2.2
TESTS, INSPECTIONS, AND VERIFICATIONS
The Contractor shall have required material tests performed on stressing
tendons and accessories by an approved laboratory to demonstrate that the
materials are in conformance with the specifications. These tests shall be
at the Contractor's expense.
PART 3
EXECUTION
3.1
INSTALLATION
Stressing tendons and accessories shall be installed or placed as specified
and as shown on contract and approved installation drawings. Installation
details of stressing tendons and accessories not specified or shown shall
be in accordance with ACI SP-66 or ACI 318M/318RM ACI 318/318R. Welding
shall not be performed near or adjacent to stressing tendons. Stressing
tendons shall not be installed until all welding has been completed on
supports or any part which might be in contact with the tendons.
3.1.1
Prestressing Method and Equipment
Descriptions of the proposed prestressing methods and equipment indicating
the manufacturer of all prestressing equipment, including tensioning jacks,
stress measurement gages, dynamometers and load cells or other devices for
measuring stressing loads, shall be provided by the contractor.
Descriptions shall include certified calibration records for each set of
jacking equipment and testing curves for stress measurement gages which
show that the gages have been calibrated for the jacks for which they are
to be used.
3.1.2
Installation Drawings
Detailed installation drawings for stressing tendons and accessories
showing the type and size of stressing tendons and anchorages, erection
methods, sequence of stressing and stressing calculations shall be provided
by the Contractor.
3.1.3
Anchorages
Anchorages must be set in a plane normal to the axis of the tendons such
that uniform bearing on the concrete is assured. Positive connecting
anchorages rather than gripping types shall be used for anchoring embedded
ends of tendons. Anchorages and anchor fittings shall be permanently
protected against corrosion. Parallel wire anchorage wedges or cores shall
be recessed within the members.
3.1.4
Stressing Tendons and Ducts
Protective coverings and wrappings shall be removed and each stressing
tendon shall be closely inspected to see that nicks, scoring, pits or other
damage does not exist and high strength steel bars shall be closely
inspected to assure that they are not bent and that threaded ends are in
satisfactory condition immediately prior to installation. Strand, wire and
bar tendons shall be shop or field assembled as required and positively
attached to anchorages. Type WA wire assemblies shall be anchored only
with wedge type anchorages. Stressing tendons and ducts shall be assembled
to required shapes and dimensions and placed where indicated on drawings
within specified tolerances and adequately supported. Ducts shall be
securely fastened at close intervals and grout openings and vents must be
SECTION 03230
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