larger diameters.
The trumpet shall be welded to the bearing plate.
2.2.2
Prestressing Steel Couplers
[Prestressing steel couplers for bars shall be capable of developing 100
percent of the minimum specified ultimate tensile strength of the
prestressing steel.] [Splicing of strand will not be permitted.]
2.2.3
Centralizers and Spacers
Centralizers [and spacers] shall be fabricated from plastic, steel or other
approved material which is nondetrimental to the prestressing steel. Wood
shall not be used. The centralizer shall be able to support the tendon in
the drill hole and position the tendon so a minimum of 13 mm 0.5 inch of
grout cover is provided. Centralizers and spacers shall permit grout to
freely flow up the drill hole.
2.2.4
Casing
Casing shall be [steel pipe] [or] [steel tube] [selected and sized by the
Contractor where required. Casing shall be the necessary type and size to
permit proper drilling of anchor holes and placing of anchors as specified
herein and shown on the drawings. Straightening of casings and machining
of joints may be necessary in order to meet specified alignment tolerances.]
2.2.5
Anchorage Covers
**************************************************************************
NOTE: When the anchorage recess is to remain open,
delete the last sentence. If anchor head has 75 mm
(3 inches) or more of concrete or non-shrink grout
cover, the anchorage cover may be eliminated and the
anchorage coated to prevent corrosion.
**************************************************************************
Anchorage covers shall be fabricated from steel or plastic. The material
used shall not be subject to attack by cement, corrosion-inhibiting greases
or the environment. If plastic is used, it shall not be susceptible to
ultraviolet light degradation. The cover shall be securely attached to the
bearing plate. If the cover is to be grease filled, the cover must form a
permanent watertight enclosure for the anchorage device.
2.3
GROUT
2.3.1
Cement
**************************************************************************
NOTE: When the ambient rock temperature is below 10
degrees C (50 degrees F), Type III cement may be
necessary.
**************************************************************************
ASTM C 150, Type I, II, III or V.
2.3.2
Water
Water shall be fresh, clean, potable, and free from injurious amounts of
sewage, oil, acid, alkali, salts, or organic matter.
SECTION 02490
Page 23
Previous Page
