140_151SubgradeFrmwrk
10/21/04
11:26 PM
Page 142
Subgrade, Formwork
and Cast-in-place
S
haw & Sons pays careful attention to the
engineering details of formwork, including
horizontal and vertical layout, fabrication
and installation to insure a visually smooth,
code compliant finished concrete slab.
Without a well-graded and compacted subgrade,
even the best architectural concrete may fail.
Subgrade should consist of semi-permeable, nonexpansive soils and materials, and must be graded
and compacted in accordance with the soils report.
Architectural concrete should always be placed over
a minimum of two-inch dry, compacted and screeded, washed concrete sand. Sand allows the concrete
to “bleed” or hydrate evenly on the surface, thus minimizing the potential of irregular coloration on the
surface of finished concrete.
142
Queensway Bay, Long Beach, subterranean pump
room construction.
Queensway Bay hardscape, Long Beach. Reinforcing steel prior to Speed
DowelTM installation and dobe placement. Typical rebar schedule - # 4 rebar at 18
inches o.c.e.w. on compacted subgrade.
Detail of our patented
Speed Dowel system
(Also See Pages 149,152 and 153).