Description
New developments in materials technology and the addition of field experience to the engineering knowledge base have expanded the applications of fiber-reinforced concrete (FRC). Fibers are made with different materials and can provide different levels of tensile/flexural capacity for a concrete section, depending on the type, dosage, and geometry. This guide provides practicing engineers with simple, yet appropriate, design guidelines for FRC in structural and nonstructural applications. Standard tests are used for characterizing the performance of FRC and the results are used for design purposes, including flexure, shear, and crack-width control. Specific applications of fiber reinforcement have been discussed in this document, including slabs-on-ground, composite slabs-on-metal decks, pile-supported ground slabs, precast units, shotcrete, and hybrid reinforcement (reinforcing bar plus fibers).
Keywords: crack control; fiber-reinforced concrete; flexural toughness; macrofiber; moment capacity; precast; residual strength; shear capacity; shotcrete; slabs-on-ground; steel fibers; synthetic fibers; tensile strength; toughness.
Table of Contents
CHAPTER 1—INTRODUCTION AND SCOPE
1.1—Introduction
1.2—Scope
1.3—Historical aspects
CHAPTER 2—NOTATION AND DEFINITIONS
2.1—Notation
2.2—Definitions
CHAPTER 3—CHARACTERISTICS OF FRC
3.1—Classification of fibers
3.2—Performance of FRC
3.3—Standard test methods for FRC
3.4—Strain softening and strain hardening
CHAPTER 4—DESIGN CONCEPTS AND GUIDES
4.1—Design concepts
4.2—Tensile stress-strain response for FRC
4.3—Correlation of tensile and flexural response for FRC
4.4—Design of RC for flexure (stress block)
4.5—Design of FRC for flexure (ASTM C1609/C1609M, in conjunction with RILEM TC 162-TDF [2003])
4.6—Design of FRC for flexure (Model Code 2010 [fib 2013])
4.7—Design of FRC for flexure-hybrid reinforcement
4.8—Design of FRC for shear
4.9—Parametric-based design for FRC
CHAPTER 5—DESIGN FOR SPECIFIC APPLICATIONS
5.1—Slabs-on-ground
5.2—Extended joint spacing
5.3—Elevated floors/slabs-on-piles
5.4—Composite steel decks
5.5—Precast units
5.6—Shotcrete
5.7—Crack control and durability
CHAPTER 6—CONSTRUCTION PRACTICES
6.1—Mixture design recommendations for FRC
6.2—Workability of FRC
6.3—Adding and mixing fibers
6.4—Placing, consolidation, and finishing FRC
6.5—Quality control for FRC
6.6—Contraction (control) joints
6.7—Specifying FRC
CHAPTER 7—REFERENCES
Authored references
APPENDIX—SOLVED EXAMPLE PROBLEMS FOR SECTION 4.9—PARAMETRIC BASED DESIGN FOR FRC
Case A: Calculation of the moment capacity of a given section
Case B: Calculation of μ based on parametric-based design for FRC (ACI 544.8R)
Case C: Calculation of μ for the replacement of reinforcement in a singly reinforced slab (ACI 544.8R)