international
construction
november 2014
ROADBUILDING
28
Project pressures
Emissions and fuel savings
Atlas Copco’s large pavers have been fittedwith Stage IV engines
A
tlas Copco has updated its large paver rangewith new engines that complywith
Stage IV/Tier 4 Final emissions regulations in Europe, Japan and theUS. The
company says that annual fuel savings could add up to 4,200 litres per year, which
means an 11 tonne reduction inCO
2
aswell as a cut in the pollutants targeted by the
legislation.
Atlas Copco uses a diesel oxidation catalyst (DOC) and selective catalytic reduction (SCR)
to achieve emissions compliance, and has alsomade new updates to other aspects of its
pavers.
The SD2550CS has a new dashboardwhich has been ergonomically positioned and
designedwith easy to understand analogue signs in a digital display. Toggle switchesmake
life easier for operatorswearing gloves.
The SD2550CS is suitable for highway paving up to 14m, with a
theoretical production capacity of 1,100 tonnes per hour. It comes
with a15 tonne capacity hopper, awidematerial tunnel and 500
mm diameter auger. Screed choices include the V5100/6000 TVE
(tamper vibration) screeds, V5100/6000TVH (high compaction)
screeds aswell as theR300TVE rigid screed.
Another interesting feature is the VarioSpeed option
which recognises the engine revs required for any
given task and adjust the speed
accordingly. Atlas Copco says
this could save up to 15% in
fuel costs aswell as reducing
unnecessarywear on the
machine.
first, which was no problem for the
versatile 3800CR.
Once this was out of the way, the task
of recycling to a depthof 100mmbegan,
with themilledmaterial beingmixed as it
was cut in a single pass with a pre-spread
layer of cement binder.
Water and bitumen emulsion – foamed
bitumen – were injected into the 3800
CR mixing chamber via injection bars
from a water and binding agent tanker
travelling in front of the machine.
Once mixed, the conveyor transferred
the material to the Vision 5200-2 paver
for laying and pre-compaction as a new
course.
Mark Stahl, vice president for operations at Dunn Company
said, “Cold in-place recycling (CIR) is a good complement to
traditional constructionmethods. By re-usingmaterials in-place
for the intermediate layer, we help the wearing courses perform
better while reducing the time, cost and environmental impact
of projects. That benefits agencies as well as the taxpaying
public”.
The jobwas successfully completed in time.Thiswas naturally
not only great news for Dunn‘s client, but the contractor also
profited from the prompt completion of the project, and the
next job is already lined up for the 3800CR – this time not in
cold recycling, but inmilling.
Recyclingwork
In a similar application, Brown Brown, a road building
contractor, in Santa Teresinha in the state of Bahia, Brazil has
completed rehabilitationwork on portions of highway BR-381
from Sao Paulo to Belo Horizonte. The company worked
with technical staff from equipment supplier
Roadtec to carry out the work with a cold in-
place recycling (CIR) process tailored for the
tropical climates and for roadways with heavy
traffic.
The equipment train for this consisted of a water truck in
>
Nebraska-based contractor Paulsen
achieved advance rates of more
than 1.5 km per day on a local
resurfacing job using a GOMACO
two-track GP-2400 paver fittedwith
a Leica Geosystems 3D guidance
system.
Hilkiyahu is using a 65 tonne class Hitachi ZX670LCH-5
to help excavate and load 1.5millionm
3
of materials on
the upgraded of a 13 km stretch of Israels’ Road 65.
The company has praised themachine’s productivity,
stability and operator visibility.
