agnes.jullien@ifsttar.fr
A mixing plant belonging to the contractor
Brajat – Trial CG26.
37
Compacted
fibre-reinforced
concrete of hightraffic
pavements
The fatigue test track
For more than a decade various techniques for recycling
asphalt planings have been tested, including treatment
with hydraulic binders.
In this case, the addition of a small amount of metal
fibre reinforcement substantially improves the mechanical
performance of the material, giving a new life to asphalt that
is suffering from fatigue. This technology, which is known as
FRCC (Fibre-Reinforced Roller Compacted Concrete) is covered
by a European patent. The four-year ANR Recyroute (1) ,
which got under way in April 2008, sets out to assess the
environmental and economic performance of FRCC made
with new aggregate or asphalt planings that have been treated
with a hydraulic binder as a composite material for high traffic
pavements.
(1) The €M 2.3 ANR Recyroute project brings together three partners from
the private sector (EIFFAGE Travaux Publics, APRR and CTI), and four
partners from the public sector –IFSTTAR, CETE Île-de-France, ENTPE and
the City of Paris). It has been certified by the Advancity Ville et Mobilité
Durables competitiveness cluster.
Construction of RECYROUTE structures on the
Ifsttar pavement fatigue carousel.
ANNUAL REPORT 2011 ifsttar.fr