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Oct. 2968 CONCRETE RESERVOIR DESIGN 1183 <br />of this type using flat -slab roofs have <br />histories of satisfactory service. <br />General Precautions <br />. Some general precautions can re- <br />duce the possibility of truble with wire - <br />wrapped prestressed reservoirs. These <br />include: <br />1. Prohibiting the use of calcium <br />chloride in the concrete mix or in the <br />pneumatically applied mortar <br />2. The use of rubber or asbestos - <br />graphite pads for supporting the roof <br />on the wall <br />8. Use of galvanized wire for the <br />wire -wrap <br />9. Filling the reservoir before the <br />Pneumatically applied mortar is shot <br />on the core -wall and stopping any leaks <br />through the wall that may appear <br />10. Application of two coats of a <br />good quality vinyl paint to the com- <br />plete exterior surfaces of the wall to <br />seal any hair -line cracks. <br />Precast Prestressed Reservoirs <br />Precast prestressed reservoirs built <br />under the Pritzker system have created <br />Fig. 2. Roof Over Riviera Reservoir, Santa Monica, Calif. <br />The roof area over this 25-mil-gab reservoir is used for tennis courts and parking area, <br />3. The use of a bulb -type waterstop <br />between the wall footing and the wall <br />4. Constructing the concrete core - <br />wall in alternate sections and using <br />waterstops in the vertical joints <br />5. Use of a water cure only, for the <br />outside surface of the wall <br />6. Sandblasting the exterior surface <br />of the wall before the wire -wrapping <br />is done <br />7. Application of a cement slurry to <br />the outside of the core -wall as the <br />wire -wrap is placed and again just <br />before the pneumatically applied mor- <br />tar is placed <br />considerable interest in recent years, <br />primarily because the designs offered <br />are esthetically pleasing. Figure 3 il- <br />lustrates this type of reservoir. It con- <br />sists of a series of pretensioned curved <br />panels held together like staves of a <br />barrel by cast -in -place ring girders at <br />the top and bottom. In small reser- <br />voirs, the ring girders may be de- <br />signed as ordinary reinforced concrete <br />members without post -tensioning. In <br />large reservoirs, they may be post - <br />tensioned by using either, embedded <br />tubes and cables or by wire wrapping <br />applied to the outside faces of the ring <br />RICHARD BRADY & ASSOCIATES, INC. F-52 <br />