The document discusses precast concrete construction. Some key points: - Precast concrete components are cast off-site in a controlled environment and transported to the construction site for assembly. This allows for standardized, mass produced elements. - Large precast concrete panels form the walls and floors, connecting vertically and horizontally. When joined, they form a rigid box structure that transfers lateral loads. - Connections between precast elements can be either dry joints using bolts/welds, or monolithic placement with concrete poured to join components.

2.  Concrete members which
have been formed, cast, and
cured prior to final placement
in a structure.

3.  Complete thermal protection.
 Effective rain screens .
 Superior lifespan.
 Numerous finish options and colours .

4. Precast concrete wall
Precast concrete frame

5. Precast concrete floor
Precast concrete columns
and beams

6.  Liquid material is poured in
forms at the building site.

7. Cast-in-situ foundation
Cast-in-situ wall

8.  Cast-in-situ concrete has less strength as compared to
precast concrete.

9. The concept of precast construction includes those
buildings where the majority of structural
components are standardized and produced in
plants in a location away from the building, and then
transported to the site for assembly. These
components are manufactured by industrial methods
based on mass production in order to build large
number of buildings in a short time at low cost

10. The desig atio large-pa el syste refers to ultistory
structures composed of large wall and floor concrete panels
connected in the vertical and horizontal directions so that the wall
panels enclose appropriate spaces for the rooms within a building.
These panels form a box-like structure .Both vertical and horizontal
panels resist gravity load.

11. Wall panels are usually one story high. Horizontal floor and roof
panels span either as one-way or two-way slabs. When properly
joined together, these horizontal elements
act as diaphragms that transfer the lateral loads to the walls

12. Dry joints are constructed by
bolting or welding together
steel plates or other steel
inserts cast into the ends of
the precast panels for this
purpose . The force transfer in
structures with dry joints is
accomplished at discrete
points.

13. Frame Systems
Precast frames can be constructed using either linear elements or spatial
beam-column sub assemblages. The use of linear elements generally
means placing the connecting faces at the beam-column junctions. The
beams can be seated on corbels at the columns, for ease of construction
and to aid the shear transfer from the beam to the column.
The beam-column joints
accomplished in this way
are hinged.

14. Precast planks are
installed in place .

16.  NEW DELHI
 MUMBAI
 INDORE
 AHMEDABAD
 NASHIK
 GHAZIABAD
 MEERUT
 GURGAON
 KOLKATA

17. The general process flow
with cast in site
Construction starts with
formwork and
Reinforcement being
prepared and erected.
Both form work and
reinforcement need to
be in place before any
concrete related activity
can begun.

18. Usually within a few days , the concrete is strong enough to
support its design load and the formwork can be removed to
be used elsewhere on the site.
Re-shoring is used to replace the formwork and continue to
support the concrete while construction loads are applied
to it .

20. Monolithic concrete
placement is when
concrete is
deposited in one
large formwork
system which is
made up of several
smaller formwork
systems each
corresponding to a
different concrete
member

22. Concrete
curing is the
period of time
directly
following
concrete
placement ,
during which
freshly placed
concrete
strengthens
and hardens ,

24.  Precast structures can be reused, extended and
refitted internally. Structures do not need to be
demolished and can simply be renovated internally
conserving resources, reducing waste and landfill.
 Precast is easy to keep clean, requiring minimum
maintenance.
 Precast concrete can be moulded into almost any
form and finish. Careful design of precast concrete
buildings increases the likelihood of reusing the
building over again.

25.  Precast co crete does ’t shri k, distort or o e a d does
not deteriorate with exposure to climatic change.
 Being flood resistant, precast concrete does not erode or rot
therefore is suitable for river and coastal barriers to protect
against high tides and storms.
 As a hardy waterproof construction method, precast
concrete underground pipes transport sewerage and clean
water across the country.

26.  Concrete is ordered and placed as
needed and does not need to be
trimmed or cut after installation.
 Wash water is frequently recycled
using trucks equipped with devices
that collect wash water and return it
to the drum where it can be
returned to the ready mixed
concrete plant for recycling.
 Extra concrete is often returned to
the ready-mix plant where it is
recycled or used to make jersey
barriers or retaining wall blocks so it
does ’t gets asted

27.  Or it can be washed to recycle
the coarse aggregate. Special set
retarding admixtures can be
added to returned concrete to
allow for storage and future use.
 It reduces the heat island affect.
When used for exposed
horizontal surfaces

28. ADVANTAGES DISADVANTAGES
 Entire building can be
precast-walls,floors,beams
etc.
 High quality.
 Flexibility in use.
 More durable than real
masonry.
 Optimum use of materials.
 Protection of
environment.
 Very heavy members.
 Camber in beams and
columns.
 Connections may be difficult.
 Somewhat limited building
design.
 Joints between panels are
often expensive and
complicated.
 Cranes are required to lift
panels.

29. ADVANTAGES DISADVANTAGES
 Limitless flexibility of
shape and size.
 Wide variety of surface
and textures can be
achieved.
 Homogeneous
connections.
 Needs high labour and
plant on site.
 Formwork is time
consuming.
 Quality control is difficult.

30. Precast Construction

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