Bond length encapsulation shall consist of corrugated polyethylene tubing,
minimum wall thickness 1.5 mm 0.060 inch or corrugated PVC tubing, minimum
wall thickness 1.0 mm 0.040 inch.
2.5
TESTS, INSPECTIONS, AND VERIFICATIONS
The Contractor shall have required material tests performed on prestressing
steel and accessories by an approved laboratory to demonstrate that the
materials are in conformance with the specifications. Grout shall be
tested in accordance with ASTM C 109/C 109M. These tests shall be at the
Contractor's expense. Prestressing steel test results shall be furnished
prior to beginning fabrication of any anchors. Grout test results shall be
provided to the Contracting Officer within 24 hours of testing.
PART 3
EXECUTION
3.1
EQUIPMENT
The Contractor's Quality Control manager shall verify that the equipment
used on site is the same as the equipment submitted for approval.
3.1.1
Drilling Equipment
Drilling equipment shall be suitable for advancing the drill tools to the
depths and at the alignment [specified][required].
3.1.2
Grouting Equipment
3.1.2.1
Grout Mixer
The grout mixer shall be a high-speed, high-shear, colloidal type grout
mixer capable of continuous mechanical mixing that will produce uniform and
thoroughly mixed grout which is free of lumps and undispersed cement. The
mixer shall be equipped with a suitable water [and admixture] measuring
device[s] calibrated to read in cubic centimeters cubic feet and tenths and
so designed that after each delivery the hands can be conveniently set back
to zero.
3.1.2.2
Grout Pump
The grout pump shall be of the positive displacement type, and shall be
capable of pumping at all flow rates below [75] [_____] L/minute [20]
[_____] gpm, shall be capable of pumping at the pressure of at least 345
[_____] kPa [50] [_____] psi at zero flow rate. For neat cement grout, the
pump shall have a screen with [3] [_____] mm [0.125] [_____] inch maximum
clearance to sieve the grout before being introduced into the pump.
Screens are not required for shear type mixers. A pump shall also be
available which is capable of pumping both neat cement grout mixes and
sanded grout mixes. The pumping equipment shall have a pressure gage
capable of measuring pressures of at least 1.0 MPa 150 psi or twice the
required grout pressure, whichever is greater.
3.1.3
Stressing Equipment
Stressing equipment shall be hydraulically operated and shall have a
capacity sufficient to stress the anchors to the [specified][required] Test
Loads within the rated capacity in one stroke. Pumps shall be capable of
applying each load increment in less than 60 seconds and shall be capable
of maintaining the hydraulic pressure within 345 kPa 50 psi. The equipment
SECTION 02490
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