Concrete · Materials & serviceability
Concrete material properties calculator
Mean in-situ strength, Ec from density, flexural and direct tensile strength, and the stress-block parameters for a selected grade.
Standard: AS 3600 Cl 3.1 (Table 3.1.2)
Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Grade | 32 MPa | |
| Density | 2400 | kg/m³ |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| f′c | 32.00 | MPa |
| Mean in-situ fcmi (Table 3.1.2) | 35.00 | MPa |
| Ec = ρ^1.5 × 0.043√fcmi (≤ 40) or ρ^1.5(0.024√fcmi + 0.12) | 29,910 | MPa |
| Ec Table 3.1.2 | 30,100 | MPa |
| Flexural tensile 0.6√f′c | 3.39 | MPa |
| Direct tensile 0.36√f′c | 2.04 | MPa |
| α2 | 0.802 | |
| γ | 0.890 |
- ✓ Formula Ec within 10% of tabulated (ρ = 2400)
Method, formulas and assumptions
- f′c = CHOOSE(3,20,25,32,40,50,65,80,100) = 32 MPa
- Mean in-situ fcmi (Table 3.1.2) = CHOOSE(3,22,28,35,43,53,68,82,99) = 35 MPa
- Ec = ρ^1.5 × 0.043√fcmi (≤ 40) or ρ^1.5(0.024√fcmi + 0.12) = IF(35<=40,2400^1.5*0.043*SQRT(35),2400^1.5*(0.024*SQRT(35)+0.12)) = 29910 MPa
- Ec Table 3.1.2 = CHOOSE(3,24000,26700,30100,32800,34800,37400,39600,42200) = 30100 MPa
- Flexural tensile 0.6√f′c = 0.6*SQRT(32) = 3.3941 MPa
- Direct tensile 0.36√f′c = 0.36*SQRT(32) = 2.0365 MPa
- α2 = MAX(0.67,0.85-0.0015*32) = 0.802
- γ = MAX(0.67,0.97-0.0025*32) = 0.89
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.