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 Curlverts 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 B-2
(Above lower construction joint)
Semi-Deep Abutments B-2
(Above construction joint under slab)
Substructure (General) B (*)
Integral End Bents B
(Below lower construction joint)
Semi-Deep Abutments B
(Below construction joint under slab)
Intermediate Bents B
Columns B (*)
Intermediate Bent Columns, End Bents B-1
(Below construction joint at bottom of slab in Cont. Conc. Slab Bridges)
Footings B
Drilled Shafts B-2
Cast-In-Place Pile B-1


(*) For continuous concrete slab bridges or in special cases when a stronger concrete is deemed necessary by the designer, use class B-1 for columns and end bents below construction joint at bottom of slab.


Unit Stresses of Reinforced Concrete
Class of Concrete Aggregate Maximumsize (Inches) Cement Factor (barrels percubic yard) (psi) (psi) (*) (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) = 60 ksi