1.0 to 1.5 m 3 to 5 feet wide and 0.7 m 2 feet longer than the pavement
width shall be carefully pulled across the surface]. Edges and joints
shall be rounded with an edger having a radius of 3 mm 1/8 inch. Curing
shall be as specified.
3.14.2
Sidewalks
Concrete shall be 100 mm 4 inches minimum thickness. Contraction joints
shall be provided at 1.75 m 5 feet spaces unless otherwise indicated.
Contraction joints shall be cut 25 mm 1 inch deep with a jointing tool
after the surface has been finished. Transverse expansion joints 12 mm 1/2
inch thick shall be provided at changes in direction and where sidewalk
abuts curbs, steps, rigid pavement, or other similar structures. Sidewalks
shall be given a lightly broomed finish. A transverse slope of 1 mm per 50
mm 1/4 inch per foot shall be provided, unless otherwise indicated.
Variations in cross section shall be limited to 1 mm per 250 mm 1/4 inch in
5 feet.
3.14.3
Curbs and Gutters
Concrete shall be formed, placed, and finished by hand using a properly
shaped "mule" or constructed using a slipform machine specially designed
for this work. Contraction joints shall be cut 75 mm 3 inches deep with a
jointing tool after the surface has been finished. Expansion joints (12 mm
1/2 inch wide) shall be provided at 35 m 100 feet maximum spacing unless
otherwise indicated. Exposed surfaces shall be finished using a stiff
bristled brush.
3.14.4
Pits and Trenches
Pits and trenches shall be constructed as indicated on the drawings.
Bottoms and walls shall be placed monolithically or waterstops and keys,
shall be provided as approved.
3.15
CURING AND PROTECTION
3.15.1
General
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NOTE: Do not allow membrane curing compound on
surfaces where appearance is critical or that are
maintained at curing temperature with free steam.
Moist curing should almost always be permitted.
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Concrete shall be cured by an approved method for the period of time given
below:
Concrete with Type III cement
3 days
All other concrete
7 days
Immediately after placement, concrete shall be protected from premature
drying, extremes in temperatures, rapid temperature change, mechanical
injury and damage from rain and flowing water for the duration of the
curing period. Air and forms in contact with concrete shall be maintained
at a temperature above 10 degrees C 50 degrees F for the first 3 days and
at a temperature above 0 degrees C 32 degrees F for the remainder of the
specified curing period. Exhaust fumes from combustion heating units shall
be vented to the outside of the enclosure, and heaters and ducts shall be
SECTION 03300A
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