2.2 KiB
2.2 KiB
Concrete Reinforcement Requirements
Detailing Standards
- All detailing of reinforcing bars and accessories shall conform to:
- ACI Detailing Manual (ACI 315 and SP-66)
Material Standards
- Reinforcing bars shall conform to ASTM A615, Grade 60, with supplementary requirements.
Placement Drawings
- Complete reinforcing placement drawings, prepared per ACI 315, shall be:
- Reviewed by the engineer
- Available on the job site prior to and during concrete placement
Support and Chairs
- All reinforcing steel shall be supported at designed depth using plastic or metallic chairs, spaced 48 inches on center in all directions.
- Alternate chair systems may be used only if submitted in writing and approved by the Engineer of Record (EOR).
Hooks, Development, and Splices
- End hooks, development lengths, and splices shall conform to ACI 318 requirements.
- Reinforcement may be placed in bundles of no more than two bars, with a minimum clear distance of 3 inches between bundles or tendons.
Concrete Cover
- Concrete cover not specified on drawings shall comply with ACI 318. Minimum coverage requirements:
| Condition | Minimum Cover |
|---|---|
| Concrete cast against and permanently exposed to earth | 3" |
| Concrete exposed to earth or weather | No. 6 and larger: 2" No. 5 and smaller: 1½" |
| Concrete not exposed to weather or in contact with ground | ¾" |
Lap Splices
- Unless noted otherwise (UNO):
- Lap splices of reinforcement in ground-supported elements (grade beams, footings, mat foundations) shall be a minimum of 48×Ø, where Ø = bar diameter.
- Reinforcement in elevated structures shall follow the typical lap splice detail.