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Advance Building Construction
CONCRETE CONSTRUCTIONS:
Pre stressed ,Pre cast & Light Weight
Yash Kotgirwar|114AR0032
PRE-STRESSED
CONCRETE
CONSTRUCTION
Pre Stressed Concrete
• A form of concrete that is ‘prestressed’ by being placed under compression prior to supporting any loads.
• Compression is produced by tensioning of high strength ‘tendons’ located within the concrete to improve the
performance
• Tendons may be single wire, multi wire strands or threaded bars
• Once the initial compression has been applied , the material has high strength when subjected to compressive
force and any tensile loading
• Improves structural capacity and serviceability as compared to conventional concrete
Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=znPVW9f2IoSCvQT-
hKsg&q=prestressed+concrete&oq=pre+stressed+co&gs_l=img.3.0.0i10k1l10.3005861.3010984.0.3012242.15.15.0.0.0.0.249.1942.0j8j2.10.0....0...1c.1.64.img..5.10.19
TYPES OF PRE STRESSING
PRE TENSIONING POST TENSIONING
Pre Tensioning
Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=ln_VW4_aNoOl9QPmvIuIDA&q=pre+tensioning&oq=pre+tensi
oning&gs_l=img.3..0j0i67k1j0l7j0i30k1.551052.553555.0.553834.14.14.0.0.0.0.372.2595.0j2j4j4.10.0....0...1c.1.64.img..4.10.2594...35i39k1j0i10i67k1j0i10k1.0.YNMw5
Pre Tensioning
Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=znPVW9f2IoSCvQT-
hKsg&q=prestressed+concrete&oq=pre+stressed+co&gs_l=img.3.0.0i10k1l10.3005861.3010984.0.3012242.15.15.0.0.0.0.249.1942.0j8j2.10.0....0...1c.1.64.img..5.10.19
Post Tensioning
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=ln_VW4_aNoOl9QPmvIuIDA&q=post+tensioning&oq=post+tensioni&g
s_l=img.3.0.0l10.426249.428963.0.430449.13.10.0.3.3.0.259.1521.0j6j2.8.0....0...1c.1.64.img..2.11.1544...35i39k1j0i67k1.0.2ztlTUzmM5A#imgrc=6RTdWHM9YWonGM:
Bonded Post Tensioning
Un-bonded Post tensioning
Applications in Buildings
• Longer spans for same structural depth
• Reduced Structural thickness
• Faster Stripping Time
• Reduced material cost
• Load balancing
• Varied Load bearing
Applications in Buildings
Capital Gate ,Abu Dhabi ICC Tower, Hong kong Ocean Heights,London
Source: Wikepedia/Pre stressed concrete
Other Uses
Source: Wikepedia/Pre stressed concrete
• Dams
• Bridges
• Silos and tanks
• Handstands and
pavements
• Nuclear blast
containment
structures
Incheon Bridge,South Korea
Wanapuran Dam,Washington
PRE-CAST CONCRETE
CONSTRUCTION
Plant Cast Cement Concrete
• Concrete elements ,casted and cured at plant and then transported to the site.
• Plant casting increases efficiency and quality control
• Durable and permanent steel forms used many times
• Reduce in formwork cost
• High early strength cement and steam curing allow concrete members to be casted and cured in 24 hours
Source:
https://www.google.co.in/search?q=pre+cast+concrete+factory&safe=active&rlz=1C1GGRV_enIN818IN818&source=lnms&tbm=isch&sa=X&ved=0ahUKEwis44PryqjeAh
UIuo8KHQs-DwUQ_AUIDygC#imgrc=yd6DLDSgh7_47M:
Plant Cast Cement Concrete
• Casting conditions, quality and surface finishes can be controlled
• Mostly either made by normal casting or pre-tensioning casting which may increase structural efficiency
• Conventional steel added to increase durability and resist stresses
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&q=precast+concrete+pretensioned&spell=1&sa=X&ved=0ahUKEwj2nrK0zKjeAh
XEvo8KHU49AWAQBQg9KAA#imgrc=6qY4OBAaRg6FiM:
Plant Cast Cement Concrete
• On site, precast concrete elements are lifted into place and assembled
• Compared to site cast, pre cast erection is faster and less affected by adverse weather condition
Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=D2PVW-
KTDJ6OvQSauY6IBQ&q=precast+concrete+site+assembling&oq=precast+concrete+site+assembling&gs_l=img.3...52631.56927.0.57257.19.18.0.0.0.0.249.2355.0j9j3.12.
