UNIVERSITY COLLEGE LONDON DEPARTMENT OF CIVIL AND ENVIRONMENTAL ENGINEERING

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UNIVERSITY COLLEGE LONDONDEPARTMENT OF CIVIL AND
ENVIRONMENTAL ENGINEERING

• MMFX Steel
• The Next Generation of Reinforcement

Authors Constantinos Constantinou Ioannis
Mitsingas Supervisor Dr C. Arya
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Corrosion Costs in all Industrialized
Nations
amount to 3 of the GNP of each country.

• H.H. UhHg (M.I.T) T.P. Hoar (University of
  Cambridge, U.K.)

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Microcomposite Multistructural Formable Steel

• Awarded, patented chemical composition and
  unique steel microstructure minimizes the
  formation of micro galvanic cells in the steel
  structure, preventing corrosion initiation
• High Design Yield Strength allows for design
  reduction of rebar quantities and simplifies
  installation

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Comparison to normal steel
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Mechanical Properties
Yield Strength 1130 GPa
Elastic Modulus 200 GPa
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Current Usages

• Bridges
• High Rise Buildings
• Residential Housing in Coastal Areas

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Constructing the Beam
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Steel Cage Fabrication
Cross Section
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Comparable Ribbing, but Resistance to corrosion
evident in colour difference
120 mm Link Spacing
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Beam Prior to Instrumentation
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Testing
Theory
Practice
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Deflection Analysis
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Beam 2 Fails in flexure at 61.3 kN
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Crack Widths

• Crack widths analysis carried out
• to BS8110 and EC2 for both beams

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Beam 2 First Crack Appears at 7.5 KN
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Crack widths

• All actual cracks are smaller than the predicted
  ones
• MMFX steel is corrosion resistant so larger
  cracks can be acceptable

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Crack Propagation At 30 kN
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Marketing Prospects
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• Cost is estimated to be 2-3 times the price of
  Grade 460 Steel
• Only produced in the USA at the moment
• but
• Higher Design Yield Strength can lead to smaller,
  more underdesigned members
• Maintenance Costs reduced/eliminated due to the
  non-corrosive nature of the steel

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Conclusion

• MMFX steel bars meet BS8110 and EC2 deflection
  and crack width criteria
• Good basis for further research
• Favourable prospects for usage in the UK and
  other parts of the world.

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Thank you
(The authors would like to assure everyone that
no beams were hurt during the making of this
project)