Northeast Prestressed Products, LLC

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Prestressed Concrete Box Beams

A staple in the Prestressed Concrete beam market, the box beam continues to demonstrate its flexibility by providing design options using boxes in an adjacent arrangement with either a cast-in-place concrete deck or an asphalt paved surface or a spread arrangement with stay-in-place forming and a poured concrete deck.

Box beams are fabricated with void material using preformed cellular polystyrene that meets the requirements of ASTM-C578, Type 1.  Void forms are watertight and resistant to breakage and deformation during concrete placement. Because the void is polystyrene, virtually any size or shape can be accommodated to meet project needs.

Adjacent Non-Composite Box

Adjacent Composite Box

Spread Box



Span lengths for given beam depths are based on actual beams designed following PennDOT DM-4, 2007.  Information is provided as a general guide for selecting beam depths at the preliminary stages of design.