1 General Provisions
1.0.1 This specification is prepared with a view to standardizing the application of fiber reinforced concrete in construction engineering, ensuring engineering quality, and achieving advanced technology, safety and reliability and cost-effectiveness.
1.0.2 This specification is applicable to the mix design, construction, and quality inspection and acceptance of steel fiber reinforced concrete and synthetic fiber reinforced concrete.
1.0.3 In addition to this specification, the application of fiber reinforced concrete also shall comply with those specified in the current relevant standards of the nation.
2 Terminologies
2.0.1 Steel fiber
The fiber made of thin steel wire by cutting off, thin steel sheet by cutting, steel ingot by milling or molten steel by extracting, etc.
2.0.2 Fiber reinforced concrete
The generic term of concrete mixed with short steel fiber or short synthetic fiber.
2.0.3 Steel fiber reinforced concrete
The concrete mixed with short steel fiber as reinforcing material.
2.0.4 Equivalent diameter
The diameter of a circular section which is converted according to the equal sectional area principle when the fiber section is noncircular.
2.0.5 Aspect ratio of fiber
The ratio of length to diameter (or equivalent diameter) of fiber.
2.0.6 Synthetic fiber
The fiber made of organic synthetic material via such technologies as extrusion, extension and modification.
2.0.7 Fibrillated fiber
The synthetic fiber which can form a net after being unfolded.
2.0.8 Synthetic fiber reinforced concrete
The concrete mixed with short synthetic fiber as reinforcing material.
2.0.9 Fiber content
The mass of fiber in every 1m3 of fiber reinforced concrete.
2.0.10 Fraction of fiber by volume
The percentage of the volume of fiber in the volume of concrete.
3 Raw Materials
1 General Provisions
2 Terminologies
3 Raw Materials
3.1 Steel Fiber
3.2 Synthetic Fiber
3.3 Other Materials
4 Technical Properties of Fiber Reinforced Concrete
4.1 Mixture Properties
4.2 Mechanical Properties
4.3 Long-term Properties and Durable Properties
5 Mix Design
5.1 General Requirements
5.2 Determination of Design Strength
5.3 Calculation of Mix Design
5.4 Trial Mix, Adjustment and Determination of Mix Design
6 Construction
6.1 Production of Fiber Reinforced Concrete
6.2 Transportation, Casting and Curing of Fiber Reinforced Concrete
7 Quality Inspection and Acceptance
7.1 Quality Inspection of Raw Materials
7.2 Performance Inspection of Concrete Mixture
7.3 Performance Inspection of Hardened Fiber Reinforced Concrete
7.4 Inspection and Acceptance of Concrete Construction
Appendix A Method of Properties Examination of Steel Fiber for Concrete
Appendix B Test Method for Toughness (Equivalent Flexural Tensile Strengths) of Fiber Reinforced Concrete
Appendix C Test Method for Toughness and Initial Crack Strength of Fiber Reinforced Concrete
Appendix D Test Method for Shear Strength of Fiber Reinforced Concrete
Appendix E Influence Coefficient of Steel Fiber on Axial Tensile Strength and Flexural Tensile Strength of Concrete
Appendix F Test for Fraction of Steel Fiber by Volume in Steel Fiber Reinforced Concrete Mixture
Explanation of Wording in This Specification
List of Quoted Standards
1 General Provisions
1.0.1 This specification is prepared with a view to standardizing the application of fiber reinforced concrete in construction engineering, ensuring engineering quality, and achieving advanced technology, safety and reliability and cost-effectiveness.
1.0.2 This specification is applicable to the mix design, construction, and quality inspection and acceptance of steel fiber reinforced concrete and synthetic fiber reinforced concrete.
1.0.3 In addition to this specification, the application of fiber reinforced concrete also shall comply with those specified in the current relevant standards of the nation.
2 Terminologies
2.0.1 Steel fiber
The fiber made of thin steel wire by cutting off, thin steel sheet by cutting, steel ingot by milling or molten steel by extracting, etc.
2.0.2 Fiber reinforced concrete
The generic term of concrete mixed with short steel fiber or short synthetic fiber.
2.0.3 Steel fiber reinforced concrete
The concrete mixed with short steel fiber as reinforcing material.
2.0.4 Equivalent diameter
The diameter of a circular section which is converted according to the equal sectional area principle when the fiber section is noncircular.
2.0.5 Aspect ratio of fiber
The ratio of length to diameter (or equivalent diameter) of fiber.
2.0.6 Synthetic fiber
The fiber made of organic synthetic material via such technologies as extrusion, extension and modification.
2.0.7 Fibrillated fiber
The synthetic fiber which can form a net after being unfolded.
2.0.8 Synthetic fiber reinforced concrete
The concrete mixed with short synthetic fiber as reinforcing material.
2.0.9 Fiber content
The mass of fiber in every 1m3 of fiber reinforced concrete.
2.0.10 Fraction of fiber by volume
The percentage of the volume of fiber in the volume of concrete.
3 Raw Materials
Contents of JGJ/T 221-2010
1 General Provisions
2 Terminologies
3 Raw Materials
3.1 Steel Fiber
3.2 Synthetic Fiber
3.3 Other Materials
4 Technical Properties of Fiber Reinforced Concrete
4.1 Mixture Properties
4.2 Mechanical Properties
4.3 Long-term Properties and Durable Properties
5 Mix Design
5.1 General Requirements
5.2 Determination of Design Strength
5.3 Calculation of Mix Design
5.4 Trial Mix, Adjustment and Determination of Mix Design
6 Construction
6.1 Production of Fiber Reinforced Concrete
6.2 Transportation, Casting and Curing of Fiber Reinforced Concrete
7 Quality Inspection and Acceptance
7.1 Quality Inspection of Raw Materials
7.2 Performance Inspection of Concrete Mixture
7.3 Performance Inspection of Hardened Fiber Reinforced Concrete
7.4 Inspection and Acceptance of Concrete Construction
Appendix A Method of Properties Examination of Steel Fiber for Concrete
Appendix B Test Method for Toughness (Equivalent Flexural Tensile Strengths) of Fiber Reinforced Concrete
Appendix C Test Method for Toughness and Initial Crack Strength of Fiber Reinforced Concrete
Appendix D Test Method for Shear Strength of Fiber Reinforced Concrete
Appendix E Influence Coefficient of Steel Fiber on Axial Tensile Strength and Flexural Tensile Strength of Concrete
Appendix F Test for Fraction of Steel Fiber by Volume in Steel Fiber Reinforced Concrete Mixture
Explanation of Wording in This Specification
List of Quoted Standards
