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The role silica fume plays in producing resilient, high-performance (precast) concrete

The role silica fume plays in producing resilient, high-performance (precast) concrete. Tony Kojundic, FACI Director , Silica Fume Association. Federal Railway Administration Research Grant. Silica Fume Association FHWA cooperative agreement (10yr); HPC Bridges.

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The role silica fume plays in producing resilient, high-performance (precast) concrete

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  1. The role silica fume plays in producing resilient, high-performance (precast) concrete Tony Kojundic, FACI Director, SilicaFume Association

  2. Federal Railway Administration Research Grant Silica Fume Association FHWA cooperative agreement (10yr); HPC Bridges. University of Illinois – Urbana Tourney Consulting Group

  3. Calcium Silicate Calcium Hydroxide Cement + water C-S-H + CH + other phases Pozzolanic reaction: Calcium Silicate CH (from PC hydration) Pozzolan + C-S-H + other phases Hydration of Portland cement:

  4. Relative Reduction in Diffusion Coefficients with Silica Fume replacement. w/cm – 0.35

  5. MN, I-35W 20% Fly ash 6% SF 0.38 w/cm

  6. Largest HPC bridge in NA.I-10 Twin-span, 3-lane 2-shoulders, 5.5 mi. each.320,000 cy, 100-yr service life.

  7. Largest HPC bridge in NA.I-10 Twin-span, 3-lane 2-shoulders, 5.5 mi. each.320,000 cy, 100-yr service life. www.Life-365.org

  8. I-10 Twin-span: Precast piles-girders-bents 25% Fly ash 8% Silica fume 0.35 w/cm 8000psi @20hr

  9. Precastconcretecuring and resultingdiffusion.

  10. Bear River Bridge – Great Salt Lake Constructed 1958, wood frame, replacement 2007

  11. Kinsua Dam 1983, stilling basin repair.Constructed 1967, 1st repaired 1976

  12. Stilling basin – 1983 repair.f ’c 13,000psi @ 28d. 15% SF, w/cm 0.28.Highest specified concrete strength in US at the time.

  13. Program Summary Demonstrate and quantify for performance-based specification development the durability properties of the HPC; F/T, ASR Mitigation, Permeability, & Abrasion resistance. Simplify the production of HPC to achieve those properties in the precast environment. Provide an economical review and life-cycle assessment (LCA) of the conventional and HPC used in the program.

  14. I-40 45 miles E. of Flagstaff, AZ Elevation 5,185 Deck replacement Thank you. 583 pcy total cementitious 450 pcy Cement 18% Fly ash 4% Silica fume w/cm – 0.43 www.silicafume.org

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