Chapter 19 — CONCRETE

Section 1903 — SPECIFICATIONS FOR TESTS AND MATERIALS

2025 California Building Code (Title 24, Part 2) · 2025 edition · ingested 2026-07-07 · California

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1903.1 General.

1903.1 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

1903.2 Glass fiber-reinforced concrete.

1903.2 Glass fiber-reinforced concrete. Glass fiber-reinforced concrete (GFRC) and the materials used in such concrete shall be in accordance with the PCI 128.

1903.3 Flat wall insulating concrete form (ICF) systems.

1903.3 Flat wall insulating concrete form (ICF) systems. Insulating concrete form material used for forming flat concrete walls shall conform to ASTM E2634. [OSHPD 1R, 2 & 5] Not Permitted by OSHPD.

1903.4 Steel fiber reinforcement - [OSHPD 1R, 2 & 5] Not permitted by OSHPD.

1903.4 Steel fiber reinforcement - [OSHPD 1R, 2 & 5] Not permitted by OSHPD. on Jul 18, 2025 11:14 AM (CDT) THEREUNDER. � CONCRETE

1903.5 Welding of reinforcing bars - [OSHPD 1R, 2 & 5] Modify ACI 318 Section…

1903.5 Welding of reinforcing bars - [OSHPD 1R, 2 & 5] Modify ACI 318 Section 26.6.4.1(b) by adding the following: Subject to prior approval of the enforcing agency, longitudinal 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 fabrication shop. Tack welding of primary rein- forcing bars together or to stirrups/ties is not permitted. Holding wire weld locations shall…