0....0...1c.1.64.img..7.2.388...0.0.pjjOXePoLCo#imgrc=AzVQc1kgfH13GM:
PRE CAST , PRE STRESSED CONCRETE
STRUCTURAL ELEMENTS
Pre cast Concrete Slabs
• Used for floor and roof decks
• Available in different types as per loads design
Source:
https://www.google.co.in/search?safe=active
&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa
=1&ei=TWPVW9W0MYmWvQSRmJDIBg&q=
precast+concrete+slabs&oq=precast+concret
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=TWPVW9W0MYmWvQSRmJDIBg&q=precast+concrete+slabs&oq=precas
t+concrete+slabs&gs_l=img.3..0l9j0i30k1.549450.550480.0.550699.5.4.0.1.1.0.216.587.0j2j1
Pre cast Concrete Beams
and Girders
• Provide support for slabs
• Projecting reinforcing bars bond with concrete cast on site
• Picture showing inverted T beam supported by pre cast coulmns
Source:https://www.google.co.in/search?saf
e=active&rlz=1C1GGRV_enIN818IN818&tbm
=isch&sa=1&ei=eWXVW_GACcfovASPkaSoD
w&q=precast+concrete+beams+and+girders
&oq=precast+concrete+beams+and+girders&
gs_l=img.3...448343.452537.0.452795.22.21.
0.0.0.0.378.2964.0j8j5j1.14.0....0...1c.1.64.im
g..8.8.1835...0j35i39k1j0i67k1j0i
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=TWPVW9W0MYmWvQSRmJDIBg&q=precast+concrete+slabs&oq=precas
t+concrete+slabs&gs_l=img.3..0l9j0i30k1.549450.550480.0.550699.5.4.0.1.1.0.216.587.0j2j1
Pre cast Concrete Columns
and Wall Panels
• Provide support for beam and slab elements
• Mostly subjected to axial loading so can be
reinforced without prestressing
• Long slender elements can be pre casted to provide
resistance to bending forces during handling and
erection
• Wall panels can be solid or sandwiched with an
insulating layer
• These panels can be ribbed to increase verticality
while minimizing weight
Source:
https://www.google.co.in/search?safe=active
&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa
=1&ei=Q2fVW9qVDMjWvASGiKL4BA&q=prec
ast+concrete+walls+and+columns&oq=preca
st+concrete+walls+and+columns&gs_l=img.3.
..277861.285320.0.285490.18.17.1.0.0.0.230
.1768.0j6j3.9.0....0...1c.1.64.img..8.3.669...0j
0i24k1.0.0BrZrzDwgyg#imgrc=71uUrmgu92bl
vM:
Pre cast Concrete Elements
• Pre cast concrete stair
• Uniquely shaped structural elements for a sports stadium
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I
N818&tbm=isch&sa=1&ei=ZWjVW6y0B8bfvgSqiJ7ADw&q=precast+conc
rete+stairs&oq=precast+concrete+s&gs_l=img.3.1.0j0i67k1j0l8.554837.
Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm
=isch&sa=1&ei=mGrVW9qSBoncvgTE25joDw&q=precast+concrete+elemnts+for+stadium
&oq=precast+concrete+elemnts+for+stadium&gs_l=img.3...42845.49166.0.49475.21.21.0.
0.0.0.715.2855..
Assembly Concepts
• Vertical supports can be provided by combination
of pre cast beams, columns and wall panels
• Choice of roof and slabs depend upon load and
span
• Pre cast slab elements are frequently also used
with other vertical load bearing system such as
site cast concrete, reinforced masonry or steel.
Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV
_enIN818IN818&tbm=isch&sa=1&ei=zmrVW9zCE8mBvQS13qWADQ
&q=precast+concrete+site+assembly&oq=precast+concrete+site+as
sembly&gs_l=img.3...721103.725138.0.725466.13.13.0.0.0.0.166.16
13.0j13.13.0....0...1c.1.64.img..0.12.1488...0j0i67k1j35i39k1.0.j96Yj7
cclNs#imgrc=.
