]3.8.3
Concrete Walks
Provide 100 mm (4 inches) 4 inches thick minimum. Provide contraction
joints spaced every 1500 lineal mm (5 linear feet) 5 linear feet unless
otherwise indicated. Cut contraction joints 25 mm (one inch) one inch deep
with a jointing tool after the surface has been finished. Provide 13 mm
(0.5 inch) 0.5 inch thick transverse expansion joints at changes in
direction where sidewalk abuts curb, steps, rigid pavement, or other
similar structures; space expansion joints every 15 m (50 feet) 50 feet
maximum. Give walks a broomed finish. Unless indicated otherwise, provide
a transverse slope of 1/48. Limit variation in cross section to 6 mm in
1500 mm (1/4 inch in 5 feet) 1/4 inch in 5 feet.
3.8.4
Pits and Trenches
Place bottoms and walls monolithically or provide waterstops and keys.
3.8.5
Curbs [and Gutters]
Provide contraction joints spaced every 3 m (10 feet) 10 feet maximum
unless otherwise indicated. Cut contraction joints 20 mm (3/4 inch) 3/4
inch deep with a jointing tool after the surface has been finished.
Provide expansion joints 13 mm (1/2 inch) 1/2 inch thick and spaced every
30 mm (100 feet) 100 feet maximum unless otherwise indicated. Perform
pavement finish.
[3.8.6
Splash Blocks
Provide at outlets of downspouts emptying at grade. Splash blocks may be
precast concrete, and shall be 600 mm long, 300 mm wide, and 100 mm thick
(24 inches long, 12 inches wide, and 4 inches thick) 24 inches long, 12
inches wide, and 4 inches thick, unless otherwise indicated, with
smooth-finished countersunk dishes sloped to drain away from the building.
]3.9
CURING AND PROTECTION
**************************************************************************
NOTE: When the use of alkali-reactive aggregates is
permitted, delete everything after the first two
sentences, add the following, and add paragraph
entitled "Additional Curing When Using
Alkali-Reactive Aggregates" as follows:
"Alkali-reactive aggregates may be used where not
exposed to either seawater or alkali soil
conditions, and when used with one of the following
cements and tested in accordance with ASTM C 441 to
ensure that a 75 percent minimum reduction of
expansion due to alkali-aggregate reaction is
provided.
1. ASTM C 150 low alkali cement (Table 1A, maximum
of 0.60 percent equivalent Na2O).
2. ASTM C 59/C 59M5M ASTM C 59/C 59M5 blended
cement.
3. ASTM C 150 low alkali, Type I or II cement with
fly ash, pozzolan, or ground slag.
SECTION 03300N
Page 42
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