grouted after stressing. For unbonded anchors, the
free stressing length is provided with bond breaker
to prevent bonding with the grout or two-stage
grouting is performed.
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2.4.1
General
Fabrication of the anchors shall be as recommended by the suppliers.
Anchors shall be completely assembled with all [centralizers], [spacers],
grout and vent tubes and corrosion protection prior to insertion into the
hole. Fabricated anchors shall be protected, transported and stored in a
manner to prevent contamination or damage to any components.
2.4.2
Tendon
All spacers for multiple element tendons shall be located as indicated on
the approved shop drawings. Strands shall be furnished full length with no
splicing or coupling permitted. Tendon material shall be unblemished and
free of pitting, nicks, grease, or injurious defects. When required to
maintain the tendon location within the hole, centralizers shall be
provided at a maximum of [3] [_____] meter [10] [_____] foot intervals
center-to-center throughout the bond length. [Spacers shall be provided at
a maximum [3] [_____] meter [10] [_____] foot intervals center-to-center
throughout the bond length.] The entire bond length of the tendon shall be
free of dirt, lubricants, loose rust, corrosion-inhibiting coatings or
other contaminants.
2.4.3
Bond Breaker
Bond breaker for free stressing length of unbonded anchors shall consist of
smooth polyethylene tubing, minimum wall thickness 1 mm 0.04 inch, or
smooth PVC tubing, minimum wall thickness 1.0 mm 0.04 inch.
2.4.4
Vent Tubes
Vent tubes used during grouting operations, if necessary, shall be any
appropriate type for the job, as recommended by the supplier of the anchors.
2.4.5
Grout Tubes
Grout tubes shall be polyethylene tubing or as recommended by the anchor
manufacturer and approved by the Contracting Officer. Inside diameter of
grout tubes shall be adequate to fully grout the entire hole.
2.4.6
Corrosion Protection
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NOTE: Type of corrosion protection required will be
determined in accordance with PTI 4, Paragraph 5.3.
Fusion bonded epoxy coatings may contain holidays
and may be damaged during fabrication and
installation, therefore epoxy coating should not be
relied on to provide adequate corrosion protection.
The grout or encapsulation must be included in the
corrosion protection design. The paragraphs on
encapsulation will be included for Class I
(Encapsulated Tendon) corrosion protection.
Additional corrosion protection may not be required
SECTION 02490
Page 26
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