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2005-6 Work Plan Discussion July 14, 2005

2005-6 Work Plan Discussion July 14, 2005. Opportunities in 2005/6. Extension of Current Technical Thrusts Subgrade & Stabilization -- Tutumluer/Thompson Raw Materials -- Struble PCC Pavement -- Roesler/Lange New Directions Pavement Icing Hazards -- Dempsey

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2005-6 Work Plan Discussion July 14, 2005

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  1. 2005-6 Work Plan Discussion July 14, 2005

  2. Opportunities in 2005/6 • Extension of Current Technical Thrusts • Subgrade & Stabilization -- Tutumluer/Thompson • Raw Materials -- Struble • PCC Pavement -- Roesler/Lange • New Directions • Pavement Icing Hazards -- Dempsey • Asphalt overlays -- Buttlar/Al-Qadi • Plantings, Wildlife and Safety -- Herricks/Branham

  3. OMP Continuing Project for 2005-06 Subgrade Soil Support and Stabilization Co-PIs: Erol Tutumluer & Marshall R. Thompson RA: H.S. Brar • Additional soil-lime testing will be conducted in the laboratory for soil samples with different lime percentages and lime sources • Cooperate with OMP in the development of construction monitoring guidelines for 9L-27Rsubgrade soil lime modification & stabilization

  4. OMP Continuing Project for 2005-06 Subgrade Soil Support and Stabilization (Continued) • Develop and recommend to OMP a program to evaluate the completed lime stabilization construction as related to the “k-150” requirement (U of I will cooperate with OMP in implementing the program) • Continue to work with OMP on current and future subgrade soil support and stabilization issues for OMP runways/taxiways

  5. Proposed CEAT Materials Research for 2005-6 -- Leslie Struble • Study impact of potassium acetate deicing chemicals on ASR (proposal submitted) • Measure effectiveness of ASR mitigating admixtures

  6. PCC Pavements -- Roesler/Lange • Continue toward current goals • Concrete mix design, volume change, aggregate size, slab load transfer • Saw cut timing • Extend effort toward field instrumentation • Validate material and pavement models • Use of recycled concrete • Internal curing

  7. Pavement Icing HazardsBarry Dempsey • Adapt the Enhanced Integrated Climatic Model (EICM) to real time pavement temperature monitoring for icing and other winter hazard conditions. •Basic Issues: Icing conditions are not only a function of the air temperature but the temperature history in the pavement leading up to the possible icing condition. Pavement temperatures and air temperatures can be quite different based on the climate and pavement temperature history.The EICM is used extensively in the new AASHTO Design procedure and has been found to work very well in that application.

  8. Pavement Icing Hazards • The EICM operates on hourly climatic data and predicts pavement temperatures with a high level of accuracy. The model has evolved over Dempsey’s 30 plus years of research and is quite sophisticated. It operates on local climatic data input. Through real time use of this model maintenance can monitor real time temperatures in the pavement so as to project the probability levels for icing or slippery surface conditions. •Goal: Better scheduling for anti icing chemical applications and more economical control of application rates

  9. Asphalt Overlays: Reflective Cracking Causes and Prevention William G. Buttlar, Ph.D., P.E. Imad Al-Qadi, Ph.D., P.E. University of Illinois at Urbana-Champaign

  10. 1) Reflective Cracking in Airport Overlays 2) Mechanism of Reflective Cracking • - Do we need any modification in the current design? • - Is there any way to reduce the maintenance cost • or to delay reflective cracking? • What analysis tools are needed? Environmental and Load Related Factors Field Performance 3) Key Factors 4) Tools • Asphalt Overlay and interlayer properties • Load transfer between the underlying concrete slabs • Subgrade support • Structural condition of the underlying slabs • Fracture mechanisms (crack initiation and propagation) • Bonding condition between slabs and underlying layer LAB Testing Computer Modeling

  11. Cutting-Edge Testing and Analysis Tools Laboratory Tests FE Modeling Multi-scale Modeling Material Properties Image Processing

  12. Related Studies – Tech Transfer • FAA Overlay Study (2002-2005) • NSF GOALI Study (2002-2006) • FHWA Pooled Fund Thermal Cracking Study (2004-2006) • IDOT Reflective Cracking Study (2005-2008)

  13. Analysis of Suitability of Soils at O’Hare to Support Turfgrass Growth • Dr. Bruce Branham • Department of Natural Resources & Environmental Sciences, UIUC

  14. GPR Applications in Pavements • Quality control for new construction • Diagnostic tool for existing structures • Detect flaws • Detect moisture • Measure concrete slab and base thicknesses • Detect rebar locations and estimate cover depth

  15. Slab/base interface Transversal reinforcement Reinforcement and Layer Interface Detection Using GPR CRCP (ground-coupled)

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