Self-consolidating concrete repairs on Interstate 25 bridge abutments north of Mead.

Details

• Creators:
  Kiousis, Panos D. ; Whitcomb, Brent L.
• Corporate Creators:
  Colorado School of Mines
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  Bridge Abutments Bridge Decks Girders Highway Bridges Highway Maintenance Interstate Highways Rehabilitation (Maintenance) Reinforcing Steel Self Compacting Concrete
• Publication/ Report Number:
  CDOT-2013-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Colorado
• Corporate Publisher:
  Colorado. Dept. of Transportation. Research Branch
• NTL Classification:
  NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance
• Abstract:
  In August of 2011 CDOT performed maintenance on Interstate 25 bridges D-17-DA and DB on I-25 north of Mead, CO.
  
  The maintenance was performed using self-consolidating concrete (SCC), and the methods were based on a study performed
  
  by the Colorado School of Mines under contract number 09 HTD 00027, and published in a CDOT 2007 report titled “Study
  
  on the Use of Self-Consolidating Concrete for the Repair of the Mead Bridges on I-25.”
  
  The concrete abutments at the Mead Bridges on I-25 deteriorated in recent years due to unexpected freeway embankment
  
  movements. In many places the concrete had spalled off and exposed the steel reinforcement. The north abutments were
  
  especially affected by the embankment progressive movement towards the bridge. This movement forced the abutment
  
  against the steel girders, and progressed to the point where the abutment cover was crushed and the girders came in direct
  
  contact with the abutment reinforcement. It also resulted in buckling of the concrete deck, which was lifted off of the
  
  girders, resulting in a gap between the deck and the girders.
  
  To mitigate the problems described above, CDOT decided to “lock” the girders to the abutments with the use of SCC. The
  
  intent to use SCC was based on the need to have a flowable, yet stable concrete that could encapsulate the ends of the steel
  
  girders and the space in between them, without leaving voids at the interface of the new concrete and the existing deck slab,
  
  and without the need to vibrate the new concrete during placement. To achieve these goals, a high flowability concrete was
  
  designed with the intent of placing it through a number of holes at the deck within the encased area.
  
  One year after completion of the repair, inspections of the abutments were made in order to verify the performance of the
  
  repair after a full cycle of seasonal temperature changes. The inspection found that the concrete placed around the girders is
  
  performing as intended. No significant cracking or other indications of concrete failure were seen.
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:cec870678f954a58e2f9129db21ffa01d50a988b869cef52a6b5a224b9ed6ccf7d77099b2e59c05fcbabc014407bc90699ac565575690c9152a1e146812b3392
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/26096/dot_26096_DS1.pdf
• File Type:
  [PDF - 636.36 KB ]