Calculator Calc Ratio 2
Key formulas: tC÷1000×p.pC+tS÷1000×p.pS+tSt÷1000×p.pSt; m.sand÷(m.sand+m.stone)×100
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Water-binder rule | W/B = αa·fb ÷ (fcu,0 + αa·αb·fb) with αa = 0.53, αb = 0.20 (crushed stone) | JGJ 55-2011 Specification for Mix Proportion Design of Ordinary Concrete |
| Trial strength | fcu,0 = fcu,k + 1.645σ; σ = 5.0 MPa for C25–C40 | JGJ 55-2011 Table 5.1.2 |
| Water and sand ratio | For 90 mm slump, 31.5 mm crushed aggregate: water ≈200 kg/m³, sand ratio 35%–41% | JGJ 55-2011 Tables 5.2/5.4 |
| Absolute volume check | Component volumes sum to 1 m³ (densities 3100/1000/2650/2700 kg/m³) | JGJ 55-2011 Section 6 |
内置 C15-C40 经验配合比，输入浇筑方量即可计算水泥、砂、石、水总用量，并结合单价估算材料成本，辅助备料与预算。