Table 3 - Air Content
Nominal maximum size of
Size
Total air content,
coarse aggregate, mm
Number
percent by volume
75.0
-
1.5-4.5
Table 3 - Air Content
Nominal maximum size of
Size
Total air content,
coarse aggregate, inch(es)
Number
percent by volume
3/8
8
6-10
1/2
7
5-9
3/4
67
4-8
1
57
3.5-6.5
1 1/2
467
3-6
2
357
2.5-5.5
3
-
1.5-4.5
]2.2.5.2
Accelerating
ASTM C 494, Type C.
2.2.5.3
Retarding
ASTM C 494, Type B, D, or G.
2.2.5.4
Water Reducing
ASTM C 494, Type A, E, or F.
2.2.5.5
High Range Water Reducer (HRWR)
ASTM C 494, Type F and ASTM C 1017.
2.2.6
Materials for Forms
Provide wood, plywood, or steel. Use plywood or steel forms where a smooth
form finish is required. Lumber shall be square edged or tongue-and-groove
boards, free of raised grain, knotholes, or other surface defects.
Plywood: PS-1, B-B concrete form panels or better. Steel form surfaces
shall not contain irregularities, dents, or sags.
2.2.6.1
Form Ties and Form-Facing Material
a.
Provide a form tie system that does not leave mild steel after
break-off or removal any closer than 50 mm 2 inches from the
exposed surface. Do not use wire alone. Form ties and
accessories shall not reduce the effective cover of the
reinforcement.
b.
Form-facing material shall be structural plywood or other material
that can absorb air trapped in pockets between the form and the
concrete and some of the high water-cementitious materials ratio
surface paste. Maximum use is three times. Provide forms with a
form treatment to prevent bond of the concrete to the form.
SECTION 03311
Page 25
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