Hollowcore – Pre-stressed Concrete Slabs

Host: Scott Marshall P.Eng.

2

Join the Discussion!

3

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

4

Introduction

• BEBO Concrete Arches

• Bin-Wall

• Bin-Wall Bridge Abutments

• Bridge Girders and Beams

• Bridge-Plate

• Communications

• Concrete Sound Fencing

• Corrugated Steel Pipe

• Double Tees

• Durisol Precast Noise Barriers

• Electrical

• Geosynthetics

• HDPE Pipe

• HDPE Tubing

• Mechanically Stabilized Earth Retaining Walls

• Multi-Plate

• Paraglas Soundstop

• Platon

• Precast Concrete Steps

• Precast Concrete Structures and Elements

• Precast Tunnel Liner

• Precast Utility Pads

• Prestressed Hollowcore Slabs

• Sports Venues

• Stormwater Treatment/Detention Systems

• Streetlight Bases and Traffic Control

• Sumps and Trenches

• Tunnel Liner Plate

• Ultra Flo Steel Pipe

• Water Control Products

5

Professional Development Hours (PDH)

• Qualifies as 1 hour Informal (20 Professional Development Hours maximum per year)

• If you have provided an e-mail and are logged on throughout the presentation, a formal completion certificate will be sent to you within one week

• Enter CPD activities in the APEGBC On-line Reporting Centre: http://www.apeg.bc.ca/prodev/online.html

• A full copy of the Continuing Professional Development (CPD) Guideline can be viewed at: http://www.apeg.bc.ca/prodev/documents/cpdguideline.pdf

6

Introduction

Scott L Marshall P. Eng.Bridge and Marine Structures Specialist

Senior Business Development Engineer

Engineered Solutions Division of Armtec

• Scott has worked the last 32 years with Armtec in Engineered Solutions promoting and selling precast prestressed concrete bridge girders, marine structures and industrial structures.

• He was involved in the development of the hybrid system of using precast concrete Hollowcore slabs and cast in place slab bands on many Real Canadian Superstores in BC.

7

What is Hollowcore

• Pre-stressed, precast concrete

• Primary use is floor and roof slabs• Continuous voids are used to reduce weight and improve

structural performance• Cast in 1220 mm widths• Thickness (Richmond BC)

o 203 mmo 305 mmo 356 mm

8

What is Hollowcore

9

What is prestressing?

10

Casting machine and beds

11

Casting beds and saw

12

Method of Construction – HC on forming

13

Real Canadian Superstore - Kamloops

14

Real Canadian Superstore - Kamloops

15

Real Canadian Superstore - Kamloops

16

Method of Construction – HC on slab band

17

Edmonds Centre – Burnaby

18

Edmonds Centre – Burnaby

19

Creative Structures – Surrey City Centre

20

Creative Structures – The Liu Centre

21

Uptown Mall in Victoria

22

Uptown Mall in Victoria

Wal-Mart Store

23

Uptown Mall in Victoria

24

Environment

Environment Friendly Hollowcore with Fly ash

25

Other products use Hollowcore

26

Summary

• Pre-stressed, precast concrete

• 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 deflection• Design for control of flexural cracking• Environmental applications

27

John Rutherford M.Sc. P.Eng.John.Rutherford@armtec.com

(604) 214-3253