Material Properties
Comprehensive technical specifications for reinforced concrete design.
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Concrete Specifications
- Strength (f'c): 3000-8000 psi
- Unit Weight: 145-150 pcf
- Elastic Modulus: 57000√f'c
- Poisson's Ratio: 0.15-0.20
- Tensile Strength: 7.5√f'c
- Creep Factor: 2.0-4.0
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Reinforcement Properties
- Yield Strength: 60-75 ksi
- Ultimate Strength: 90-100 ksi
- Elastic Modulus: 29×10⁶ psi
- Elongation: 7-9%
- Bond Strength: 400-600 psi
- Development Length: 40db
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Durability Requirements
- Cover: 1.5-3 inches
- w/c Ratio: 0.40-0.50
- Air Content: 4-6%
- Slump: 3-5 inches
- Crack Width: 0.016"
- Corrosion Protection: Grade 60
Design Parameters
Critical specifications for reinforcement design:
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Flexural Design
- Min Steel Ratio: 200/fy
- Max Steel Ratio: 0.75ρb
- Tension Control: εt≥0.005
- Strength Factor: φ=0.9
- Moment Capacity: φMn
- Effective Depth: 0.9d
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Shear Design
- Stirrup Spacing: d/2
- Min Av: 50bws/fy
- Max Spacing: 24"
- Strength Factor: φ=0.75
- Concrete Contribution: 2√f'c
- Steel Contribution: Avfyd/s
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Serviceability
- Deflection Limit: L/360
- Crack Control: z≤175k
- Min Temperature: 0.0018
- Shrinkage: 0.0003
- Side Face: As=0.1%
- Load Factors: 1.2D+1.6L
Construction Requirements
Key specifications for implementation:
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Bar Details
- Splice Length: 1.3ld
- Hook Length: 12db
- Bend Diameter: 6db
- Bundle Size: ≤4 bars
- Side Cover: 1.5"
- Spacing: 1"-3"
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Placement Tolerances
- Depth (d): ±3/8"
- Cover: +3/8"
- Spacing: ±1"
- Bar Location: ±2"
- Stirrup Spacing: ±1"
- Cut Length: ±1"
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Quality Control
- Bar Grade: ASTM A615
- Concrete Test: ASTM C39
- Placement Check: ACI 318
- Curing Time: 7-28 days
- Inspection: Level 2
- Documentation: As-Built