02515.00 1114 Section 02515 - Prestressing Reinforcement
Description
02515.00Scope - This Section includes the requirements for seven-wire strand, high tensile strength
wire, high tensile strength steel alloy bars, tendon duct and couplings.
Materials
02515.10Seven -Wire Strand - Seven -wire strand (bright wire) shall conform to the requirements of
AASHTO M 203 ( ASTM A416), Grade 270, supplement 1 (low relaxation strand), minimum ultimat e strength, 270,000 psi.
02515.20Wire, High Tensile Strength - High tensile strength wire shall conform to the requirements
of AASHTO M 204 ( ASTM A421).
02515.30Bars, High Tensile Strength - High strength steel bars shall conform to the requirements
of AASHTO M 275 ( ASTM A722).
02515.40Seven -Wire Strand Epoxy Coated Reinforcement - Epoxy coated reinforcement shall
conform to the requirements of ASTM A882.
02515.50Tendon Duct - Provide rigid galvanized steel ducts conforming to the requirements of
ASTM A653 with a coating weight of G90 for post -tensioned Structures. Transition couplings connecting rigid ducts in anchoring devices need not be galvanized. Rigid ducts may be fabricated with either welded or interlocking seams. Galvanizing of t he welded seam is not required. Provide ducts with sufficient strength to maintain their correct alignment during placing of concrete and resist denting during construction. Minimum wall thickness of ducts shall be 26 gauge for 2 5/8 inch diameter and sm aller ducts, and 24 gauge for ducts that are larger than 2 5/8 inch diameter.
02515.60Couplings - Provide couplings that develop at least 95 percent of the minimum specified
ultimate strength of the prestressing steel without exceeding anticipated set. The coupling of tendons shall not reduce the elongation at rupture below the requirements of the tendon itself.
02515.70Shipping Protection - Package prestressing steel to protect the steel against physical
damage and corrosion. Place a corrosion inhibitor that prevents rust or other results of corrosion in the package, or use a corrosion inhibitor type packaging material, or when allowed, apply directly to the steel. Provide a corrosion inhibitor that has no deleterious effect on the st eel or concrete or bond strength of steel to concrete. Immediately replace or restore damaged packaging.
Mark the shipping package with the type of corrosion inhibitor used, and the date packaged.
02515.80Acceptance - Acceptance of pre-stressing reinforcement will be according to 00165.35
and this Section.