Masonry Magazine May 1967 Page. 33
Fig. 3 REINFORCED CONCRETE MASONRY WALLS WITH FOOTING AND FLOOR DETAILS
12-in, nominal units
Four %" bars continuous
Continuous bond beam courses 16" on center, each with two ½" bars.
See Fig. 5 for bond-beam construction
B-Bars
A-Bars
Final Grade
Footing bars project a minimum of thirty bar diameters into block cores.
Original Ground
16
T/2
C-Bars
2-0-
Two coats of portland cement plaster, each ¼" minimum thickness.
Thicken second layer to form a cove at floor.
Separate poured footing of reinforced concrete
Full mortar bedding
Same size and spacing as A-Bars
Fill joint with mastic
Cut cleanout openings in block before laying, Inspect steel, clean out mortar droppings, and form over before grouting
REINFORCED CONCRETE FLOOR SLAB
4" min
Gravel or crushed stone layer 4-in, to 6-in, thick under floor, and under footing if subgrade is impermeable.
Floor reinforcing: %-in, bars on 12-in, centers or 6 x 6-4/4 mesh (No. 4 AS & W gage wires on 6-in, centers)
30° max
4-in, minimum diameter drain tile. Cover with gravel before back-filling. Extend around perimeter of pool with one or more cross lines and connect to storm sewer or dry well.
%" bars at 12 in, on center
T/2
REINFORCEMENT SCHEDULE
A Bars
B Bars
C Bars
Spac-
Spac-
Spac
H
T
X
Dia.
ing Dia. ing
Dia,
ing
3-4" 12"
1-0"
%"
32"
%"
32"
%"
32"
4′-0" 12"
1-0"
3/4" 32"
%"
32"
%" 32"
4′-8" 12" 1-4"
%"
32"
32"
%"
32"
5-4" 12" 2-0"
%"
32"
%"
32"
%"
32"
6-0" 16" 2-6"
%"
16"
32"
%"
16"
6-8 16 3-0" 34"
16"
%"
16"
%"
16"
7-4" 16" 3'-8"
34"
16"
%"
16"
%"
16"
8-0" 16" 4-6"
34"
8"
%"
16"
16"
NOTES
1. Reinforcement of size and spacing other than that indicated may be used provided that an equal area of steel is furnished.
2. Alternate vertical bars may be terminated at the mid-height (H/2) if the spacing of the remaining bars extending to the top of the wall does not exceed 36 inches.
3. Increase horizontal reinforcement 255% to 50% in areas of severe cold weather. Reductions are possible in mild climates if pool is kept filled except for short periods.
4. Fill all cavities with 2500 psi concrete or grout.
5. Tie all reinforcing steel at intervals not exceeding 160 bar diameters.
of the liner type, and the percentage is increasing rapidly.
WATERPROOFING
The final finish of the pool is one of the most important considerations to the owner. The finish-in addition to being attractive and waterproof-should be durable, hard, easily cleaned, and resistant to the alkali in the block and the chemicals in the water. The finish should be light in color for safe visibility and for easy detection of dirt accumulations.
The vinyl or nylon liner mentioned previously is one solution. This liner eliminates the need for any surface treatment with the possible exception of a fill coat used on coarse-textured block to protect the liner from damage. Investigate to determine local availability and satisfactory experience with other paints and coatings. The general choice of finishes are: painted or un-painted portland cement plaster; tile; paint; and plastic, epoxy, or other synthetic coatings. Coatings differ from paints in that they form a film by chemical reaction or catalytic change. A coating specifically designed for swimming pools probably will fulfill its service requirements excellently. However, these coatings are expensive and usually must be applied by specialists. Besides requiring unique equipment for application, they possess critical temperature and other restrictions.
Paints are less expensive, but repainting is required at one-to-three-year intervals. Again, the manufacturer's recommendations should be followed closely. Be sure that the paint selected is one which affords easy repaintability by the same or another type of paint. Repaintability of portland cement paint or chlorinated rubber paint, both widely used for swimming pools, is considered poor by some authorities.
Frost proof or glazed tile may be used around the waterline or for decorative effect, but is generally too expensive to be used for the complete liner. Portland cement plaster is a good liner, but requires careful application in two 14-inch layers, with each layer moist-cured for 24 to 48 hours.
WATER SUPPLY AND SANITATION
Small private pools may employ the "fill-and-draw" or the "flow-through" method of water supply, or may use continuous recirculation through a filter. Larger pools and all public pools use the latter system after initial filling. Municipal water systems will not yield clear pool water without additional filtration-and a cloudy appearance is unattractive and a safety hazard. Continuous recirculation and filtration is