This document provides an overview of precast prestressed hollowcore slabs. It discusses the benefits of hollowcore slabs such as longer clear spans, faster construction time, and improved structural performance from reduced weight. Hollowcore slabs come in various depths from 8 to 14 inches to match loading and span requirements. Examples are given of projects in British Columbia that used hollowcore slabs, including many Real Canadian Superstore locations, the Richmond Speed Skating Oval, and the Uptown Mall in Victoria. The document concludes with a discussion of different structural systems that can be used with hollowcore slabs, such as cast-in-place slabs, steel frames, and precast frames.

1. Precast Prestressed Hollowcore Slabs
February 26, 2014
Scott L Marshall P. Eng.
&
Ebi Moradi P. Eng.

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4. Introduction
Scott L
Scott Marshall P. Eng.
Senior Business Development Engineer
Engineered Precast Solutions
Armtec
Scott has worked the last 35 years with Armtec in Engineered Precast
Concrete Solutions in marketing and sales, providing technical and
budgeting advice to Engineers and Contractors in regards to precast
prestressed concrete bridge girders, marine structures and industrial
structures.
Scott was involved in the development of the hybrid system of using
precast concrete Hollowcore slabs and cast in place slab bands and
columns on most of the Real Canadian Superstores in BC and most
recently the Uptown Mall in Victoria.
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5. Introduction
Ebi Moradi P. Eng.
Senior Sales Engineer & Project Manager
Engineered Precast Solutions
Armtec
Ebi has over 20 years experience in precast concrete in sales, marketing
and operations, providing technical and budgeting advice to clients in
regards to various application of precast and pre-stressed concrete
components such as parking structures, architectural claddings, insulated
wall panels, and Hollowcore.
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6. Introduction
Armtec is a leading global infrastructure and
construction materials company
•
48 locations in Canada, including production facilities and
offices in every region
• Global customer base with projects around the world
• Approximately 2,000 employees, $500M
• Toronto Stock Exchange trading symbol: ARF.UN
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7. Introduction…legacy Con-Force
•
Precast prestressed Double Tees
•
Precast columns, beams and spandrel panels.
•
Precast prestressed Bridge Girders
•
Precast prestressed stay in place deck panels.
•
Precast prestressed Hollowcore slabs.
•
Precast prestressed piles.
•
Architectural panels.
•
Insulated wall panels
•
RECO MSE walls.
•
EPS wall panels.
•
Stadium bleacher seats.
•
Concrete Sound Fencing….NEW!
•
Durisol Noise Barriers…NEW!
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8. Armtec Richmond BC plant
Armtec bought Con-Force
Structures Limited in
October 2007
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9. Current Project – Evergreen Line
$17 Million Supply Contract, 1000 Segments
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10. Current Project – Evergreen Line
Yarding of Match Cast Segments
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11. Port Mann Water Supply Tunnel Liners
1,000 Rings, 6,000 Segments
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12. Port Mann Water Supply Tunnel Liners
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13. What is Prestressing?
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14. What is Prestressing?
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15. Plant Prestressing Beds
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16. What is Hollowcore (HC) ?
Precast Prestressed Hollowcore slabs
•
Primary use is floor and roof slabs
• Continuous voids are used to reduce weight and improve
structural performance
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17. Available Hollowcore (HC) depths
•
8 inch (203mm) slabs span 30 feet (9m) for 100 PSF (4.8KN/m2)
•
12 inch (305mm) slabs span 40 feet (12m) for 100 PSF (4.8KN/m2)
•
14 inch (356mm) slabs span 45 feet (13.7m) for 100 PSF (4.8KN/m2)
•
10 inch (254mm)…subject to machine availability.
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18. Benefits of Hollowcore
1. Longer clear spans…versatility of
space.
2. Fast track construction…$’s to owners
3. Design for control of deflection.
4. Design to limit tensile stress in bottom
flange…corrosive environments
5. Immediate working platform on site.
6. Manages field skilled trade shortages.
7. Not impacted by high floor to floor heights.
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19. Structural Systems with Hollowcore
1. Hollowcore on cast in place slab
bands and columns.
2. Hollowcore on steel columns and
beams.
3. Hollowcore on precast columns
and beams.
4. Hollowcore on masonry walls.
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20. Hollowcore casting beds
4 casting beds of 300 feet long
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21. Hollowcore casting beds
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22. Hollowcore casting machine
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23. Hollowcore saw
Can saw cut longitudinally and skew cuts
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24. HC on cast in place formwork
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25. Real Canadian Superstore - Kamloops - 1999
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26. Real Canadian Superstore - Kamloops - 1999
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27. Real Canadian Superstore - Kamloops - 1999
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28. Real Canadian Superstore - Kamloops - 1999
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29. Real Canadian Superstore - Kamloops - 1999
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30. Real Canadian Superstore - Kamloops - 1999
36 foot by 30 foot gridlines for columns
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31. Cast in place beams around perimeter
Cast in place cord reinforcing at perimeters
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32. Real Canadian Superstore –Richmond - 2000
Installation inside existing building
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33. Real Canadian Superstore Projects
1. South West Marine Drive – 1988
2. Kamloops – 1999
3. Richmond – 2000
4. Coquitlam – 2001
5. North Surrey - 2001
6. Abbotsford – 2003
7. North Delta – 2003
8. Mission - 2005
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34. Electronic Arts – Burnaby - 2004
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35. Electronic Arts – Burnaby - 2004
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36. Electronic Arts – Burnaby 2004
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37. 4800 Kingsway - 2005
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38. Richmond Speed Skating Oval - 2006
First use of 14 inch Hollowcore
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39. Richmond Speed Skating Oval - 2006
First use of 14 inch Hollowcore
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40. HC on first stage slab band
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41. Edmonds Centre – Burnaby - 1992
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42. Edmonds Centre – Burnaby - 1992
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43. Wal-Mart South Surrey – 2007
45 foot by 45 foot grid
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44. Uptown Mall in Victoria - 2008
Wal-Mart - 45 foot by 45 foot grid lines
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45. Uptown Mall in Victoria - 2008
Wal-Mart 45 foot by 45 foot grid lines
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46. Uptown Mall in Victoria - 2008
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47. Uptown Mall in Victoria - 2008
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48. Anvil Project New Westminster - 2007
Hollowcore and precast frames
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49. Anvil Project New Westminster - 2007
Precast frames
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50. Anvil Project New Westminster - 2007
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51. Anvil Project New Westminster - 2007
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52. Colebrook Business Centre - 2007
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53. Colebrook Business Centre - 2007
Hollowcore on precast beams and columns
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54. The Liu Centre - 2000
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55. The Liu Centre - 2000
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56. The Liu Centre - 2000
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57. HC on steel – Surrey City Centre - 2001
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58. HC on steel – Surrey City Centre - 2001
10 foot cantilever on 12 inch Hollowcore
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59. HC on steel – Villa Parkade - 2008
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60. HC on steel – Villa Parkade - 2008
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61. Hollowcore and Termobuild
www.termobuild.com
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62. “D” Girder System…Marriot Hotel…Edmonton
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63. D”” Girder System…Marriot Hotel…Edmonton
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64. Summary
• Hollowcore
•
Primary use is floor and roof slabs
• Reduce weight and improve structural performance
• Cast in 1220 mm widths
• Various thickness to match to loading and span
• Benefits
•
Longer clear spans - space versatility
• Increase speed of construction - early occupancy
• Design for control of flexural cracking
• Less demand for field labour
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65. Hollowcore
QUESTIONS?
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Today’s Host:
Ebi Moradi
ebi.moradi@armtec.com
604-214-3253
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