751.4 Reinforced Concrete Design Properties
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(*) Values of n for computations of strength only.
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.
| 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 |
| Reinforcing Steel | |
|---|---|
| Reinforcing Steel (Grade 60) | = 60 ksi |
