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Title: Section 1923  •  Size: 5839

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1923.1 General.

1923.1.1 Scope. This section provides minimum requirements for design and construction of plain concrete for both cast-in-place and precast members.

EXCEPTION: The design is not required when the minimum foundation for stud walls is in accordance with Table 18-I-D.

1923.1.2 Limitations. Use of plain concrete shall be limited to (1) members that are continuously supported by soil or supported by other structural members capable of providing continuous vertical support; (2) members for which arch action provides compression under all conditions of loading; or (3) cast-in-place concrete piles or piers, except in Seismic Zones 2, 3 and 4, that have adequate lateral support for stability and where calculated compression occurs on the entire cross section under all conditions of loading.

The design requirements of Section 1923 are not intended to apply to nonstructural members of plain concrete, such as soil-supported slabs, unless such slabs transmit vertical loads from other parts of the structure to the soil.

Plain concrete for compression members, other than arches, walls, and cast-in-place piles and piers permitted in the first paragraph of this subsection, shall be limited to pedestals in accordance with Section 1923.9.4.

Plain concrete shall not be used in Seismic Zones 2, 3 or 4, except where specifically permitted by Section 1923.10.3.

1923.2 Definitions. For the purpose of this section, certain terms are defined as follows:

CONTROL JOINT is a construction joint or partial joint (minimum 25 percent reduction of member thickness) used for the purpose of reducing buildup of internal stresses caused by restraint to movements due to creep, shrinkage or temperature effects.

PLAIN CONCRETE is concrete that is either unreinforced or contains less reinforcement than the minimum amount specified in this code for reinforced concrete.

1923.3 Materials. Specification for testing and materials shall be in accordance with Section 1903. Plain concrete, other than fill, shall have a specified compressive strength, , of not less than 2,500 psi (17.24 MPa).

1923.4 Joints. Unless reinforcement is used to control temperature and shrinkage stresses, plain concrete construction shall be provided with control joints to divide members into flexurally discontinuous elements. When control joints are used, the size of each element shall be limited to control buildup of excessive internal stresses within each element caused by restraint to movement from creep, shrinkage and temperature effects.

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