• A parking garage structure consisting of precast T
supported by beams on columns
Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV
_enIN818IN818&tbm=isch&sa=1&ei=qG3VW9itCcHNvgSp4pQQ&q=
precast+concrete+garage&oq=precast+concrete+garage&gs_l=img.3
..0j0i30k1j0i8i30k1l2j0i24k1l6.249706.250581.0.250727.6.6.0.0.0.0.
201.633.0j3j1.4.0....0...1c.1.64.img..2.4.632....0.Sy6XhNzF4BM#imgr
c=GQH7HL43PdNg-M:
• A parking garage structure consisting of precast T
supported by beams on columns
Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV
_enIN818IN818&tbm=isch&sa=1&ei=qG3VW9itCcHNvgSp4pQQ&q=
precast+concrete+garage&oq=precast+concrete+garage&gs_l=img.3
..0j0i30k1j0i8i30k1l2j0i24k1l6.249706.250581.0.250727.6.6.0.0.0.0.
201.633.0j3j1.4.0....0...1c.1.64.img..2.4.632....0.Sy6XhNzF4BM#imgr
c=GQH7HL43PdNg-M:
Manufacturing of Pre cast Elements
• Precast elements are manufactured in casting bed,
800 ft or more in length as per design
• High strength steel strands are strung the length of
the bed and then tensioned.
• Conventional eninforcemnts ,welds and others are
embedded
• Concrete is placed
• Pre cast elements may contain prestressed strands or
Conventional reinforcing.
• Once concrete is cured to sufficient length sections
are cut as per design
• Individual sections are lifted from bed and stock
piled
• Elements are shipped to site
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I
N818&tbm=isch&sa=1&ei=ZWjVW6y0B8bfvgSqiJ7ADw&q=precast+conc
rete+stairs&oq=precast+concrete+s&gs_l=img.3.1.0j0i67k1j0l8.554837.
JOINING PRE CAST ELEMNTS
Column to Column Connection
• Metal bearing and embedded anchor bolts are cast into th ends of concret
• Mechanically joined
• Connection is grouted to full bearing between elements and protect the metal components from fire
and corrosion
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I
N818&tbm=isch&sa=1&ei=p27VW73IFcHZvgScnquYCQ&q=precast+con
crete+column+connection+details&oq=precast+concrete+column+&gs_l
=img.1.2.0l7j0i30k1j0i8i30k1l2.1310581.1311773.0.1314805.7.5.0.2.2.0
.154.671.0j5.5.0....0...1c.1.64.img..0.7.674....0.7APjyR8DsZY#imgrc=kl-
Beam to Column Connection
• Beams are set on bearing pads on the column corbel
• Steel angles are welded to metal plates cast into beams and columns and the joint is grouted
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I
N818&tbm=isch&sa=1&ei=p27VW73IFcHZvgScnquYCQ&q=precast+con
crete+beam+connection+details&oq=precast+concrete+column+&gs_l=i
mg.1.2.0l7j0i30k1j0i8i30k1l2.1310581.1311773.0.1314805.7.5.0.2.2.0.1
54.671.0j5.5.0....0...1c.1.64.img..0.7.674....0.7APjyR8DsZY#imgrc=kl-
Site cast Concrete toppings over Pre cast Slab
• To achieve greater strength and
stiffness
• More fire and acoustical resistance
• Allow easy integration of electrical
services into floor system
• Create a smoother finish
Source: Source : Source
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tb
m=isch&sa=1&ei=p27VW73IFcHZvgScnquYCQ&
LIGHT WEIGHT
CONCRETE
CONSTRUCTION
Light Weight concrete
• Light weight concrete mixture made with light weight coarse
aggregates and some time a portion or entire fine aggregates
instead od normal aggregates
• LWC Desnsity: 1440-1840 Kg/metre cube
• NWC Density: 2240-2400 Kg/metre cube
Source:
https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I
N818&tbm=isch&sa=1&ei=vYPVW9DXEcHTvgSHhZmoDA&q=light+weig
ht+concret&oq=light+weight+concret&gs_l=img.3..0i10k1l2j0j0i10k1j0l
2j0i30k1j0i5i30k1j0i5i10i30k1j0i5i30k1.2010288.2014972.0.2015326.20
.16.0.4.4.0.216.2324.0j8j4.12.0....0...1c.1.64.img..4.16.2346...35i39k1j0i
67k1j0i10i30k1.0.hZGMlIUquIQ#imgrc=yeti4l65rNJYYM:.
