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Chapter 19 — CONCRETE

Section 1903A

California Building Code (Title 24, Part 2) · 2019 edition · updated 2026-09-12 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

SPECIFICATIONS FOR TESTS AND MATERIALS

1903 A .1 General. Materials used to produce concrete, concrete itself and testing thereof shall comply with the applicable standards listed in ACI 318.

Exception: The following standards as referenced in Chapter 35 shall be permitted to be used.

1. ASTM C150

2. ASTM C595

3. ASTM C1157

1903 A .2 Special inspections. Where required, special inspections and tests shall be in accordance with 17A and Section 1910A.

1903 A .3 Glass fiber-reinforced concrete. Glass fiber-rein- forced concrete (GFRC) and the materials used in such con- crete shall be in accordance with the PCI MNL 128 standard.

1903 A .4 Flat wall insulating concrete form (ICF) systems. Insulating concrete form material used for forming flat con- crete walls shall conform to ASTM E2634. [OSHPD 1 & 4] Not Permitted by OSHPD.

1903A.5 Aggregates – Modify ACI 318 Section 26.4.1.2.1(a).(1) as follows:

(1) Normal weight aggregate: Aggregate shall be non- reactive as determined by one of the methods in ASTM C33 Appendix XI: Methods for Evaluating Potential for Deleterious Expansion Due to Alkali Reactivity of an Aggregate. Aggregates deemed to be deleterious or poten- tially deleterious may be used with the addition of a mate- rial that has been shown to prevent harmful expansion in accordance with Appendix XI of ASTM C33, when approved by the building official.

1903A.6 [OSHPD 1 & 4] Limits on cementitious materials. Modify ACI 318 Section 26.4.2.2(b) and Table 26.4.2.2(b) as follows:

The maximum percentage of pozzolans, including fly ash and silica fume, and slag cement in concrete assigned to all exposure categories shall be in accordance with Table 26.4.2.2(b) and Section 26.4.2.2(b) Items (1) and (2).

Where pozzolans are used as cementitous materials, dura- tion for minimum specified compressive strength of concrete (f’ c ) that exceeds 28 days shall be considered an alternative system.

1903A.7 Steel fiber reinforcement – Not permitted

1903A.8 Welding of reinforcing bars - Modify ACI 318 Sec- tion 26.6.4.1(b) by adding the following:

Subject to prior approval of the enforcing agency, longitudi- nal holding wires, conforming to ASTM A1064 of maximum wire size W5, that are machine resistance welded to stirrup/ tie cage (or spiral assemblies) consisting of low alloy steel reinforcing conforming to ASTM A706 are permitted when performed under continuous competent control in a fabrica- tion shop. Tack welding of primary reinforcing bars together or to stirrups/ties is not permitted. Holding wire weld loca- tions shall not occur on any longitudinal or primary reinforc-

r spiral assemblies) consisting of low alloy steel_ reinforcing conforming to ASTM A706 are permitted when performed under continuous competent control in a fabrica- tion shop. Tack welding of primary reinforcing bars together or to stirrups/ties is not permitted. Holding wire weld loca- tions shall not occur on any longitudinal or primary reinforc-

ing nor on any portion of a reinforcing bar that is or will be bent in accordance with ACI 318 Section 25.3 for the extents specified in AWS D1.4 Section 4.2.6.

[DSA-SS] Exception: Mat reinforcing for slabs or iso- lated footings shall be permitted to have holding wires located no more than six bar diameters from the free end of reinforcing. Such free ends shall not be associated with any welded splices, couplers, or other free-end modifica- tions involving reinforcement development.

Quality control tests shall be performed on shop-welded specimens by the fabricator. Reinforcing steel specimens con- taining the holding wire shall be tested for yield and tensile strength at the frequency required by Section 1910A.2. Test reports shall be available on request to the approved agency, design professional and enforcement agency.

