stressing zone. The cure times of the resin grout
will be affected by ground or rock ambient
temperatures.
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Polyester resin grout shall consist of high strength, unsaturated polyester
resin filled with nonreactive, inorganic aggregate and a separated catalyst
contained in a tube of polyester film or glass. Gel time and cure time
shall be appropriate for the installation procedures. The polyester resin
grout shall have the following minimum properties:
Compressive Strength - 83 MPa 12000 psi.
Tensile Strength - 27.6 MPa 4000 psi.
Shear Strength - 20.7 MPa 3000 psi.
Resin cartridges with expired shelf life shall not be used.
2.3.6
Sand-Cement Grout
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NOTE: Where an excessive volume of neat cement
grout is required for pregrouting holes or grouting
holes which fail watertightness tests, sand-cement
grout may be used. The first option for grout mix
is suitable for normal applications. When a
specific strength grout is required, the second
option should be used.
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Grout for waterproofing holes, grouting holes which fail the watertightness
test, and for backfilling holes which are abandoned shall consist of a
mixture of portland cement, [fine aggregate][masonry sand] and water. [The
grout shall consist of one part portland cement and two parts fine
aggregate by volume, mixed with sufficient water to provide a uniform
consistency.] [The grout mix proportions shall be the responsibility of
the Contractor. The Contractor shall submit his proposed mix design to the
Contracting Officer for approval. The water content shall be the minimum
necessary for proper placement. Final proportions of materials shall be
based on results of tests made on sample mixtures of grout. The minimum
compressive strength of two-inch cubes, molded, cured, and tested in
accordance with ASTM C 109/C 109M, shall be [27.6] [_____] MPa [4,000]
[_____] psi.] The Contractor shall be responsible for taking, curing, and
breaking of grout test cubes for determining mix design, and all testing
shall be done by an independent laboratory approved by the Contracting
Officer. [[Soil] [Rock] conditions and temperatures shall be replicated in
the curing process.]
2.3.7
Grout for Anchor Pads
Grout for leveling bearing plates shall be nonshrink grout conforming to
ASTM C 1107.
2.4
TENDON FABRICATION
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NOTE: The tendon consists of the prestressing
steel, anchorage, corrosion protection, centralizers
and spacers, and sheathing where required. For
fully bonded anchors, the free stressing length is
SECTION 02490
Page 25
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