United States Department of Transportation
i
Self-consolidating concrete repairs on Interstate 25 bridge abutments north of Mead.
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2013-07-01
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures;NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance;
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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.
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