# 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 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) |
B-1 | |

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).

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 |