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O’Hare Modernization Program 2.2 Raw Materials

yakov avatar
yakov
12 diapositives · 268 Views · Jan 20, 2013

The O'Hare Modernization Program's Raw Materials kickoff meeting, held on October 28, 2004, focused on assessing the suitability of materials for concrete mix design and durability. Key objectives included evaluating aggregates, cementitious materials, and admixtures to develop a comprehensive database of properties. Testing procedures covered crucial aspects such as gradation, adsorption capacity, freeze-thaw performance, and alkali-silica reaction mitigation strategies. The plan emphasizes selecting quality sources and materials to ensure the durability and longevity of the project.

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O’Hare Modernization Program 2.2 Raw Materials
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  1. O’Hare Modernization Program2.2 Raw Materials Leslie J. Struble Francis B. Nelson Kickoff Meeting, October 28, 2004

  2. Proposed Objectives • Assess and test suitability of materials • Aggregates • Properties required for mix design • Properties required for durability • Cementitious materials • Suitability in combination with other materials • Admixtures • Suitability in combination with other materials • Provide database of properties • Make recommendations concerning materials

  3. Aggregates • Geometric properties • Size distribution • Physical properties • Adsorption capacity • Hardness • Durability • Freezing and thawing • Alkali-silica reaction • Alkali-carbonate reaction

  4. Testing Procedures • Gradation • ASTM C136 • ASTM C33 • Adsorption Capacity • Bulk Density • ASTM C29 • Abrasion Resistance • ASTM C535 • Analysis • X-ray fluoresence • X-ray diffraction • Optical Microscopy

  5. Freezing and Thawing • Freezing when saturated causes expansion and cracking (D-cracking) • Expansion affected by • Porosity • Permeability • Degree of saturation • Size • Mitigation • No mitigation is possible, avoid susceptible aggregate

  6. Testing Procedures • ASTM C 666 • Procedure A – freeze and thaw in water • Procedure B – freeze in air, thaw in water • Measure ultrasonic resonance frequency • IDOT Modified Method • Procedure B using length change

  7. Alkali-Silica Reaction • Chemical reaction • Alkalies in cement and silica in aggregate • Reaction forms a gel that adsorbs water and expands • Expansion causes severe cracking • Mitigation • Mineral admixtures • Low-alkali cement Micrograph courtesy of D. Cong, WJE

  8. Testing Procedures • Petrographic analysis • ASTM C289 • Quick chemical method (24 hours), useful for quality control • ASTM C1260 • Accelerated mortar-bar method (16 days) • ASTM C1293 • Concrete test (1 year), most reliable

  9. IDOT Experience with Chicago Quarries • Extensive database of quarries with approved sources • Freeze/thaw performance, excellent durability • ASR performance, low expansion

  10. Work Done during Fall 2004 • Reviewed IDOT aggregate database • Learned IDOT F/T testing procedure

  11. Work Planned for 2004-05 • Select 5 quarries based on IDOT database to avoid deterioration due to F/T, ASR • Measure properties needed for mix design • Test aggregates for F/T, ASR • If ASR possible, select and test cements and mineral admixtures • If F/T possible, reject quarry

  12. Possible Work in Year 2 • If aggregate alkali-reactive, identify suitable cements and mineral admixtures • Based on recommended mix proportions, identify suitable cements and chemical admixtures • Test cement-admixture combinations for performance, robustness