scope:

Purpose and scope

Consistent with the mission of ACI Committee 360, this report presents state-of-the-art information on the design of slabs on grade. In this context, design is defined as the decision-making process of planning, sizing, detailing, and developing specifications generally preceding construction. Information on other aspects, such as materials, construction methods, placement of concrete, and finishing techniques, is included only where it is needed in making design decisions.

In the context of this report, Committee 360 defines slab on grade as:

a slab, continuously supported by ground, whose total loading when uniformly distributed would impart a pressure to the grade or soil that is less than 50 percent of the allowable bearing capacity thereof. The slab may be of uniform or variable thickness, and it may include stiffening elements such as ribs or beams. The slab may be plain, reinforced, or prestressed concrete. The reinforcement or prestressing steel may be provided for the effects of shrinkage and temperature or for structural loading.

This report covers the design of slabs on grade for loads caused by material stored directly on the slab or on storage racks, as well as static and dynamic loads associated with handling equipment and vehicles. Other loads, such as loads on the roof transferred through dual purpose rack systems are also covered. ACI Committee 360 considers use of the information presented in this report reasonable for slabs on grade which support structural loads provided the loading limit of the above definition is satisfied.

In addition to design of the slab for these loadings, the report discusses subgrade-subbase, shrinkage and temperature effects, cracking, curling or warping, and other items affecting the design. Although the same general principles are applicable, the report does not specifically address the design of highways, airport pavements, parking lots, and mat foundations.