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8/10/2019 Opus Concrete for Art 2009 2
1/4
Concrete
or
a
t
Rarnnuruo
ennHn^
Concreteechnology
t the
musicians' ouse
at lnselHombroich
The manufactureof aesthetic air-facedconcretewith a
perfect
surface
represents challengeeven under
normal conditions.However,he condi-
tions at
Insel Hombroich raised his craftsmanship o a work of art. A
musicians' ouse was built on the site of the
former rocket station near
Neuss n WesternCermanyaccordingo the
plans
by he New Yorkarchitect
RaimundAbrahamand deserves
espect
n terms of both architecture nd
bui ld ing echnology.
(u
S-
5
'{-,
tJ
(U
E
l;
-lr
TJ
L-
rc
The estate agent
and art lover Karl-Heinrich
Mller
(1936-2007)
had
the
vision many
years
ago of
a
place
where
artists
from all
genres
could live and
work. He
put
this
idea into
practice
with
the
'Stiftung
Insel
Hombroich' (Hombroich Island Trust). As part of this
idea, the building by
the New York architect
Raimund
Abraham is dedicated
o musicians.The building
was
presented
as long ago as 1996 at the
Biannual Inter-
national
Architecture Exhibition in Venice.
However, it
was to be another ten
years
before building
work
began.
During that time the
project passed
through
several
planning
processes
that
were
accompanied
creatively by the builder.
Today, four
apartments, a
large common room, a music library and a recording
studio
are
planned
in
the steel
reinforced concrete
Groundsection
q,
\
g
Er
o
a
S
a,
I
n
o
opusC I z.zoo9
30
8/10/2019 Opus Concrete for Art 2009 2
2/4
b._
.
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-qryFi.:
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8/10/2019 Opus Concrete for Art 2009 2
3/4
respective
pouring
situation. All three
types
of
concrete
were
of consistency lass
F3, i.e. they
were
soft to plasticand did not flow. Over and above hat, a
wire mesh mountedat right angles o the
direction of
flow
prevented
the concrete
from slipping on the
strongly inclined
formwork. The architect s design
envisaged slab
with a thickness f almost50
cm. In
order
to reduce the
weight
of
the concrete disc,
spherical
plastic
hollow bodies
(Cobiax)
with
a
diameterof approx.
25 cm
were
ntegrated
n
the
con-
crete
slab.There ask
s
to create
argeair chambers
n
the concrete
where
statics
allow. Due to their
low
gross
density, however, the
hollow
bodies
act like
buoys and
loat
to the
surface. n order o
prevent
his,
the
manufacturerdelivered the balls
in reinforcing
cages,with the aid of which it was possible o mount
them
in the desired
position.
For
the
musicians house
these steel cages
were concreted n a 15 cm thick
concrete ayer and in this
way fixed. The 30 cm thick
concrete
pouring
above that completely
encases he
plastic
hollow
bodies.
The whole thing is topped off
by a 9 cm thick covering ayer. Polypropylene ibres
have been added to this
layer in
order
to
prevent
shrinkagecracks
as
the concretesets.
n order that the
concrete should
have an aesthetically appealing
appearance,t was he architect s
ish
that all surfaces
should
have
a uniform
colour. n addition o numerous
other
factors, t is in
particular
he sand added o the
mixture that
plays
a decisive
part
in the colour of the
concrete.
However,
sand
is a natural
product
and
varies in
colour, dependingon
its origin. Given the
construction
eriod
of l5
months, t therefore ppeared
to
those responsible o be a
good
idea to stockpile
sufficient
quantities
of sand.A total of
1500 metric
tons of the aggregatewere stored and used in the
preparation
of the concrete.On top of that,
the
experts
from
Heidelberger Beton
chose
an iron Portland
cement
CEM
II/A-S 42.5 R) as he binding agent.
opusC I z.zoo9
32
8/10/2019 Opus Concrete for Art 2009 2
4/4
Lnve
BY AyER
Multi-layer
slzrb
onstructions
re
nothing
or-rt f
the
ordinary
in concrete
buildin-e ractice.
n
order
to
manufacture
monoli thic
slab
using
his
construction
method.
a force-locked
onnection
etween
he indi-
vidual
ayers
s necessary.
he
easiest
ay
to
achieve
this s
to apply
he
concrete
resh-in-fresh.
his
entai ls
pouring
the next
layer
of concrete
onto
the
previous
layer
before
it has
set.
However,
n the
case
of
the
musicians'
ouse
his wns
not
continuously
ossible.
So that
the arti f icial
stone
would
be sol id
enough
o
allow
the hollow
bodies
o
be fixed,
the
employees
from
Heidelberger
Beton
recommended
hat
a
period
of
two dzrys
e allowed
between
he
first layer
ancl
he
subsequent
ouring
processes.
nly
then
could
th e
second
oncrete
ayer
be
poured.
This
contained
a re-
tarder, .e. erchemical hat slows down the concrete
setting process.
As
a result
of
this, the
building
workers
had
sufTicient
ime
to
pour
the final
layer
on
the
sti l l fresh
concrete.
The
monolithic
slab
thus
created
was
subsequently
reated
using
special
_erind-
in_e
achines,
o-cal led ower
rowels.
g
Architecture
Prof .
ip l . - lng.
a imund
braham,
ew
York
Vienna
Structural
ngineering
Dip l . - lng. ors tKappauf
Construction
ite
management
Andreas
i tpass
nd
Susanne
chwingen-Hi tpass
rch i tek ten
Stockka pstra
e.
8
40477
Dsseldorf
Cermany
T +49
zn
46959328
Concrete
Heide lbergCement
C
Ber l iner
t rae
69rzo
Heide lberg
Germany
T +49
6zz1
48l
g48l,F
+49
6zzt
48r
954o
www
heidel
ergcement.com/de
Heide lberger
etonNordwest mbH
Co.KC,
Cebiet
Rhein land
Max-Planck-itr.
z
5o858
Kln-Marsdor f
Cermany
T +49
2234
9993
o,F
+49
2234
gg3
11o
Formwork
echnology
Deutsche
oka
Schalungstechnik
mbH
Frauenst rae
35,
D-8zzr6
Maisach
T
+49
8t4t
394o,F
+49
8t4t
3946t83
Deutsche.Doka
doka.de
www.doka.com
Void
plastic
ormers
echnology
Cobiax
echnologies
mbH
Heide lberger
t rasse
-8
64283Darmstadt Cermany
T
+49
6t5l
9t
816
oo, F
+49
6.t5.r
t
8t6 zz
i
nfo.ge
ma
ny@co
iax.com
www.cobiax.com
33
opus
C I
z .zoog