Question: How can vertical pre-release cracks in prestressed concrete beams be avoided? Answer: Vertical cracks have been observed in prestressed concrete beams before the prestressing strands are released. Their occurrence appears to be more frequent in deep, long-span members. These
GREAT BEND BRIDGE OVER THE SUSQUEHANNA RIVER
Thomas Drda, Federal Highway Administration and Bryan Spangler, Pennsylvania Department of Transportation The Pennsylvania Department of Transportation (PENNDOT) has been involved with high performance concrete (HPC) for several years. A performance based specification has been developed and several bridge decks
LARGE-SCALE USE OF HPC FOR BRIDGES AT TORONTO AIRPORT
Ken Bontius, Hatch Mott MacDonald Ltd. As part of the redevelopment of Toronto’s International Airport, Canada, a multi-level road system providing access to three levels of a new terminal building was required. The elevated road structure was arranged as a
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NEW JERSEY’S MOVE TO HPC
Harry A. Capers, Jr., New Jersey Department of Transportation and Hani Nassif, Rutgers University High performance concrete (HPC) is now required for use in bridge decks on the state highway system in New Jersey. The use of HPC in prestressed