PRESTRESSED HIGHWAY PAVEMENT IN SERVICE

ON 14 JULY 1971 THE FIRST PRESTRESSED PAVEMENT SLAB PLACED IN SERVICE ON A HIGHWAY IN THE UNITED STATES WAS PLACED ON AN INTERCHANGE RAMP NEAR MILFORD, DELAWARE. THE SLAB IS 14 X 300 FEET. TEFLON COATED, SEVEN-WIRE STRANDS 0.6 INCH IN DIAMETER, SURROUNDED BY SILICON GREASE AND ENCASED IN A POLYPROPYLENE SHEATH, WERE SPACED ACROSS THE WIDTH OF THE SLAB ON 28-INCH CENTERS 3.5 INCHES BELOW THE SURFACE OF THE CONCRETE. THE SLAB, WHICH IS 6 INCHES THICK, WAS PLACED ON 4 INCHES OF CEMENT-MODIFIED SOIL. THE TRANSVERSE JOINTS AT THE ENDS OF THE SLAB CONSIST OF A 7-INCH (14.75 LB/FT) CHANNEL WITH 0.6875-INCH-DIAMETER HOLES TO ACCOMMODATE THE STRANDS. A PLATE 0.75-INCH THICK AND 6 INCHES WIDE WAS PLACED FOR THE FULL DEPTH OF THE WEB TO ACT AS A BEARING PLATE. LOAD TRANSFER TO THE TRANSITION SLAB WAS PROVIDED BY 1.25-INCH-DIAMETER DOWEL BARS THAT WERE 18 INCHES LONG. PRESTRESSED JACKS TENSIONED THE STRANDS, TWO AT A TIME, TO 40 KIPS EACH. THE LAYING AND TENSIONING PROCEDURES ARE DESCRIBED. IT IS EXPECTED THAT ABOUT A YEAR WILL BE REQUIRED TO INDICATE THE PERFORMANCE OF THE SLAB. ANOTHER PRESTRESSED PAVEMENT IS TO BE BUILT IN THE AUTUMN OF 1971 ON AN ENTRANCE ROAD TO DULLES AIRPORT IN WASHINGTON D.C. IT WILL BE 3200 FEET LONG AND WILL HAVE PANELS AS LONG AS 750 FEET BETWEEN JOINTS.

  • Supplemental Notes:
    • Vol 114, No 10, P 56, 2 PHOT
  • Publication Date: 1971-10

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Filing Info

  • Accession Number: 00215462
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 22 1972 12:00AM