2010 Construction and Material Specifications - Ohio Department of ...

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520.11
520.11 Inspection and Testing. After curing and before final acceptance,
sound all patched areas. Remove and replace all unsound or cracked areas. In
addition to sounding all patches, the Department will base acceptance of the
pneumatically placed mortar on 4-inch (100 mm) diameter cores taken from
patched areas and tested for compressive strength. The Engineer will determine the
location of the cores, with one core being taken for each 200 square feet (20 m 2 ) of
pneumatically placed mortar. Drill the cores completely through the patched area
and into the underlying sound concrete at least 1/2 inches. Ensure that the depth of
the cores is at least 4 inches. The Engineer will visually inspect the cores at the
site for hollow areas, sand pockets, and voids around reinforcing steel. Test the
cores at an independent laboratory for compressive strength. The required
minimum average compressive strength is 3000 pounds per square inch (21 MPa)
at 7 days, with no single core test less than 2600 pounds per square inch (18 Mpa).
The Engineer will waive coring on small quantities or overhead patches if it is
determined by sounding and visual inspection that the patches are sound.
Remove, replace, re-inspect, and re-test all defective patches, as determined by
sounding, visible cracks, or unacceptable cores.
Fill core holes with concrete as per 519.
520.12 Method of Measurement. The Department will measure
Pneumatically Placed Mortar by the number of square feet (square meters) as
determined under Method A, unless Method B or another method is specified.
A. Method A. The Department will measure the actual area of exposed
surfaces of all completed, tested, and approved patches, irrespective of depth or
thickness of the patch. If a patch includes corners or edges of such members as
beams, columns, or curbs, the Department will include all of the exposed surfaces;
or if a patch extends completely through a member or a slab, the Department will
include both exposed surfaces.
B. Method B. For unreinforced mortar repairs, the Department will measure
the actual area of exposed surfaces of all completed, tested, and approved patches,
irrespective of depth or thickness of patch. If a patch includes corners, or edges of
such members as beams, columns, or curbs, the Department will include all of the
exposed surfaces. For fabric reinforced mortar repairs, the Department will
measure the actual surface area of fabric, complete and in place. The Department
will consider fabric laps and layers of fabric closer than 2 1/2 inches (65 mm),
center-to-center of layer, as a single layer in area measurements. The Contractor
and the Engineer will agree on the measured area of wire fabric before said fabric
is encased in mortar, otherwise the Department will obtain the area of the patch for
pay purposes as described for unreinforced mortar repairs.
The Contractor is responsible for all test panels, coring repair of core holes,
independent laboratory testing of the cores, and replacement of rejected areas and
shall include them under Pneumatically Placed Mortar.
520.13 Basis of Payment. The Department will not pay for additional
reinforcement to replace that damaged by the Contractor’s operations.