CASE STUDY Runway 12R-30L Lambert St. Louis International Airport
Reconstruction of Runway 12R-30L Lambert St. Louis International Airport Sponsor: City of St. Louis Design: Crawford, Murphy and Tilly Inc. CM: Kwame/Green Joint Venture Contractor: The Harper Company
Runway 12R-30L Runway 12R-30L
Airport Program Runway 12R-30L identified in Airport s Pavement Management System Key Challenges Key Operational Airfield Pavement Feature Size/Scale of Runway too big to replace all at once Programmed as partial Keel Section replacement Initial Investigation/Recommendation planned Budget = $10 Million
Project Development & Formulation OWNER S CONSIDERATION AND OBJECTIVES Transition from Large to Medium Hub Maintain 524 acres of airfield pavement Replacement value of over $650 million Pavement Management Strategy Majority of pavements constructed from 1978 to 1983 Strategic repair initiative aimed at reducing peak in infrastructure needs Budget $8-12 million in annual rehabilitation funding
Investigation/Recommendation Phase Records Research Pavement Condition Study (PCI) & Analysis Testing Program Coring Falling Weight Deflectometer Ground Penetrating Radar Petrographic Investigation Recommendation
Project Development & Formulation FAA Input, Comments and Priorities AIP $ for major rehab, not for maintenance Airport must justify CPR costs Preferred larger full reconstruction areas Limited participation to center 150 of 200 runway Design should facilitate future reconstruction Willing to provide additional funding to increase reconstruction areas
Construction History
Construction History
PCI Survey Overall PCI 68
PCI Survey Runway Distress
PCI Survey Distress Development
PCI Survey Crack Map
PCI Survey Crack Map
PCI Survey Sample Unit Analysis
PCI Survey Distress Development
Testing Program Pavement coring Falling Weight Deflectometer Measure of structural integrity of pavement Ground Penetrating Radar Determine thickness of pavement layer Look for anamolies Conclusion: Finite element analysis projected 20 years of remaining structural capacity. Analysis Performed by Engineering & Research Intl. (ERI)
Petrographic Testing Confirmed presence of Alkali-Silica Reaction (ASR) Interviewed Maintenance Staff Continued Monitoring
Project Development & Formulation Reconstruction vs. Concrete Pavement Restoration (CPR) Full reconstruction = $60-$80 million Fully CPR = $4.5 million Recommendation = combination of reconstruction and CPR to fit budget
Recommended Alternative $15.5M Construction $450k in CPR 79,000 SY (32%) Reconstructed
Project Development & Formulation Life Cycle Cost Analysis Alternatives First Cost $/yd2 Present Value Life Cycle $/yd2 Full Rehabilitation, Year 1 274.00 182.72 Recommended Option - Year 0, Full Rehabilitation - Year 10 Recommended Option - Year 0, Major Repair - Year 10, Full Rehabilitation - Year 20 32.20 124.34 32.20 42.98
Layout Plan
Design Key Design Features 18 PCC Pavement 6 Cement Treated Aggregate Drainable Subbase Subsurface Drainage System Recycled base/construction platform
Design Challenges Asbestos Typical Section from 68-72 overlay
Design Challenges Asbestos Special Removal Areas: 61,000 sy of special removal areas Isolation of work areas Worker Protection (coveralls and respirators) Keep material moist Utilize all special material in recycled base ACM Removal Area: 1,798 SY of ACM removal Certified asbestos contractor Disposed of as asbestos waste in landfill
Design Challenges Asbestos
Design Challenges BAK 12/14M
Design Challenges BAK 12/14M
Project Construction Timeline Letting: March 13, 2012 Notice to Proceed: May 29, 2012 Primary Runway Closure: June 26, 2012 Flight Check (PCC in place): October 4, 2012 Re-Open Runway: November 19, 2012
Construction
Construction
Construction
Construction
Construction
Runway 12R-30L Questions?