SUSTENTABILIDADE Longevidade e estética paraobras em estruturas metálicas                  Murray Cook                Exec...
“The long-term durability provided by galvanizing isachieved at relatively low environmental burden interms of energy and ...
EU Construction               Products Regulation (2011)7. Sustainable use of natural resources    The construction works ...
EU Construction               Products Regulation (2011)7. Sustainable use of natural resources    The construction works ...
Durability• For hot dip galvanizing – long-term durability  is a proven fact.• Accelerated testing and estimations are  un...
The Importance of Case History Data for          Galvanized Structures• Zinc corrosion performance is predictable• Extensi...
Galvanizing Case History    Stainsby Hall Bridge         Cleveland      United Kingdom                           EGGA
Location of the Bridge        Semi-industrial environment,        near the English industrial town        of Middlesbrough
• Stainsby Hall Farm Access Bridge• Cleveland A19/A174 interchange• Erected in 1974
Construction Details• 25 tonnes of structural steel beams• Longest beam = 20 metres• Original coating thickness = >150 μm*...
Detailed Inspection : 1998•   Visual Examination•   Coating Thickness Readings•   Adhesion Testing•   Analysis of Corrosio...
Web and underside of top flange• Spangled appearance evident• Dirt contamination but no zinc salts
End of beam in contact with concrete• No signs of rusting near contact points
Lower face of bottom flange (over road)• Build-up of zinc salts• Average zinc coating of 101 μm
Stainsby Hall Bridge• Predicted corrosion rate when built: 4 μm /year• Actual average corrosion rate: 2-3 μm/year• Corrosi...
Durability & Sustainability                          SOCIAL                     No congestion from                      ro...
Upcoming SlideShare
Loading in …5
×

Gb2011 murray cook_egga

264 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
264
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
5
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Gb2011 murray cook_egga

  1. 1. SUSTENTABILIDADE Longevidade e estética paraobras em estruturas metálicas Murray Cook Executive Director European General Galvanizers Association www.egga.com www.intergalva.com
  2. 2. “The long-term durability provided by galvanizing isachieved at relatively low environmental burden interms of energy and other globally relevant impacts,especially when compared to the energy value of thesteel it is protecting”Galvanizing and Sustainable Construction: A Specifiers’ Guide (2008)Editor: Professor Tom Woolley (Architect and ‘Green Building’ activist)
  3. 3. EU Construction Products Regulation (2011)7. Sustainable use of natural resources The construction works must be designed, built and demolished in such a way that the use of natural resources is sustainable and in particular ensure the following:(a) reuse or recyclability of the construction works, their materials and parts after demolition;(b) durability of the construction works;(c) use of environmentally compatible raw and secondary materials in the construction works.
  4. 4. EU Construction Products Regulation (2011)7. Sustainable use of natural resources The construction works must be designed, built and demolished in such a way that the use of natural resources is sustainable and in particular ensure the following:(a) reuse or recyclability of the construction works, their materials and parts after demolition;(b) durability of the construction works;(c) use of environmentally compatible raw and secondary materials in the construction works.
  5. 5. Durability• For hot dip galvanizing – long-term durability is a proven fact.• Accelerated testing and estimations are unnecessary• ‘Case history’ projects demonstrate durability in a range of environments
  6. 6. The Importance of Case History Data for Galvanized Structures• Zinc corrosion performance is predictable• Extensive database of performance galvanized structures worldwide• Reliability and confidence for designers and users EGGA
  7. 7. Galvanizing Case History Stainsby Hall Bridge Cleveland United Kingdom EGGA
  8. 8. Location of the Bridge Semi-industrial environment, near the English industrial town of Middlesbrough
  9. 9. • Stainsby Hall Farm Access Bridge• Cleveland A19/A174 interchange• Erected in 1974
  10. 10. Construction Details• 25 tonnes of structural steel beams• Longest beam = 20 metres• Original coating thickness = >150 μm**beams of this section thickness will typically exceed the minimum standard requirements (85 μm) in this way.
  11. 11. Detailed Inspection : 1998• Visual Examination• Coating Thickness Readings• Adhesion Testing• Analysis of Corrosion ProductsInspection conducted byScott Wilson Kirkpatrick Engineersand Steel Protection Consultancy
  12. 12. Web and underside of top flange• Spangled appearance evident• Dirt contamination but no zinc salts
  13. 13. End of beam in contact with concrete• No signs of rusting near contact points
  14. 14. Lower face of bottom flange (over road)• Build-up of zinc salts• Average zinc coating of 101 μm
  15. 15. Stainsby Hall Bridge• Predicted corrosion rate when built: 4 μm /year• Actual average corrosion rate: 2-3 μm/year• Corrosion rate observed agrees with EN ISO 14713 and site specific data• Corrosion rate expected to decrease further with lower acidity of environment Maintenance-free life time of >75 years is expected
  16. 16. Durability & Sustainability SOCIAL No congestion from road closures for maintenance GALVANIZING 75 Years Maintenance- free structure life ENVIRONMENTAL ECONOMIC Reduced pollutionReduced life cycle from congestion costing for Reduced energy and governments emissions from maintenance painting

×