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ODOT OFFICE OF PRODUCTIONMatthew Blythe, PE
Teddy Antonios, PE
USE OF GEOWALLS UNDER APPROACH SLABS
DAR-722-0635
DAR-722-0635 DISCUSSION• 3-span slab bridge replacement.
• Designed in 2006.
• Constructed in 2008.
• 102’ long bridge.
• District Concerns
• Abutment Keyway Failure
• Approach Slab Settlement
• Semi-Integral Staining
• Semi-Integral Cracking
• MSE Wall “Interface Shearing” & Material Loss
ADVANTAGE OF JOINTLESS BRIDGES
CAPPED PILE ABUTMENT – CPA-5-94
CRACKED KEYWAY
SEMI-INTEGRAL STAINING• History of appearance “disappointments”.
• Potential Staining Causes
• Backfill not draining fast enough.
• Back of joint saturated.
• Tacking of waterproofing causing puckering.
• Waterproofing damaged during backfilling.
SEMI-INTEGRAL APPROACH SLAB CRACKS
LA DOTD PROTOTYPEBRIDGES• Researched improvements to integral & semi-
integral designs.
• 2005 - LTRC Research Project #01-3ST
• Evaluated performance of several LA DOTD prototype semi-integral bridges.
• Details differed from ODOT’s standard.
• Project concluded that design performed very well.
• LA DOTD’s design incorporated a geo-synthetic wall underneath the approach slabs.
• A 6” gap was installed behind the backwall.
DAR-722-0635 DETAILS
DAR-722-0635 DETAILS
GEOWALL CONSTRUCTION
GEOWALL CONSTRUCTION
FINISHED PRODUCT
Approach Slab
6” Void
Bridge Deck
INISHED PRODUCT
ONCLUSIONDesign successfully addressed all structural issues / District concerns.
Total bridge cost was $457,500.
The geowall total cost was $26,700.
Construction did not significantly affect schedule.
After almost 3 years of service, bridge and geowalls are performing well.
There is currently no significant bumps affecting smoothness of the drive.
Due to geowalls, approach slabs should not settle.
• No anticipated loss of material due to approach slab “pumping”.
• No anticipated long-term ride ability performance issues.
Matthew Blythe, PE
(614) 752-9848
Teddy Antonios, PE
(614) 644-6626
QUESTIONS?
