Title: Section 1903 • Size: 20545
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= specified yield strength of nonprestressed reinforcement, psi (MPa).
1903.1 Tests of Materials.
1903.1.1 The building official may require the testing of any materials used in concrete construction to determine if materials are of quality specified.
1903.1.2 Tests of materials and of concrete shall be made by an approved agency and at no expense to the jurisdiction. Such tests shall be made in accordance with the standards listed in Section 1903.
1903.1.3 A complete record of tests of materials and of concrete shall be available for inspection during progress of work and for two years after completion of the project, and shall be preserved by the inspecting engineer or architect for that purpose.
1903.1.4 Material and test standards. The standards listed in this section labeled a "U.B.C. standard" are also listed in Chapter 35, Part II, and are part of this code. The other standards listed are recognized standards (see Sections 3502 and 3503).
1. ASTM C 845, Expansive Hydraulic Cement
2. U.B.C. Standard 19-1, Portland Cement and Blended Hydraulic Cements
1903.3.1 Guideline standards.
1. ASTM C 33, Concrete Aggregates
2. ASTM C 330, Lightweight Aggregates for Structural Concrete
3. ASTM C 332, Lightweight Aggregates for Insulating Concrete
4. Aggregates failing to meet the above specifications but which have been shown by special test or actual service to produce concrete of adequate strength and durability may be used where authorized by the building official.
1903.3.2 The nominal maximum size of coarse aggregate shall not be larger than:
1. One fifth the narrowest dimension between sides of forms, or
2. One third the depth of slabs, or
3. Three fourths the minimum clear spacing between individual reinforcing bars or wires, bundles of bars, or prestressing tendons or ducts.
These limitations may be waived if, in the judgment of the building official, workability and methods of consolidation are such that concrete can be placed without honeycomb or voids.
1903.4.1 Water used in mixing concrete shall be clean and free from injurious amounts of oils, acids, alkalis, salts, organic materials or other substances that may be deleterious to concrete or reinforcement.
1903.4.2 Mixing water for prestressed concrete or for concrete that will contain aluminum embedments, including that portion of mixing water contributed in the form of free moisture on aggregates, shall not contain deleterious amounts of chloride ions. See Section 1904.3.1.
1903.4.3 Nonpotable water shall not be used in concrete unless the following are satisfied:
1903.4.3.1 Selection of concrete proportions shall be based on concrete mixes using water from the same source.
1903.4.3.2 Mortar test cubes made with nonpotable mixing water shall have seven-day and 28-day strengths equal to at least 90 percent of strengths of similar specimens made with potable water. Strength test comparison shall be made on mortars, identical except for the mixing water, prepared and tested in accordance with approved standards.
1903.5 Metal Reinforcement.
1903.5.1 Reinforcement shall be deformed reinforcement, except that plain reinforcement may be used for spirals or tendons, and reinforcement consisting of structural steel, steel pipe or steel tubing may be used as specified in this chapter.
1903.5.2 Reinforcing bars to be welded shall be indicated on the drawings and welding procedure to be used shall be specified. Steel specifications, except for A 706, shall be supplemented to require a report of material properties necessary to conform to welding procedures specified in U.B.C. Standard 19-2.
1903.5.3 Deformed reinforcements.
1903.5.3.1 ASTM A 615, A 616, A 617, A 706, A 767 and A 775, Reinforcing Bars for Concrete
1903.5.3.2 Deformed reinforcing bars with a specified yield strength exceeding 60,000 psi (413.7 MPa) may be used, provided shall be the stress corresponding to a strain of 0.35 percent and the bars otherwise conform to approved national standards, see ASTM A 615, A 616, A 617,A 706, A 767 and A 775. See Section 1909.4.
1903.5.3.3 ASTM A 184, Fabricated Deformed Steel Bar Mats. For reinforced bars used in bar mats, see ASTM A 615, A 616, A 617, A 706, A 767 or A 775.
1903.5.3.4 ASTM A 496, Steel Wire, Deformed, for Concrete Reinforcement. For deformed reinforcing wire, see ASTM A 615, A 616, A 617, A 706, A 767 or A 775.
For deformed wire for concrete reinforcement, see ASTM A 496, except that wire shall not be smaller than size D4, and for wire with a specified yield strength exceeding 60,000 psi (413.7 MPa), shall be the stress corresponding to a strain of 0.35 percent, if the yield strength specified in design exceeds 60,000 psi (413.7 MPa).
1903.5.3.5 ASTM A 185, Steel Welded Wire, Fabric, Plain for Concrete Reinforcement. For welded plain steel wire fabric, see ASTM A 615, A 616, A 617, A 706, A 767 or A 775.
For welded plain wire fabric for concrete reinforcement, see ASTM 185, except that for wire with a specified yield strength exceeding 60,000 psi (413.7 MPa), shall be the stress corresponding to a strain of 0.35 percent, if the yield strength specified in design exceeds 60,000 psi (413.7 MPa). Welded intersections shall not be spaced farther apart than 12 inches (305 mm) in direction of calculated stress, except for wire fabric used as stirrups in accordance with Section 1912.14.