Classification
• Light weight Aggregate Concrete
• Aerated/Cellular/Foamed Concrete
• No Fines Concrete
Light Weight Aggregate Concrete
• Use of light weight aggregates
• Types –
• Pumice- used in RCC slab mainly in
industrial roofs
• Foamed slag- first light weigh aggregate
used for reinforced concrete
• Expanded Clay and Shales- capable of
achieving high strenhght for pre
stressed concret
• Sintered Pulverised-fuel ash aggregate-
Variety of structural use
Aerated Concrete
• It has lowest density, thermal conductivity and strength
• Like timer can be sawn. Screwed and nailed but are non
combustible
• Usual method of aeration-mixing stabilized foam or by
whipping aim in with the aid of an air entraining agent
• Aluminous powder added which reacts with alkaline
substances forming hydrogen bubbles
• They are high pressure steam cured
No Fines Concrete
• Made only of cement and
coarse aggregates (9-19mm)
• Mainly used for load bearing,
cast in situ external and
internal wall and non load
bearing walls
• Its strength is considerably
lower than that of normal
concrete
•
OTHER CLASSIFICATION BASED ON
DENSITY AND STRENGTH
• Low Density Concrete
• Insulation purposes,low weight
• 800kg/metre cube
• .69-6.89N/metre square compressive strength
• Moderate Density Concrete
• Used for fill concrete
• 6.89-17.24 N/ metre square compressive strength
• Density between structural and low density concrete
• Structural Concrete
• Min of 17.24 N/metre squrare of strength
• Greater weight
• Insulation lower
• 1500 kg/metre cube of density-around
USES
• Screeds and thickening purposes
• Heat insulation in roof
• Insulating water pipes
• Casting steel to protect against fire
• Construction of partition walls
• Surface rendered for external walls
ADVANTAGES
• Increased strength
• Improved durability
• Reduced dead load
• Faster rate of construction
• Availability of aggregates
REFERENCES
• Lin, T.Y.; Burns, Ned H. (1981). Design of Prestressed Concrete Structures (Third ed.). New York, US: John Wiley &
Sons
• Raju, Krishna. Pre cast Concrete (PDF) (Fourth ed.). New Delhi: Tata McGraw Hill. . Retrieved 7 October 2018.
• CM Engineering Consultants. "Ocean Heights 2, Dubai UAE". http://www.cmecs.co. CMECS. Retrieved 9
October 2018
• "reinforced concrete | building material". Encyclopædia Britannica. Retrieved on 24 October 2018
• NPCA - Precast Products - Stormwater Management FAQArchived 20 August 2008 at the Wayback Machine
Retrieved on 24 October 2018
• Mishra, G. (2018, September 9). What is Lightweight Concrete? -Types, Uses and Advantages. Retrieved from
https://theconstructor.org/concrete/lightweight-concrete
Thank
You

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Advance Precast Concrete Construction

  • 1. Advance Building Construction CONCRETE CONSTRUCTIONS: Pre stressed ,Pre cast & Light Weight Yash Kotgirwar|114AR0032
  • 3. Pre Stressed Concrete • A form of concrete that is ‘prestressed’ by being placed under compression prior to supporting any loads. • Compression is produced by tensioning of high strength ‘tendons’ located within the concrete to improve the performance • Tendons may be single wire, multi wire strands or threaded bars • Once the initial compression has been applied , the material has high strength when subjected to compressive force and any tensile loading • Improves structural capacity and serviceability as compared to conventional concrete Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=znPVW9f2IoSCvQT- hKsg&q=prestressed+concrete&oq=pre+stressed+co&gs_l=img.3.0.0i10k1l10.3005861.3010984.0.3012242.15.15.0.0.0.0.249.1942.0j8j2.10.0....0...1c.1.64.img..5.10.19
  • 4. TYPES OF PRE STRESSING PRE TENSIONING POST TENSIONING
  • 8. Applications in Buildings • Longer spans for same structural depth • Reduced Structural thickness • Faster Stripping Time • Reduced material cost • Load balancing • Varied Load bearing
  • 9. Applications in Buildings Capital Gate ,Abu Dhabi ICC Tower, Hong kong Ocean Heights,London Source: Wikepedia/Pre stressed concrete
  • 10. Other Uses Source: Wikepedia/Pre stressed concrete • Dams • Bridges • Silos and tanks • Handstands and pavements • Nuclear blast containment structures Incheon Bridge,South Korea Wanapuran Dam,Washington
