Page 197 - Masonry and Concrete
P. 197
Footings, Foundation Walls, Basements, and Slabs
196 CHAPTER SIX
TOP OF WALL
STEEP GROUND
SLOPE
STEPPED FOOTING
TOP OF WALL
MODERATE
GROUND
SLOPE
FOOTING ELEVATION REMAINS LEVEL
FIGURE 6-8
Footings on sloped ground.
concrete with a 6-in. slump will flow easily and seek its own level
in the footing, but the high water-cement ratio reduces it compres-
sive strength. Using a 6-sack mix (6 sacks of cement per cubic yard
1
of concrete) instead of a 5 or 5 2-sack mix will compensate for the
extra water and higher slump and still provide the 2,500 psi com-
pressive strength required by Code. For stepped footings, step the
excavation down and form a dam with a board or piece of plywood
and wooden stakes driven firmly into the sides of the excavation
(Figure 6-11).
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