less than 12 hours.
3.11.3.3
Installation of Neoprene Bearing Pads and Joint Filler Material
Install neoprene bearing pads in accordance with the details shown on the
contract drawings. Install expansion joint filler material in horizontal
and vertical joints between all precast concrete units in accordance with
the details shown on the contract drawings. Install neoprene bearing pads
accurately to the locations shown. Apply adhesive to neoprene bearing pads
and expansion joint filler material to bond these materials to the concrete
surfaces of the precast units. Allow adhesive to cure for an appropriate
time.
3.11.3.4
Placement of Infill Concrete
After precast units have been erected, plumbed, leveled, and secured with
the temporary unit supports, place infill concrete to fill the void behind
the precast units as shown. Place infill concrete behind the [bottom and
middle] units in lifts of the heights shown on the drawings. Do not place
consecutive lifts in less than the time indicated in the approved erection
plan. Ensure that all formwork at joints and open ends are leak-tight, and
sufficiently rigid to withstand the pressures encountered during the infill
concrete placement. Block elastomeric filler material, neoprene bearing
pads, expansion joint material, back-up material, and shims sufficiently
to prevent movement during placement of infill concrete.
Begin curing of
infill concrete as soon as possible after completion of the placement and
continue until the next lift of precast units is installed. Cure the
exposed infill concrete in accordance with [Section 03301A CAST-IN-PLACE
STRUCTURAL CONCRETE FOR CIVIL WORKS] [Section 03307 CONCRETE FOR MINOR
STRUCTURES].
3.11.4
Shotcrete
Install anchors and reinforcement as shown on the drawings. Place, finish
and cure shotcrete in accordance with the applicable requirements of
Section 03371 SHOTCRETE.
3.12
TESTS AND INSPECTIONS
3.12.1
General
The individuals who sample and test repair materials as required in this
specification shall have demonstrated a knowledge and ability to perform
the necessary test procedures equivalent to the ACI minimum guidelines for
certification of Concrete Field Testing Technicians, Grade I.
3.12.2
Preparations for Placing
Inspect prepared surfaces, forms, and embedded items in sufficient time
prior to each placement of repair material to certify that the surfaces are
ready to receive the repair material.
3.12.3
Grouted Dowels and Anchors
Test the first three dowels or anchors of each type and a minimum of three
dowels or anchors per 1,000 dowels or anchors in accordance with ASTM E 488.
Use incremental loading for tensile test to 75% of the yield strength of
the dowel or anchor. Consider anchors to have failed if displacement
exceeds 2.5 mm (0.1 inch)0.1 inch or if any of the failure modes of
SECTION 03931
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