INSIDE THE DOT
South Dakota Department of Transportation
Use of Expanded Polystyrene Blocks for Bridge Abutments
Lateral creep movement of bridge abutments is a well known phenomenon in South Dakota, and is generally thought to be caused by buildup of earth pressures behind the abutments, embankment movements under its own weight and yielding of the soils underlying the embankment or the bridge abutment. Excessive abutment movements have been known to cause high compressive stresses in the bridge girders during periods of thermal expansion and without corrective action, may also result in buckling and twisting of the girders and buckling of the bridge deck.
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