Raw Materials Study at Chicago OHare Intl Airport

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Raw Materials Study at Chicago OHare Intl
Airport

• by
• Francis B. Nelson III
• Leslie J. Struble

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Overview

• Material Suppliers
• IDOT Testing
• Freeze-Thaw (F/T) Performance
• Alkali Silica Reaction (ASR) Information
• Shrinkage

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Material Suppliers

• Sources identified for
• Coarse Aggregate
• Fine Aggregate
• Cement
• Mineral Admixtures

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IDOT Approved Materials

• IDOT has developed lists of Approved Material
  Suppliers
• Lists updated constantly
• Based on extensive testing programs
• Available online
• http//www.dot.state.il.us/materials/materialslist
  .html

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IDOT Testing

• Every supplier is tested by IDOT
• Tests constantly updated
• Only IDOT tests allowed
• Approval Process available from IDOT
• Majority of producers only use IDOT approved
  materials near Chicago

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Gradations Tech Note

• IDOT Art. 1004 vs. ASTM C33

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Freeze-Thaw Performance

• Met with IDOT to discuss their experience
• Determined that their F/T rating list of approved
  suppliers is best suited for this project
• IDOT has extensive testing program in place for
  quarries to be approved
• Use the 40 Year Extended Life Pavement Design List

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F/T Testing Program

• Each quarry tested bi-annually
• 5 Samples run for 350 cycles
• CA for concrete must be of quality A
• Prior to F/T Testing IDOT tests for
• Soundness
• Los Angeles Abrasion
• Minus 200 sieve material
• Maximum Deleterious Material

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Quality A Standards
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Top Size Allowable
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Additional F/T Testing

• If larger top sized gradations are deemed
  beneficial
• Coordinate with IDOT to test for larger sizes
• Currently use 0.025 expansion for 40 year Design
  Life List Approval

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ASR Information

• Good performance in Chicago area
• IDOT has provided
• Preliminary specification
• List of approved fine aggregate suppliers
• UIUC has extensive experience with ASR
• Samples will be obtained to do testing in our lab
• Compare natural sand vs. manufactured sand

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Drying Shrinkage

• Study will be performed on different top size
  aggregate gradations
• CAs 5, 7, 11, 14
• Along with a blend of CA 1 7
• Additional Study to test different cements
• Future work

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Thank You

• Any questions/comments?