  • 12. Plant Cast Cement Concrete • Concrete elements ,casted and cured at plant and then transported to the site. • Plant casting increases efficiency and quality control • Durable and permanent steel forms used many times • Reduce in formwork cost • High early strength cement and steam curing allow concrete members to be casted and cured in 24 hours Source: https://www.google.co.in/search?q=pre+cast+concrete+factory&safe=active&rlz=1C1GGRV_enIN818IN818&source=lnms&tbm=isch&sa=X&ved=0ahUKEwis44PryqjeAh UIuo8KHQs-DwUQ_AUIDygC#imgrc=yd6DLDSgh7_47M:
  • 13. Plant Cast Cement Concrete • Casting conditions, quality and surface finishes can be controlled • Mostly either made by normal casting or pre-tensioning casting which may increase structural efficiency • Conventional steel added to increase durability and resist stresses Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&q=precast+concrete+pretensioned&spell=1&sa=X&ved=0ahUKEwj2nrK0zKjeAh XEvo8KHU49AWAQBQg9KAA#imgrc=6qY4OBAaRg6FiM:
  • 14. Plant Cast Cement Concrete • On site, precast concrete elements are lifted into place and assembled • Compared to site cast, pre cast erection is faster and less affected by adverse weather condition Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=D2PVW- KTDJ6OvQSauY6IBQ&q=precast+concrete+site+assembling&oq=precast+concrete+site+assembling&gs_l=img.3...52631.56927.0.57257.19.18.0.0.0.0.249.2355.0j9j3.12. 0....0...1c.1.64.img..7.2.388...0.0.pjjOXePoLCo#imgrc=AzVQc1kgfH13GM:
  • 15. PRE CAST , PRE STRESSED CONCRETE STRUCTURAL ELEMENTS
  • 16. Pre cast Concrete Slabs • Used for floor and roof decks • Available in different types as per loads design Source: https://www.google.co.in/search?safe=active &rlz=1C1GGRV_enIN818IN818&tbm=isch&sa =1&ei=TWPVW9W0MYmWvQSRmJDIBg&q= precast+concrete+slabs&oq=precast+concret Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=TWPVW9W0MYmWvQSRmJDIBg&q=precast+concrete+slabs&oq=precas t+concrete+slabs&gs_l=img.3..0l9j0i30k1.549450.550480.0.550699.5.4.0.1.1.0.216.587.0j2j1
  • 17. Pre cast Concrete Beams and Girders • Provide support for slabs • Projecting reinforcing bars bond with concrete cast on site • Picture showing inverted T beam supported by pre cast coulmns Source:https://www.google.co.in/search?saf e=active&rlz=1C1GGRV_enIN818IN818&tbm =isch&sa=1&ei=eWXVW_GACcfovASPkaSoD w&q=precast+concrete+beams+and+girders &oq=precast+concrete+beams+and+girders& gs_l=img.3...448343.452537.0.452795.22.21. 0.0.0.0.378.2964.0j8j5j1.14.0....0...1c.1.64.im g..8.8.1835...0j35i39k1j0i67k1j0i Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm=isch&sa=1&ei=TWPVW9W0MYmWvQSRmJDIBg&q=precast+concrete+slabs&oq=precas t+concrete+slabs&gs_l=img.3..0l9j0i30k1.549450.550480.0.550699.5.4.0.1.1.0.216.587.0j2j1
  • 18. Pre cast Concrete Columns and Wall Panels • Provide support for beam and slab elements • Mostly subjected to axial loading so can be reinforced without prestressing • Long slender elements can be pre casted to provide resistance to bending forces during handling and erection • Wall panels can be solid or sandwiched with an insulating layer • These panels can be ribbed to increase verticality while minimizing weight Source: https://www.google.co.in/search?safe=active &rlz=1C1GGRV_enIN818IN818&tbm=isch&sa =1&ei=Q2fVW9qVDMjWvASGiKL4BA&q=prec ast+concrete+walls+and+columns&oq=preca st+concrete+walls+and+columns&gs_l=img.3. ..277861.285320.0.285490.18.17.1.0.0.0.230 .1768.0j6j3.9.0....0...1c.1.64.img..8.3.669...0j 0i24k1.0.0BrZrzDwgyg#imgrc=71uUrmgu92bl vM:
  • 19. Pre cast Concrete Elements • Pre cast concrete stair • Uniquely shaped structural elements for a sports stadium Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I N818&tbm=isch&sa=1&ei=ZWjVW6y0B8bfvgSqiJ7ADw&q=precast+conc rete+stairs&oq=precast+concrete+s&gs_l=img.3.1.0j0i67k1j0l8.554837. Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tbm =isch&sa=1&ei=mGrVW9qSBoncvgTE25joDw&q=precast+concrete+elemnts+for+stadium &oq=precast+concrete+elemnts+for+stadium&gs_l=img.3...42845.49166.0.49475.21.21.0. 0.0.0.715.2855..
