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SUSTENTABILIDADE
 Longevidade e estética para
obras em estruturas metálicas
                  Murray Cook
                Executive Director
      European General Galvanizers Association
                 www.egga.com
               www.intergalva.com
“The long-term durability provided by galvanizing is
achieved at relatively low environmental burden in
terms of energy and other globally relevant impacts,
especially when compared to the energy value of the
steel it is protecting”
Galvanizing and Sustainable Construction: A Specifiers’ Guide (2008)
Editor: Professor Tom Woolley (Architect and ‘Green Building’ activist)
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.
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.
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
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
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*




*beams of this section thickness will typically exceed the minimum standard requirements (85
   μm) in this way.
Detailed Inspection : 1998
•   Visual Examination
•   Coating Thickness Readings
•   Adhesion Testing
•   Analysis of Corrosion Products

Inspection conducted by
Scott Wilson Kirkpatrick Engineers
and Steel Protection Consultancy
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
• 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
Durability & Sustainability

                          SOCIAL
                     No congestion from
                      road closures for
                        maintenance




                      GALVANIZING
                         75 Years
                      Maintenance-
                      free structure
                            life
                                           ENVIRONMENTAL
   ECONOMIC                                Reduced pollution
Reduced life cycle                          from congestion
   costing for                            Reduced energy and
  governments                               emissions from
                                          maintenance painting

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Gb2011 murray cook_egga

  • 1. SUSTENTABILIDADE Longevidade e estética para obras em estruturas metálicas Murray Cook Executive Director European General Galvanizers Association www.egga.com www.intergalva.com
  • 2. “The long-term durability provided by galvanizing is achieved at relatively low environmental burden in terms of energy and other globally relevant impacts, especially when compared to the energy value of the steel it is protecting” Galvanizing and Sustainable Construction: A Specifiers’ Guide (2008) Editor: Professor Tom Woolley (Architect and ‘Green Building’ activist)
  • 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. 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. 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. 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. Galvanizing Case History Stainsby Hall Bridge Cleveland United Kingdom EGGA
  • 8. Location of the Bridge Semi-industrial environment, near the English industrial town of Middlesbrough
  • 9. • Stainsby Hall Farm Access Bridge • Cleveland A19/A174 interchange • Erected in 1974
  • 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. Detailed Inspection : 1998 • Visual Examination • Coating Thickness Readings • Adhesion Testing • Analysis of Corrosion Products Inspection conducted by Scott Wilson Kirkpatrick Engineers and Steel Protection Consultancy
  • 12. Web and underside of top flange • Spangled appearance evident • Dirt contamination but no zinc salts
  • 13. End of beam in contact with concrete • No signs of rusting near contact points
  • 14. Lower face of bottom flange (over road) • Build-up of zinc salts • Average zinc coating of 101 μm
  • 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. Durability & Sustainability SOCIAL No congestion from road closures for maintenance GALVANIZING 75 Years Maintenance- free structure life ENVIRONMENTAL ECONOMIC Reduced pollution Reduced life cycle from congestion costing for Reduced energy and governments emissions from maintenance painting