B303.4 Concrete For Slabs - UpCodes

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CODE SNIPPETB303.4 Concrete for Slabs2023 FBC - Building, 8th edition > Appendix B Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction > Chapter B301 Construction Requirements for Passive Radon Control > B303 Floor Slab-on-Grade Buildings > B303.4 Concrete for SlabsGo To Full Code ChapterB303.4.1 Mix DesignMix designs for all concrete used in the construction of slab-on-grade floors shall specify a minimum design strength of 3,000 psi (20.7 MPa) at 28 days and a design slump not to exceed 4 inches (102 mm). On-site slumps shall not exceed 5 inches (127 mm), provided total water added to the mix including plant, transit and site added water does not exceed the following parameters:

1. For mixes using natural sands: 275 pounds per cubic yard [33 gallons (125 L)].
2. For mixes using manufactured sands: 292 pounds per cubic yard [35 gallons (132.5 L)].

B303.4.2 Concrete PlacementFor improved workability of concrete used in the construction of slab-on-grade floors, additional water and/or water-reducing admixtures shall be wed within the following constraints:

1. Slumps in excess of 5 inches (127 mm) shall be achieved through the use of midrange or high range water reducing admixtures. Water shall not be used in excess of the limitations.
2. Slumps of concrete containing midrange or high range water reducing admixtures shall not exceed 8 inches (203 mm).

B303.4.3 CuringConcrete slabs shall be cured continuously after pouring according to one of the following procedures:

1. Moist curing by means of ponding, fog spray or wet burlap for at least seven days.
2. Moist curing using impermeable cover sheet materials conforming with ASTM Cl71 for at least seven days.
3. Curing with liquid membrane forming compound according to manufacturer's specifications and conforming with ASTM C309.

Curing compounds shall be compatible with materials specified in Section B303.6.B303.4.4 LoadingLoading or use of the slab shall be delayed for a minimum of 48 hours after concrete placement. When the slab is used for material storage after the minimum 48-hour period, caution should be used to prevent impact loading.B303.4.5 Slab ReinforcementFloor slabs shall be reinforced by steel reinforcing bars at reentrant corners such as inside corners of an L-shaped slab. Reentrant corners shall have two pieces of #4 reinforcing bar 36 inches (914 mm) long placed diagonally to the corner, 12 inches (305 mm) apart, with the first bar placed 2 inches (51 mm) from the corner. All reinforcement shall be appropriately positioned in the upper third of the slab.

Related Code Sections

B303.4 Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction, Concrete for SlabsMix designs for all concrete used in the construction of slab-on-grade floors shall specify a minimum design strength of 3,000 psi (20.7 MPa) at 28...2023 FBC - Building, 8th edition > Appendix B Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction > Chapter B301 Construction Requirements for Passive Radon Control > B303 Floor Slab-on-Grade Buildings > B303.4 Concrete for SlabsB303.4 Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction, Concrete for SlabsMix designs for all concrete used in the construction of slab-on-grade floors shall specify a minimum design strength of 3,000 psi (20.7 MPa) at 28...2020 FBC - Building, 7th edition > Appendix B Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction > Chapter B301 Construction Requirements for Passive Radon Control > B303 Floor Slab-on-Grade Buildings > B303.4 Concrete for SlabsB303.4 Chapter 9B-52 F.A.C Florida Standard for Passive Radon-Resistant Construction, Concrete for SlabsMix designs for all concrete used in the construction of slab-on-grade floors shall specify a minimum design strength of 3,000 psi (20.7 MPa) at 28...2017 FBC - Building, 6th edition > Appendix B Chapter 9B-52 F.A.C Florida Standard for Passive Radon-Resistant Construction > B303 Floor Slab-on-Grade Buildings > B303.4 Concrete for SlabsB303.4 Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction, Concrete for SlabsMix designs for all concrete used in the construction of slab-on-grade floors shall specify a minimum design strength of 3,000 psi (20.7 MPa) at 28...2014 FBC - Building, 5th edition > Appendix B Chapter 9B-52 F.A.C. Florida Standard for Passive Radon-Resistant Construction > Chapter B301 Construction Requirements for Passive Radon Control > B303 Floor Slab-on-Grade Buildings > B303.4 Concrete for SlabsE303.2 , Concrete for SlabsDesign strength for all concrete mixes used in the construction of slab-on-grade floors shall be a minimum of 3,000 psi (21 MPa) at 28 days and shall...2023 FBC - Building, 8th edition > Appendix E > Chapter E301 Construction Requirements for Passive Controls > E303 Concrete Floors in Contact With Soil Gas > E303.2 Concrete for Slabs