above deviations from the approved grade line and elevation will not be
permitted in areas where closer conformance with the planned grade and
elevation is required for the proper functioning of appurtenant structures.
The finished surfaces of new abutting pavements shall coincide at their
juncture.
1.5.8
Flexural Strength
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NOTE: Normally, concrete for airfield pavement
should be proportioned and accepted on the basis of
90-day flexural strength. However, if, because of
scheduling time limits, it is necessary to
proportion on the basis of 28-day flexural strength,
modify these subparagraphs as appropriate. If it is
desired to use 28-day strength for design of
airfield pavement, approval must be obtained through
the TSMCX, AFCESA, Navy EFD or NFESC. Make the same
changes if this is concrete for road pavement
proportioned for 28-day strength (no approval
needed).
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Each lot of pavement will be evaluated for acceptance in accordance with
the following procedures.
1.5.8.1
Sampling and Testing
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NOTE: The designer may choose the first Option
"Cylinders/Beam" or the second Option "Beams" for
strength testing.
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For acceptance, one composite sample of concrete from each sublot shall be
obtained in accordance with ASTM C 172 from one batch or truckload. Test
cylinders 152 x 305 mm 6 x 12 inches shall be fabricated and cured in
accordance with ASTM C 31/C 31M, and tested in accordance with ASTM C 39/C
39M. Two test cylinders per sublot (8 per lot) shall be tested at 14 days.
For acceptance, one composite sample of concrete from each sublot shall be
obtained in accordance with ASTM C 172 from one batch or truckload. Test
beams 152 x 152 mm 6 x 6 inches shall be fabricated and cured in accordance
with ASTM C 31/C 31M; and tested in accordance with ASTM C 78. Two test
beams per sublot (8 per lot) shall be tested at 14 days.
1.5.8.2
Average the eight 14-day strength tests for the lot. The average strength
shall be used in accordance with paragraph "Concrete Strength for Final
Acceptance".
1.5.9
Thickness
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NOTE: Edit for pavement thickness.
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Each lot of pavement will be evaluated for acceptance and payment
adjustment in accordance with the following procedure. The Contractor
SECTION 02753
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