  • 20. Assembly Concepts • Vertical supports can be provided by combination of pre cast beams, columns and wall panels • Choice of roof and slabs depend upon load and span • Pre cast slab elements are frequently also used with other vertical load bearing system such as site cast concrete, reinforced masonry or steel. Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV _enIN818IN818&tbm=isch&sa=1&ei=zmrVW9zCE8mBvQS13qWADQ &q=precast+concrete+site+assembly&oq=precast+concrete+site+as sembly&gs_l=img.3...721103.725138.0.725466.13.13.0.0.0.0.166.16 13.0j13.13.0....0...1c.1.64.img..0.12.1488...0j0i67k1j35i39k1.0.j96Yj7 cclNs#imgrc=.
  • 21. • A parking garage structure consisting of precast T supported by beams on columns Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV _enIN818IN818&tbm=isch&sa=1&ei=qG3VW9itCcHNvgSp4pQQ&q= precast+concrete+garage&oq=precast+concrete+garage&gs_l=img.3 ..0j0i30k1j0i8i30k1l2j0i24k1l6.249706.250581.0.250727.6.6.0.0.0.0. 201.633.0j3j1.4.0....0...1c.1.64.img..2.4.632....0.Sy6XhNzF4BM#imgr c=GQH7HL43PdNg-M:
  • 22. • A parking garage structure consisting of precast T supported by beams on columns Source:https://www.google.co.in/search?safe=active&rlz=1C1GGRV _enIN818IN818&tbm=isch&sa=1&ei=qG3VW9itCcHNvgSp4pQQ&q= precast+concrete+garage&oq=precast+concrete+garage&gs_l=img.3 ..0j0i30k1j0i8i30k1l2j0i24k1l6.249706.250581.0.250727.6.6.0.0.0.0. 201.633.0j3j1.4.0....0...1c.1.64.img..2.4.632....0.Sy6XhNzF4BM#imgr c=GQH7HL43PdNg-M:
  • 23. Manufacturing of Pre cast Elements • Precast elements are manufactured in casting bed, 800 ft or more in length as per design • High strength steel strands are strung the length of the bed and then tensioned. • Conventional eninforcemnts ,welds and others are embedded • Concrete is placed • Pre cast elements may contain prestressed strands or Conventional reinforcing. • Once concrete is cured to sufficient length sections are cut as per design • Individual sections are lifted from bed and stock piled • Elements are shipped to site Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I N818&tbm=isch&sa=1&ei=ZWjVW6y0B8bfvgSqiJ7ADw&q=precast+conc rete+stairs&oq=precast+concrete+s&gs_l=img.3.1.0j0i67k1j0l8.554837.
