The 4h pumping of Neufahrn: Large boom team places ... - Putzmeister

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In 24 hours, a total of approx. 2,000 m 3 of
concrete C40/50 was placed with a compressive
strength of 42.5 N/mm 2 (exposition
classes XC4, XD1, XF2). This is the quantity
of concrete for the entire cross-section of the
structure of section 1 including footbridges
and carriageway slabs (see the box containing
data about the concreting). The complete
superstructure (sections 1 and 2) will
contain 3,400 m 3 of concrete.
So that traffi c can ultimately travel on the
road comfortably and safely, the fi nished
concrete surface receives another 8 cm thick
layer to the overall construction. The concrete
is fi rst primed and completely sealed
using epoxy resin. An asphalt sheeting (0.5
cm) comes next and then a protective layer
of mastic asphalt (3.5 cm thick). Finally, the
surface of the road is formed by a 4.0 cm
surface layer of stone mastic asphalt. n
Technical data of the concrete pumps on site
M 58-5 M 6 -6
Folding type 5-Arm roll-Z-fold 6-Arm roll-Z-fold
Vertical reach 57.6 m 61.1 m
Horizontal reach 53.6 m gross 57.1 m gross
49.4 m net 52.4 m net
Reach depth 42.4 m 44.3 m
Unfolding height 12.3 m 23 m
Delivery line DN 125, max. 85 bar Arm 1, 2 DN 125, max. 85 bar
Arm 3, 4, 5, 6 DN 117, max. 85 bar
Support width front / rear front / rear
normal approx. 11.1 m / approx. 11.5 m approx. 12.1 m / approx. 12.3 m
OSS approx. 8.7 m / approx. 8.0 m approx. 8.8 m / approx. 8.3 m
Properties of fresh concrete
Strength class C40/50
q In the middle of the motorway but nevertheless secure: The concreting is carried
out quietly while the traffi c can fl ow freely under the bridge construction.
This photo shows the M 58-5 on the north-eastern ramp.
12 13
Exposition classes XC4 Changing wet and dry (e.g. exterior components with direct
exposure to rainfall, components in water tidal zones)
XD1 Moderate moisture (e.g. components in areas where water
may spray from traffi c areas)
XF2 Moderate water saturation with de-icing agents (e.g. concrete
components in areas where water may spray from traffi c
areas that have been treated with de-icing agents)
t To determine the water content, the
concrete is heated up until it no longer
contains any liquid.The difference in
weight can be used to determine the
water content.
8 PM 4356 GB PM 4356 GB 9
Steel used
Untensioned reinforced steel 280 t Prestressing steel 107 t
Thickness of the layer of placed concrete
in the area of the webs 2.40 m in the centre of the carriageway 0.35 cm
q After a quick clean, the truck mixers
rejoin the queue of motorway traffi c in
order to fetch more concrete
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‚ Exposition classes
and what they mean
To ensure that the durability is suffi cient,
concrete components must be strong
enough to withstand chemical and physical
impact on their environment and
their use. The impacts from the various
environmental conditions are classifi ed
into exposition classes that may have an
impact on the concrete, the reinforcing
steel and metallic components and that
are not accounted for as loads during
the constructive assessment. From this,
the requirements are derived for the
composition of the concrete to be used,
as well as the concrete cover and the
permitted crack width.
The designations for the individual exposition
classes are made up of the letter
X (for exposition), the identifi cation
for the type of damaging effect and a
number that denotes the intensity of the
damaging effects. The following abbreviations
are used from English for the
various types of effects:
0 for zero risk (no risk of attack)
C for carbonation
D for de-icing salt (chlorides that are
capable of changing, e.g. from deicing
salt)
S for seawater
F for frost (frost and de-icing salt)
A for chemical attack
M for mechanical abrasion, wear, or
similar
The strength of the relevant ambient
condition is assigned a classifi cation
from 1 to 4.
In Germany, the exposition classes are
regulated by DIN 1045-1 (08-2008).
In contrast to the previous version from
2001, the effect W „concrete corrosion
due to alkali silicic acid“ has been added
to the exposition classes. No minimum
concrete strength class is assigned to
this exposition.
[Source: wikipedia.de, licensed under
http://creativecommons.org/licenses/by-sa/3.0/deed.de.]