1903.5.3.6 ASTM A 497, Welded Deformed Steel Wire Fabric for Concrete Reinforcement. For welded deformed steel wire fabric, see ASTM A 615, A 616, A 617, A 706, A 767 or A 775.
For welded deformed wire fabric for concrete reinforcement, see ASTM A 497, except that for wire with a specified yield strength exceeding 60,000 psi (413.7 MPa), shall be the stress corresponding to a strain of 0.35 percent, if the yield strength specified in design exceeds 60,000 psi (413.7 MPa). Welded intersections shall not be spaced farther apart than 16 inches (406 mm) in direction of calculated stress, except for wire fabric used as stirrups in accordance with Section 1912.13.
1903.5.3.7 Deformed reinforcing bars may be galvanized or epoxy coated. For zinc or epoxy-coated reinforcement, see ASTM A 615, A 616, A 617, A 706, A 767 and A 775.
1903.5.4 Plain reinforcement.
1903.5.4.1 Plain bars for spiral reinforcement shall conform to approved national standards, see ASTM A 615, A 616 and A 617.
1903.5.4.2 For plain wire for spiral reinforcement, see ASTM A 82 except that for wire with a specified yield strength exceeding 60,000 psi (413.7 MPa), shall be the stress corresponding to a strain of 0.35 percent, if the yield strength specified in design exceeds 60,000 psi (413.7 MPa).
1903.5.5 Prestressing tendons.
1903.5.5.1 1. ASTM A 416, Uncoated Seven-wire Stress-relieved Steel Strand for Prestressed Concrete
2. ASTM A 421, Uncoated Stress-relieved Wire for Prestressed Concrete
3. ASTM A 722, Uncoated High-strength Steel Bar for Prestressing Concrete
1903.5.5.2 Wire, strands and bars not specifically listed in ASTM A 416, A 421 and A 722 may be used, provided they conform to minimum requirements of these specifications and do not have properties that make them less satisfactory than those listed.
1903.5.6 Structural steel, steel pipe or tubing.
1903.5.6.1 For structural steel used with reinforcing bars in composite compression members meeting requirements of Section 1910.14.7 or 1910.14.8, see ASTM A 36, A 242, A 572 and A 588.
1903.5.6.2 For steel pipe or tubing for composite compression members composed of a steel-encased concrete core meeting requirements of Section 1910.14.4, see ASTM A 53, A 500 and A 501.
1903.5.7 U.B.C. Standard 19-2, Welding Reinforcing Steel, Metal Inserts and Connections in Reinforced Concrete Construction
1903.6.1 Admixtures to be used in concrete shall be subject to prior approval by the building official.
1903.6.2 An admixture shall be shown capable of maintaining essentially the same composition and performance throughout the work as the product used in establishing concrete proportions in accordance with Section 1905.2.
1903.6.3 Calcium chloride or admixtures containing chloride from other than impurities from admixture ingredients shall not be used in prestressed concrete, in concrete containing embedded aluminum, or in concrete cast against stay-in-place galvanized metal forms. See Sections 1904.2.2 and 1904.3.1.
1903.6.4 ASTM C 260, Air-entraining Admixtures for Concrete
1903.6.5 ASTM C 494 and C 1017, Chemical Admixtures for Concrete
1903.6.6 ASTM C 618, Fly Ash and Raw or Calcined Natural Pozzolans for Use as Admixtures in Portland Cement Concrete
1903.6.7 U.B.C. Standard 19-6, Ground-iron Blast-furnace Slag for Use in Concrete and Mortars
1903.7 Storage of Materials. Cementitious materials and aggregate shall be stored in such manner as to prevent deterioration or intrusion of foreign matter. Any material that has deteriorated or has been contaminated shall not be used for concrete.
1903.8 Concrete Testing.
1. ASTM C 192, Making and Curing Concrete Test Specimens in the Laboratory
2. ASTM C 31, Making and Curing Concrete Test Specimens in the Field
3. ASTM C 42, Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
4. ASTM C 39, Compressive Tests
5. ASTM C 172, Sampling Fresh Concrete
6. ASTM C 496, Splitting Tensile Strength
7. U.B.C. Standard 19-7, Slump of Portland Cement Concrete
1903.9 Concrete Mix.
1. U.B.C. Standard 19-3, Ready-mixed Concrete
2. U.B.C. Standard 19-4, Concrete Made for Volumetric Batching and Continuous Mixing
3. U.B.C. Standard 19-5, Mill-mixed Gypsum Concrete and Poured Gypsum Roof Diaphragms
1903.10 Welding. The
welding of reinforcing steel, metal inserts and connections in
reinforced concrete construction shall conform to U.B.C. Standard
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