751.4 Reinforced Concrete Design Properties

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751.4.1 Reinforced Concrete

Classes of Reinforced Concrete

Below are classes of concrete for each type or portion of structure:

Box Culverts B-1
Retaining Walls B or B-1
Superstructure (General) B-2
Curbs and Parapets B-1
Safety Barrier Curbs B-1
Median Barrier Curbs B-1
Sidewalks B-2
Raised Median B-2
Slabs B-2
Box Girders B-2
Deck Girders B-2
Prestressed Precast Panels A-1
Prestressed I - Girders A-1
Prestressed Double -Tee Girders A-1
Integral End Bents (Above lower construction joint) B-2
Semi-Deep Abutments (Above construction joint under slab) B-2
Substructure (General) B
Integral End Bents (Below lower construction joint) B
Non-Integral End Bents B
Semi-Deep Abutments (Below construction joint under slab) B
Intermediate Bents B (*)
Intermediate Bent Columns, End Bents (Below construction
joint at bottom of slab in Cont. Conc. Slab Bridges)
Footings B
Drilled Shafts B-2
Cast-In-Place Pile B-1

(*) In special cases when a stronger concrete is necessary for design, Class B-1 may be considered for intermediate bents (caps, columns, tie beams, web beams, collision walls and/or footings).

Unit Stresses of Reinforced Concrete
Class of Concrete Aggregate Maximumsize (Inches) Cement Factor (barrels percubic yard) \,f'c (psi) \,fc (psi) \,n (*) \,E_c (ksi)
A-1 3/4 1.6 (Min.) 5,000 2,000 6 4074
B 1 1.4 (Min.) 3,000 1,200 10 3156
B-1 1 1.6 (Min.) 4,000 1,600 8 3644
B-2 1 1.875 (Min.) 4,000 1,600 8 3644
(*) Values of n for computations of strength only.

Reinforcing Steel
Reinforcing Steel (Grade 60) \,F_y = 60 ksi