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Foundation
base to be on undisturbed soil.
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Foundation
excavation must be free of water before placement of concrete.
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During
placement of concrete, maximum free fall distance shall not exceed
four feet (120 cm).
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All
concrete placed during freezing temperatures shall be pre-heated
and properly protected during curing. All handling and
placement to be in accordance with good construction practice.
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Minimum
28 day compressive strength: 3,000 psi.
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Air
entrained concrete: 6% + 1.
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Slump
range of concrete during placement: 1.5 to 4.5 inches (3.7
to 11.2 cm).
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Backfill
material shall be free from debris of any kind, including ice,
snow or frozen material.
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This dimension is the
minimum value used with the 74 ft antenna, for the 112 ft antenna
the minimum dimension would be 8 ft.
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where the soil
condition warrant, then sulphur resistance concrete should be
used.
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Recommend the use of
plywood as a template for 8 anchor-bolts before placement of
concrete.
