Midwest Concrete Consortium

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Midwest Concrete Consortium

• April 21, 2005

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Blends with Silica FumeSF CementTerCem 3000

• Oscar Tavares

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Consumption Facts

• US Demand
• 110 million tons
• 18 million tons imported
• 1.5 million tons of Blended Cements
• World Demand
• 1.8 billion tons
• China requires 700 million tons

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Highways Bridges 8.3 Billion Per Year
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Macrocell Corrosion in Concrete
Salty Water
Cl -
H2O
Fe(OH)2
OH-
O2
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Consequences of Corrosion in Concrete
Cracking
Spalling
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Consequences of Corrosion in Concrete
Delamination
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Consequences of Corrosion in Concrete
Loss of bond
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Consequences of Corrosion in Concrete
Loss of confinement
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What is Silica Fume?
Very fine noncrystalline silica produced in
electric arc furnaces as a byproduct of the
production of elemental silicon ..
-- ACI 116R
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Silica Fume
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Silica Fume

• Byproduct silicon, ferro-silicon metal industry
• Recovered from flue gas

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Silica Fume Blends
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Technical Benefits of SF Cementand TerCem 3000

• Benefits
• Pore Refinement
• Early Age Strength
• ASR Resistance
• Sulfate Resistance
• Consumes CH

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Advantages of SF Cementand TerCem 3000

• Strengthening Interfacial Zones
• Consumption of Calcium Hydroxide

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Specifications

• ASTM C595 Type I(PM)
• AASHTO M240 Type I(PM)
• Various State DOTs

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Lafarge SF Cement

• A Portland based cement preblended with 8 silica
  fume
• ASTM C595 Type I(PM)
• AASHTO M240 Type I(PM)
• Design Requirements
• 10,000 PSI _at_ 28-days
• lt1,000 coulombs _at_ 28-days
• Typical Mix Design requires 658 lbs/cuyd

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Physical CharacteristicsComparisons

• SF Blends
• Blaine Fineness 550 to 650
• Specific Gravity 3.06 3.10
• 70-92 Portland Cement
• 25-0 Slag Cement
• 5-8 Silica Fume

• Type I/II
• Blaine Fineness 380
• Specific Gravity 3.14

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SF Cement - Applications
R. D. Hooton, P. Pun, T. Kojundic, P. Fidjestol,
Influence of Silica fume on Chloride Resistance
of Concrete, Proc. PCI/FHWA, 1997
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What Contributes to thePerformance Benefits?
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Tercem 3000
Control
Slag
Silica Fume
Workability
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Reactivity
Strength
Age
Thomas, 1997
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Chloride Permeability
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ASR Expansion Acl. Mortar Bar Test (Spratt
Aggregate)
Expansion lt 0.10
Expansion gt 0.10
Siebert Thomas, 1996
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Sulphate Resistance
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SF Cement TerCem 3000Applications

• High Strength
• Abrasion
• Permeability
• Chemical durability
• Shotcrete

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SF Cement - Applications

• High Strength
• Abrasion
• Permeability
• Chemical durability
• Shotcrete

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SF Cement - Applications
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HPC
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Parking Garage
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High StrengthColumns

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Industrial Floors
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Water Tanks
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Shotcrete
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Shotcrete
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Concrete Pipe
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Blends with Silica Fume

• Thank you for your time
• Questions?