ct-18 special construction methods
TRANSCRIPT
![Page 1: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/1.jpg)
Concrete Technology
Harza Engineering Company
Special Construction Methods
![Page 2: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/2.jpg)
Special construction methods and materials Tunnel lining Horizontal slipform paving Canal lining Vertical slipform construction Roller-compacted concrete Controlled Low Strength Material
(CLSM) Pervious concrete
![Page 3: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/3.jpg)
Concrete tunnel lining
Types Circular tunnels Horseshoe Shaped
Lining types Full-circle (Smaller diameters) Multiple placements (Large diameter)
Invert Sidewalls Crown
![Page 4: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/4.jpg)
Placement methods
Invert and sidewalls Conveyors Pumping Invert slipform
Arch or crown section Pumping
![Page 5: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/5.jpg)
Types of placement
Bulkhead sections dependent on length of form
Continuous placement Telescoping forms
![Page 6: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/6.jpg)
Important items Rock cleanup and control of water Cleaning of construction joints Equipment capable of placing the
required concrete mixture Segregation during handling and
placement Proper consolidation (limited access)
- form and immersion vibrators Filling upper most reaches of the
crown
![Page 7: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/7.jpg)
![Page 8: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/8.jpg)
![Page 9: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/9.jpg)
![Page 10: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/10.jpg)
![Page 11: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/11.jpg)
![Page 12: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/12.jpg)
![Page 13: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/13.jpg)
![Page 14: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/14.jpg)
![Page 15: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/15.jpg)
![Page 16: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/16.jpg)
![Page 17: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/17.jpg)
Horizontal slipform paving
Paving machines Slabs Curbs Barriers
All horizontal paving requires low slump concrete and good vibration
Consistent concrete is essential
![Page 18: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/18.jpg)
![Page 19: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/19.jpg)
![Page 20: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/20.jpg)
![Page 21: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/21.jpg)
![Page 22: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/22.jpg)
![Page 23: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/23.jpg)
![Page 24: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/24.jpg)
![Page 25: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/25.jpg)
![Page 26: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/26.jpg)
![Page 27: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/27.jpg)
Slope paving
Canal lining machine Slipform screed
Alternating panels
![Page 28: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/28.jpg)
![Page 29: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/29.jpg)
![Page 30: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/30.jpg)
![Page 31: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/31.jpg)
![Page 32: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/32.jpg)
![Page 33: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/33.jpg)
![Page 34: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/34.jpg)
Vertical slipform construction
Jacking system on vertical rods Suitable for silos and shafts
![Page 35: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/35.jpg)
![Page 36: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/36.jpg)
Pervious concrete
![Page 37: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/37.jpg)
![Page 38: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/38.jpg)
![Page 39: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/39.jpg)
![Page 40: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/40.jpg)
![Page 41: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/41.jpg)
![Page 42: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/42.jpg)
Controlled Low Strength Material (CLSM)
CLSM is a self-compacted, cementitious material used primarily as a backfill in lieu of compacted fill. (ACI 229R)
Most current CLSM applications require unconfined compressive strengths of 300 psi or less. This strength requirement is necessary to allow for future excavation of CLSM.
![Page 43: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/43.jpg)
Applications
Backfill Structural fills Insulating fills Pavement bases Conduit bedding Erosion control Void filling
![Page 44: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/44.jpg)
Materials Cement Fly ash
Class C Class F
Fine aggregate ASTM C 33 Silty sand (up to 20% minus #200)
Coarse aggregate (occasionally) Air-entraining admixture
![Page 45: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/45.jpg)
Mixture proportions
Slump range - 6 to 8 inches Cement content - 50 to 200 pcy Fly ash content - none to 2000 pcy Water contents - typically 325 to
580 pcy Air content as high as 20% Balance of mixture is aggregate
![Page 46: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/46.jpg)
![Page 47: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/47.jpg)
![Page 48: CT-18 Special Construction Methods](https://reader033.vdocument.in/reader033/viewer/2022052522/5466b299b4af9f01758b4a51/html5/thumbnails/48.jpg)