Even with the best slab designs and proper construction, however, it is unrealistic to expect crack-free and curl-free floors. Consequently, every owner should be advised by both the designer and contractor that it is normal to expect some amount of cracking and curling on every project, and that such occurrence does not necessarily reflect adversely on either the adequacy of the floor’s design or the quality of its construction. Design examples appear in an appendix.

• Introduction, p. 360R-3
  • Purpose and scope
  • Work of Committee 360 and other relevant committees
  • Work of non-ACI organizations
  • Design theories for slabs-on-ground
  • Overview of subsequent chapters
  • Further research
• Slab types, p. 360R-5
  • Introduction
  • Slab types
  • General comparison of slab types
  • Design and construction variables
  • Conclusion
• Support systems for slabs-on-ground, p. 360R-7
  • Introduction
  • Geotechnical engineering reports
  • Subgrade classification
  • Modulus of subgrade reaction
  • Design of slab-support system
  • Site preparation
  • Inspection and site testing of slab support
  • Special slab-on-ground support problems
• Loads, p. 360R-17
  • Introduction
  • Vehicular loads
  • Concentrated loads
  • Distributed loads
  • Line and strip loads
  • Unusual loads
  • Construction loads
  • Environmental factors
  • Factors of safety
• Joints, p. 360R-21
  • Introduction
  • Load-transfer mechanisms
  • Sawcut contraction joints
  • Joint protection
  • Joint filling and sealing
• Design of unreinforced concrete slabs, p. 360R-29
  • Introduction
  • Thickness design methods
  • Shear transfer at joints
  • Maximum joint spacing
• Design of slabs reinforced for crackwidth control, p. 360R-32
  • Introduction
  • Thickness design methods
  • Reinforcement for crack-width control only
  • Reinforcement for moment capacity
  • Reinforcement location
• Design of shrinkage-compensating concrete slabs, p. 360R-32
  • Introduction
  • Thickness determination
  • Reinforcement
  • Other considerations
• Design of post-tensioned slabs-onground, p. 360R-36
  • Notation
  • Definitions
  • Introduction
  • Applicable design procedures
  • Slabs post-tensioned for crack control
  • Industrial slabs with post-tensioned reinforcement for structural support
  • Residential slabs with post-tensioned reinforcement for structural action
  • Design for slabs on expansive soils
  • Design for slabs on compressible soil
• Fiber-reinforced concrete slabs-onground, p. 360R-45
  • Introduction
  • Polymeric fiber reinforcement
  • Steel fiber reinforcement
• Structural slabs-on-ground supporting building code loads, p. 360R-48
  • Introduction
  • Design considerations
• Design of slabs for refrigerated facilities, p. 360R-49
  • Introduction
  • Design and specification considerations
  • Temperature drawdown
• Reducing effects of slab shrinkage and curling, p. 360R-50
  • Introduction
  • Drying and thermal shrinkage
  • Curling and warping
  • Factors that affect shrinkage and curling
  • Compressive strength and shrinkage
  • Compressive strength and abrasion resistance
  • Removing restraints to shrinkage
  • Base and vapor retarders/barriers
  • Distributed reinforcement to reduce curling and number of joints
  • Thickened edges to reduce curling
  • Relation between curing and curling
  • Warping stresses in relation to joint spacing
  • Warping stresses and deformation
  • Effect of eliminating sawcut contraction joints with post-tensioning or shrinkage-compensating concrete
  • Summary and conclusions
• References, p. 360R-57
  • Referenced standards and reports
  • Cited references
• APPENDIX
  • Appendix 1-Design examples using PCA method, p. 360R-61
    • A1.1-Introduction
    • A1.2-PCA thickness design for single-axle load
    • A1.3-PCA thickness design for slab with post loading
    • A1.4-Other PCA design information
  • Appendix 2-Slab thickness design by WRI method, p. 360R-63
    • A2.1-Introduction
    • A2.2-WRI thickness selection for single-axle wheel load
    • A2.3-WRI thickness selection for aisle moment due to uniform loading
  • Appendix 3-Design examples using COE charts,p. 360R-64
    • A3.1-Introduction
    • A3.2-Vehicle wheel loading
    • A3.3-Heavy forklift loading
  • Appendix 4-Slab design using post-tensioning,p. 360R-67
    • A4.1-Design example: Residential slabs on expansive soil
    • A4.2-Design example: Using post-tensioning to minimize cracking
    • A4.3-Design example: Equivalent tensile stress design
  • Appendix 5-Examples using shrinkage compensating concrete, p. 360R-72
    • A5.1-Introduction
    • A5.2-Example with amount of steel and slab joint spacing predetermined
  • Appendix 6-Design examples for steel FRC slabs-on-ground using yield line method, p. 360R-72
    • A6.1-Introduction
    • A6.2-Assumptions/design criteria
    • Conversion factors, p. 360R-74