  • 24. JOINING PRE CAST ELEMNTS
  • 25. Column to Column Connection • Metal bearing and embedded anchor bolts are cast into th ends of concret • Mechanically joined • Connection is grouted to full bearing between elements and protect the metal components from fire and corrosion Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I N818&tbm=isch&sa=1&ei=p27VW73IFcHZvgScnquYCQ&q=precast+con crete+column+connection+details&oq=precast+concrete+column+&gs_l =img.1.2.0l7j0i30k1j0i8i30k1l2.1310581.1311773.0.1314805.7.5.0.2.2.0 .154.671.0j5.5.0....0...1c.1.64.img..0.7.674....0.7APjyR8DsZY#imgrc=kl-
  • 26. Beam to Column Connection • Beams are set on bearing pads on the column corbel • Steel angles are welded to metal plates cast into beams and columns and the joint is grouted Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I N818&tbm=isch&sa=1&ei=p27VW73IFcHZvgScnquYCQ&q=precast+con crete+beam+connection+details&oq=precast+concrete+column+&gs_l=i mg.1.2.0l7j0i30k1j0i8i30k1l2.1310581.1311773.0.1314805.7.5.0.2.2.0.1 54.671.0j5.5.0....0...1c.1.64.img..0.7.674....0.7APjyR8DsZY#imgrc=kl-
  • 27. Site cast Concrete toppings over Pre cast Slab • To achieve greater strength and stiffness • More fire and acoustical resistance • Allow easy integration of electrical services into floor system • Create a smoother finish Source: Source : Source https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818IN818&tb m=isch&sa=1&ei=p27VW73IFcHZvgScnquYCQ&
  • 29. Light Weight concrete • Light weight concrete mixture made with light weight coarse aggregates and some time a portion or entire fine aggregates instead od normal aggregates • LWC Desnsity: 1440-1840 Kg/metre cube • NWC Density: 2240-2400 Kg/metre cube Source: https://www.google.co.in/search?safe=active&rlz=1C1GGRV_enIN818I N818&tbm=isch&sa=1&ei=vYPVW9DXEcHTvgSHhZmoDA&q=light+weig ht+concret&oq=light+weight+concret&gs_l=img.3..0i10k1l2j0j0i10k1j0l 2j0i30k1j0i5i30k1j0i5i10i30k1j0i5i30k1.2010288.2014972.0.2015326.20 .16.0.4.4.0.216.2324.0j8j4.12.0....0...1c.1.64.img..4.16.2346...35i39k1j0i 67k1j0i10i30k1.0.hZGMlIUquIQ#imgrc=yeti4l65rNJYYM:.
  • 30. Classification • Light weight Aggregate Concrete • Aerated/Cellular/Foamed Concrete • No Fines Concrete
  • 31. Light Weight Aggregate Concrete • Use of light weight aggregates • Types – • Pumice- used in RCC slab mainly in industrial roofs • Foamed slag- first light weigh aggregate used for reinforced concrete • Expanded Clay and Shales- capable of achieving high strenhght for pre stressed concret • Sintered Pulverised-fuel ash aggregate- Variety of structural use
  • 32. Aerated Concrete • It has lowest density, thermal conductivity and strength • Like timer can be sawn. Screwed and nailed but are non combustible • Usual method of aeration-mixing stabilized foam or by whipping aim in with the aid of an air entraining agent • Aluminous powder added which reacts with alkaline substances forming hydrogen bubbles • They are high pressure steam cured
  • 33. No Fines Concrete • Made only of cement and coarse aggregates (9-19mm) • Mainly used for load bearing, cast in situ external and internal wall and non load bearing walls • Its strength is considerably lower than that of normal concrete •
  • 34. OTHER CLASSIFICATION BASED ON DENSITY AND STRENGTH • Low Density Concrete • Insulation purposes,low weight • 800kg/metre cube • .69-6.89N/metre square compressive strength • Moderate Density Concrete • Used for fill concrete • 6.89-17.24 N/ metre square compressive strength • Density between structural and low density concrete • Structural Concrete • Min of 17.24 N/metre squrare of strength • Greater weight • Insulation lower • 1500 kg/metre cube of density-around
  • 35. USES • Screeds and thickening purposes • Heat insulation in roof • Insulating water pipes • Casting steel to protect against fire • Construction of partition walls • Surface rendered for external walls
  • 36. ADVANTAGES • Increased strength • Improved durability • Reduced dead load • Faster rate of construction • Availability of aggregates
  • 37. REFERENCES • Lin, T.Y.; Burns, Ned H. (1981). Design of Prestressed Concrete Structures (Third ed.). New York, US: John Wiley & Sons • Raju, Krishna. Pre cast Concrete (PDF) (Fourth ed.). New Delhi: Tata McGraw Hill. . Retrieved 7 October 2018. • CM Engineering Consultants. "Ocean Heights 2, Dubai UAE". http://www.cmecs.co. CMECS. Retrieved 9 October 2018 • "reinforced concrete | building material". Encyclopædia Britannica. Retrieved on 24 October 2018 • NPCA - Precast Products - Stormwater Management FAQArchived 20 August 2008 at the Wayback Machine Retrieved on 24 October 2018 • Mishra, G. (2018, September 9). What is Lightweight Concrete? -Types, Uses and Advantages. Retrieved from https://theconstructor.org/concrete/lightweight-concrete