site cast concrete
TRANSCRIPT
![Page 1: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/1.jpg)
1
Materials & Methods of ConstructionDepartment of Architecture
University of IdahoDiane Armpriest, Assistant Professor
Site Cast Concrete
“Concrete that is cast into forms on theconstruction site”
Allen & Iano
Site cast concrete process
Concrete mix & placementFormworkReinforcementShoring & re-shoringJointsFinish
Concrete formwork
Concrete formwork Lumber & plywood Sheet steel & angles Glass fiber reinforced plastic
Forms must be treated with release agentbefore placing concrete and stripped whenconcrete has cured
Formwork design is responsibility of contractor
![Page 2: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/2.jpg)
2
Dimensional lumber used for ground-supported slab
Principles of reinforcing concrete
Proper reinforcement requires an adequateamount of steel placed in the correct location Locate reinforcing bars where element is placed in
tension. Locate stirrups near the ends of beams to resist
shear forces.
Adequate concrete cover to protect rebarfrom corrosion
Columnreinforcing
![Page 3: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/3.jpg)
3
Beam Reinforcing
Elements of a site-cast concrete structure
Slab on gradeWallColumnFloor systems
Slab-on-gradediagram
![Page 4: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/4.jpg)
4
JointsControl Joints
ConstructionJoint
IsolationJoint
control
control
![Page 5: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/5.jpg)
5
Control Joints
Setting rebar and metal control joints in slab
![Page 6: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/6.jpg)
6
Field Verification of reinforcement by Engineer
Underslab conditions prior to pour.
Isolation Joint
![Page 7: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/7.jpg)
7
Construction joint
Hand leveling concrete driveway apron
![Page 8: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/8.jpg)
8
Floating the slab
Machine floating large slab
![Page 9: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/9.jpg)
9
![Page 10: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/10.jpg)
10
Finishing & edging
![Page 11: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/11.jpg)
11
Sawcut joints
Wall formwork:plywood anddimension lumberfastened withremovable clampsand form ties.
Wall form
![Page 12: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/12.jpg)
12
Exterior of formwork
Site cast concrete wall, Salk InstituteWall,Salk Institute, Louis I.Kahn
Construction joint in wall
![Page 13: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/13.jpg)
13
Column Reinforcing Diagram
Steel and fiber formwork for round columns
![Page 14: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/14.jpg)
14
Assembling Rebar Cages
Assembling column formwork
CompletedColumn
![Page 15: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/15.jpg)
15
Self-climbing
Self-climbing formwork
Concrete FloorSystems
Beam supported
Beamless
![Page 16: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/16.jpg)
16
Shoring & reshoring
Adjustable temporary shoring is used tosupport formwork concrete for elevatedconcrete structures.
Re-shoring is used to support two curingfloors after formwork is stripped.
Formwork and shores for elevated concrete slab
Flat plate slab
![Page 17: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/17.jpg)
17
Flat plate slab w/ columncaps
flyingformwork
Post-tensioning
![Page 18: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/18.jpg)
18
Cable-ends
Tightening cables
Floor formwork, reshoring, post-tensioned slab
![Page 19: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/19.jpg)
19
Frame w/cables plugged
Beam supported slab
Joist slab diagram
![Page 20: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/20.jpg)
20
Joist slab action
On-way joist slab formwork
Joist slab from below
![Page 21: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/21.jpg)
21
Waffle slab diagram
Waffle slab formwork
Rib formed, bush-hammered
![Page 22: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/22.jpg)
22
Board formed
Regulatory Issues
Fire ResistanceCover of reinforcementSlab thickness
Seismic/lateral loadsJoint strength
Advantages of site cast concrete
Sculptural possibilities (“can do almost anything”)
formsurface texture
Economical and structurally efficient when astandardized framing system is used
More energy efficient to produce than steel
Long-lasting
Concrete is generally produced and available locally
![Page 23: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/23.jpg)
23
Disadvantages
Long on-site erection timeprone to weather related delays
Non-standardized construction can be very expensive.
TWA Terminal, NewYork, Eero Saarinen
TWA, Interior Stairs
![Page 24: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/24.jpg)
24
Site-cast reinforced concrete frame
Columns vary with load and strength of concrete.
Minimum dimension, 10 in. in either direction
Girders, beams & slabs
Depth of girders, beams and slabs vary based on:
frame design strategy
method of reinforcement
Use Appendix B as a guide
![Page 25: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/25.jpg)
25
Chart fromAppendix B
Girders, beams & slabs
Estimate depth of slab if Span A = 40 ft.
A
![Page 26: Site cast Concrete](https://reader033.vdocument.in/reader033/viewer/2022061117/5467256db4af9f583f8b56ad/html5/thumbnails/26.jpg)
26
Estimate depth of slab if Span A = 40 ft.
Assume post-tensioned slab. (Why?)
Slab thickness = Span = .8 ft, or 10-1/2 in.45