shall be responsible for drilling the cores, measuring the cores, and for
filling the core holes with a non-shrink concrete, as approved.
1.5.9.1
Drilling, Measuring, and Computations
Two cores, between 100 and 150 mm 4 and 6 inches in diameter, shall be
drilled from the pavement, per sublot (8 per lot). Eight measurements of
thickness shall be made around the circumference of each core and one in
the center, in accordance with ASTM C 174/C 174M, using calibrated calipers
for specimens longer than 250 mm 10 inches. The pavement thickness from
the 8 cores for the lot shall be averaged and shall be evaluated as
described below.
1.5.9.2
Evaluation and Payment Adjustment for Thickness
Using the Average Thickness of the lot, the computed percent payment for
thickness shall be determined by entering the following table:
Computed Percent Payment for Thickness
Deficiency in Thickness
Determined by Cores
Pavements Over
Pavements Less than
millimeters
200 mm Thick
200 mm Thick
0.00 to 6.0
100
100
6.5 to 12.5
75
65
13.0 to 18.5
50
0
19.0 or greater
0
-
Computed Percent Payment for Thickness
Deficiency in Thickness
Determined by Cores
Pavements Over
Pavements Less than
Inches
8 Inches Thick
8 Inches Thick
0.00
to
0.24
100
100
0.25
to
0.49
75
65
0.50
to
0.74
50
0
0.75
or
greater
0
-
Where 0 percent payment is indicated, the entire lot shall be removed and
replaced at no additional cost to the Government. Where either of the two
cores from a sublot show a thickness deficiency of 19 mm 0.75 inch or
greater, two more cores shall be drilled in the sublot and the average
thickness of the four cores computed. If this average shows a thickness
deficiency of 19 mm 0.75 inch or more [13 mm 0.50 inch for pavements 200 mm
8 inches or less in thickness] the entire sublot shall be removed.
1.5.10
Areas Defective in Plan Grade or Smoothness
In areas not meeting the specified limits for surface smoothness and plan
grade, high areas shall be reduced to attain the required smoothness and
grade, except as depth is limited below. High areas shall be reduced by
grinding the hardened concrete with an approved diamond grinding machine
after the concrete is 14 days or more old. The area corrected by grinding
the surface of the hardened concrete shall not exceed 5 percent of the area
of any integral slab, and shall not exceed 1 percent of the total area of
any sublot. The depth of diamond grinding shall not exceed 6 mm 1/4 inch.
All pavement areas requiring plan grade or surface smoothness corrections
SECTION 02753
Page 20
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