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▸Contents — California Building Code (Title 24, Part 2)
California Building Code (Title 24, Part 2)
  1. Chapter 2 — DEFINITIONS AND ABBREVIATIONS
  2. Appendix G — FLOOD-RESISTANT
  3. Appendix L — EARTHQUAKE RECORDING
  4. Appendix M — TSUNAMI-GENERATED
  5. Chapter 1 — SCOPE AND ADMINISTRATION
  6. Chapter 3 — OCCUPANCY CLASSIFICATION AND USE
  7. Chapter 4 — SPECIAL DETAILED REQUIREMENTS BASED
  8. Chapter 5 — GENERAL BUILDING HEIGHTS AND AREAS
  9. Chapter 6 — TYPES OF CONSTRUCTION
  10. Chapter 7 — FIRE AND SMOKE PROTECTION FEATURES
  11. Chapter 7A — MATERIALS AND CONSTRUCTION
  12. Chapter 8 — INTERIOR FINISHES
  13. Chapter 9 — FIRE PROTECTION AND LIFE SAFETY SYSTEMS
  14. Chapter 10 — MEANS OF EGRESS
  15. Chapter 11A — HOUSING ACCESSIBILITY
  16. Chapter 11B — ACCESSIBILITY TO PUBLIC BUILDINGS, PUBLIC ACCOMM…
  17. Chapter 12 — INTERIOR ENVIRONMENT
  18. Chapter 14 — EXTERIOR WALLS
  19. Chapter 15 — ROOF ASSEMBLIES AND ROOFTOP STRUCTURES
  20. Chapter 16 — STRUCTURAL DESIGN
  21. Chapter 16A — STRUCTURAL DESIGN
  22. Chapter 17 — SPECIAL INSPECTIONS AND TESTS
  23. Chapter 18 — SOILS AND FOUNDATIONS
  24. ▸Chapter 19 — CONCRETE
    Overview
    1. Section 1901
    2. Section 1902
    3. Section 1903
    4. Section 1904
    5. Section 1905
    6. Section 1906
    7. Section 1907
    8. Section 1908
    9. Section 1909
    10. Section 1910
    11. Section 1911
    12. Section 1902A
    13. Section 1901A
    14. Section 1903A
    15. Section 1904A
    16. Section 1905A
    17. Section 1906A
    18. Section 1907A
    19. Section 1908A
    20. Section 1909A
    21. Section 1910A
    22. Section 1911A
  25. Chapter 20 — ALUMINUM
  26. Chapter 21 — MASONRY
  27. Chapter 22 — STEEL
  28. Chapter 23 — WOOD
  29. Chapter 24 — GLASS AND GLAZING
  30. Chapter 25 — GYPSUM BOARD, GYPSUM PANEL PRODUCTS AND PLASTER
  31. Chapter 26 — PLASTIC
  32. Chapter 27 — ELECTRICAL
  33. Chapter 28 — MECHANICAL SYSTEMS
  34. Chapter 30 — ELEVATORS AND CONVEYING SYSTEMS
  35. Chapter 31 — SPECIAL CONSTRUCTION
  36. Chapter 31B — PUBLIC POOLS
  37. Chapter 31C — RADIATION
  38. Chapter 31D — FOOD ESTABLISHMENTS
  39. Chapter 31F — MARINE OIL TERMINALS
  40. Chapter 32 — ENCROACHMENTS INTO THE PUBLIC RIGHT-OF-WAY
  41. Chapter 33 — SAFEGUARDS DURING CONSTRUCTION
  42. Chapter 35 — REFERENCED STANDARDS
  43. Appendix A — EMPLOYEE QUALIFICATIONS
  44. Appendix B — BOARD OF APPEALS
  45. Appendix C — GROUP U – AGRICULTURAL BUILDINGS
  46. Appendix D — FIRE DISTRICTS
  47. Appendix F — RODENTPROOFING
  48. Appendix H — SIGNS
  49. Appendix I — PATIO COVERS
  50. Appendix J — GRADING
  51. Appendix K — GROUP R-3 AND GROUP R-3.1 OCCUPANCIES
  52. Appendix N — REPLICABLE BUILDINGS
  53. Appendix O — EMERGENCY HOUSING

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