ACI 371R-16 Guide for the Analysis, Design, and Construction of Elevated Concrete and Composite Steel- Concrete Water Storage Tanks.
1.2—Scope Recommendations supplement the general requirements for reinforced concrete and prestressed concrete design and construction given in ACI 318, ACI 301, ACI 350, and ACI 350.5. Design and construction recommendations include materials, determination of structural loads, design of concrete elements including foundations, design of concrete or steel tank components, construction requirements, geotechnical requirements, appurtenances, and accessories. Materials, design, fabrication, and construction of the steel vessel of composite steel-concrete tanks are addressed by applicable sections of AWWA D100. Design and construction recommendations are presented for the types of elevated concrete and composite steel- concrete water storage tanks shown in Fig. 1.2a and 1.2b. The elevated concrete tank consists of a post-tensioned concrete vessel on a cast-in-place concrete pedestal. The composite steel-concrete tank consists of a steel vessel on a cast-in-place concrete pedestal. This guide may be used in whole or part for other tank confgurations; however, the designer should determine the suitability of such use for other confgurations and details.
3.1—Materials common to both composite and concrete tank types 3.1.1 General—Concrete that is not in contact with stored water should meet the requirements of ACI 318 except as indicated in 3.1.2 through 3.1.4. 3.1.2 Compressive strength—The minimum specifed compressive strength of concrete should be: (a) Pedestal: 4000 psi (28 MPa) (b) Foundations and intermediate foors: 3500 psi (24 MPa) (c) Slabs-on-ground (Table 3.1.2) 3.1.3 Admixtures—Admixtures may be used to achieve the required properties of concrete, provided that the correct type and proper dosage are used. Admixtures should be compatible such that their combined effects produce the required results in hardened concrete, as well as during placement and curing. Chemical admixtures––Chemical admixtures should meet the requirements of ASTM C494/C494M and be used in accordance with ACI 350.5. Air-entraining admixtures should comply with ASTM C260/C260M. High-range water-reducing admixtures conforming to ASTM C494/C494M Type F or G can be used to facilitate the placement of concrete. Shrinkage- reducing admixtures can be used to reduce the effects of drying shrinkage in concrete. These admixtures should meet the requirements of ASTM C494/C494M Type S.ACI 371R pdf download.