scope:

Except for primary containment of hazardous materials, this Code, where adopted under the requirements of the legally adopted building code, provides minimum requirements for the design and construction of reinforced concrete elements of environmental engineering concrete structures. In areas without a legally adopted building code, this Code defines minimum acceptable standards for materials, design, and construction practice. This Code also covers the strength evaluation and condition assessment of environmental engineering concrete structures.

In this Code, the term "concrete" shall also include shotcrete except where specifically indicated otherwise.

The specified concrete compressive strength shall not be less than 4000 psi. No maximum specified compressive strength shall apply unless restricted by a specific Code provision.

Environmental engineering concrete structures are defined as concrete structures intended for conveying, storing, or treating water, wastewater, or other liquids and non-hazardous materials such as solid waste, and for secondary containment of hazardous liquids. For ancillary structures for which liquid-tightness, gas-tightness, or enhanced durability are essential, design considerations shall also conform to requirements of environmental engineering concrete structures.

Precast concrete environmental structures designed and constructed in accordance with ASTM standards are not covered in this Code.

This Code supplements the general building code and shall govern in all matters pertaining to design and construction of reinforced concrete elements of environmental engineering concrete structures, except wherever this Code is in conflict with requirements in legally adopted codes addressing environmental engineering concrete structures.

This Code shall apply in all matters pertaining to design, construction, and material properties wherever this Code is in conflict with requirements contained in other standards referenced in this Code.

The provisions of this Code shall govern for tanks, reservoirs, and other reinforced concrete elements of environmental engineering concrete structures. For special structures such as arches, bins and silos, blast-resistant structures, and chimneys, provisions of this Code shall govern where applicable. When an environmental concrete structure may be considered a building structure then it shall be designed to the requirements of this Code.

This Code does not govern design and installation of portions of concrete piles, drilled piers, and caissons embedded in ground except for structures in regions of high seismic risk or assigned to high seismic performance or design categories. Refer to 21.10.4 for requirements for concrete piles, drilled piers, and caissons in regions of high seismic risk or assigned to high seismic performance or design categories.

This Code governs the design and construction of both structural and non-structural slabs-on-ground for environmental engineering concrete structures.

Concrete on steel deck

Design and construction of structural concrete slabs cast on stay-in-place, non-composite steel form deck are governed by this Code.

This Code does not govern the design of stay-inplace, composite steel form deck. However, the concrete design and construction shall be governed by this Code, where applicable.

Provisions for earthquake resistance

The Seismic Design Category of a structure shall be determined in accordance with the legally adopted building code, or determined by other authority having jurisdiction in areas without a legally adopted building code.

Applicable provisions based on Seismic Design Category are defined in Chapter 13 for structures not otherwise exempted by the legally adopted general building code.

For prestressed concrete environmental structures, Chapters 1 through 22 cover prestressing in general.