Concrete-concrete composites can be subdivided into structures with different concrete over the structure cross section, combination of precast and in-situ concrete and combinations of the two.
4.3.1 Precast Concrete Formwork with In-situ Concrete Top Cast
A very common slab solution is a combination of precast concrete formwork and in-situ concrete. In Norway this kind of system is delivered by Con-Form and Unicon among others.
This system is based on precast slabs with lattice girder reinforcement which acts like formwork in the construction phase. A typical example of precast concrete formwork is shown in Fig. 7.
4. Hybrid Concrete Structures
12
The main tension
lattice girder reinforcement The girder
of the girder the structural reinfo layer is
cast has cured.
Since the top steel reinforcement only can take small pressure forces due to its dimension and slenderness, the concrete formwork requires
phase, unless the s during construction.
floor props
4. Hybrid Concrete Structures
The main tension and minimum transversal lattice girder reinforcement
The girder also stabilizes the slab during the construction phase and the top steel reinforcement of the girder takes the
the structural reinfo
layer is cast over the whole concrete formwork, turning it to a monolithic slab after the final cast has cured.
Fig.
Since the top steel reinforcement only can take small pressure forces due to its dimension and slenderness, the concrete formwork requires
phase, unless the s during construction.
floor props placed on the underlying deck. The 4. Hybrid Concrete Structures
Fig. 7: Typical
and minimum transversal lattice girder reinforcement acts like shear connect
also stabilizes the slab during the construction phase and the top steel reinforcement takes the compression
the structural reinforcement is put in place after the
over the whole concrete formwork, turning it to a monolithic slab after the final
Fig. 8: Installation of
Since the top steel reinforcement only can take small pressure forces due to its dimension and slenderness, the concrete formwork requires
phase, unless the spans are short. A typical 7m Con during construction. This is illustrated in
placed on the underlying deck. The : Typical precast
and minimum transversal acts like shear connect
also stabilizes the slab during the construction phase and the top steel reinforcement compression forces alone through the construction phase.
rcement is put in place after the
over the whole concrete formwork, turning it to a monolithic slab after the final
: Installation of precast
Since the top steel reinforcement only can take small pressure forces due to its dimension and slenderness, the concrete formwork requires
pans are short. A typical 7m Con This is illustrated in Fig.
placed on the underlying deck. The
precast concrete formwork
and minimum transversal reinforcement is located in the acts like shear connectors between the
also stabilizes the slab during the construction phase and the top steel reinforcement forces alone through the construction phase.
rcement is put in place after the precast
over the whole concrete formwork, turning it to a monolithic slab after the final
precast concrete formwork in Sweden
Since the top steel reinforcement only can take small pressure forces due to its dimension and slenderness, the concrete formwork requires temporary
pans are short. A typical 7m
also stabilizes the slab during the construction phase and the top steel reinforcement forces alone through the construction phase.
precast slabs are mounted. Finally the top over the whole concrete formwork, turning it to a monolithic slab after the final
formwork in Sweden
Since the top steel reinforcement only can take small pressure forces due to its dimension and temporary supports t
-form precast
. The support beams are usually supported by work with the temporary supports is a time
[12].
reinforcement is located in the precast ors between the precast and in
also stabilizes the slab during the construction phase and the top steel reinforcement forces alone through the construction phase.
slabs are mounted. Finally the top over the whole concrete formwork, turning it to a monolithic slab after the final
formwork in Sweden [13].
Since the top steel reinforcement only can take small pressure forces due to its dimension and supports through the construction cast slab requires 3 supports . The support beams are usually supported by work with the temporary supports is a time precast slab. The and in-situ layer.
also stabilizes the slab during the construction phase and the top steel reinforcement forces alone through the construction phase. The rest of
slabs are mounted. Finally the top over the whole concrete formwork, turning it to a monolithic slab after the final
Since the top steel reinforcement only can take small pressure forces due to its dimension and hrough the construction slab requires 3 supports . The support beams are usually supported by work with the temporary supports is a time slab. The situ layer.
also stabilizes the slab during the construction phase and the top steel reinforcement The rest of slabs are mounted. Finally the top over the whole concrete formwork, turning it to a monolithic slab after the final
Since the top steel reinforcement only can take small pressure forces due to its dimension and hrough the construction slab requires 3 supports . The support beams are usually supported by work with the temporary supports is a time
demanding job and solutions where the completely would save a lot of money.
Precast completely would save a lot of money.
Precast concrete formwork
up to 8.1m. The elements are purely o extra structural cast
a level cast on the very top behavior of the structure.
as shown in Fig.
Limitation in this system is the relatively low load capacit height of 250 mm
core slab, with height of 220 mm and 6 m span, which demanding job and solutions where the
completely would save a lot of money.
concrete formwork o extra structural cast is needed on the a level cast on the very top
behavior of the structure. Steel reinforcement is used both Fig. 9.
Fig. 9
in this system is the relatively low load capacit height of 250 mm can only
, with height of 220 mm and 6 m span, which demanding job and solutions where the
completely would save a lot of money.
concrete formwork is usually delivered in widths up to 2.4m and spans up to 7.2 pans up to 12m
s of slabs can be desi usually related to serviceability aspects
ECA Byggeplank
k is delivered as construction elements The elements are purely precast
is needed on the
a level cast on the very top which will increase the capacity somewhat, due to monolithic Steel reinforcement is used both
9: Principles of
in this system is the relatively low load capacit can only carry a little over 5 kN/m , with height of 220 mm and 6 m span, which
demanding job and solutions where the amount of supports could be reduce
y delivered in widths up to 2.4m and spans up to 7.2 pans up to 12m can be delivered
be designed to r
of crack width and maximum displacement.
Byggeplank
as construction elements
precast and are lifted into place at the construction site.
is needed on the LECA Byggeplank. However, it is not uncommon to do which will increase the capacity somewhat, due to monolithic Steel reinforcement is used both
: Principles of Weber's Leca Byggeplank 250T
in this system is the relatively low load capacit a little over 5 kN/m , with height of 220 mm and 6 m span, which
amount of supports could be reduce
y delivered in widths up to 2.4m and spans up to 7.2 delivered when
ed to resist very large loads, with of crack width and maximum displacement.
as construction elements with
and are lifted into place at the construction site.
Byggeplank. However, it is not uncommon to do which will increase the capacity somewhat, due to monolithic Steel reinforcement is used both in the tensi
's Leca Byggeplank 250T
in this system is the relatively low load capacity. As an example a little over 5 kN/m2 [15]. This can be , with height of 220 mm and 6 m span, which can carry up
amount of supports could be reduce
y delivered in widths up to 2.4m and spans up to 7.2 when pre stressed
esist very large loads, with of crack width and maximum displacement.
with widths of 0.6m
and are lifted into place at the construction site.
Byggeplank. However, it is not uncommon to do which will increase the capacity somewhat, due to monolithic
the tensile and
's Leca Byggeplank 250T [15].
. As an example the
. This can be compared to a hollow can carry up to 18kN/m
amount of supports could be reduced partly or
y delivered in widths up to 2.4m and spans up to 7.2
pre stressed reinforcement is esist very large loads, with limitations of crack width and maximum displacement.
widths of 0.6m and in lengths and are lifted into place at the construction site.
Byggeplank. However, it is not uncommon to do which will increase the capacity somewhat, due to monolithic
y delivered in widths up to 2.4m and spans up to 7.2m with reinforcement is imitations
and in lengths and are lifted into place at the construction site.
Byggeplank. However, it is not uncommon to do which will increase the capacity somewhat, due to monolithic compressive zone
6 m element with compared to a hollow