📅 IS 10262:2019 · IS 456:2000 · 2026
M40 Concrete Mix Design Calculator
Complete IS 10262:2019 step-by-step mix design for M40 grade concrete (fck = 40 MPa) — Extreme exposure, superplasticiser mandatory, IS 456 compliance check, trial mixes and carbon footprint
⚡ SP Mandatory Check
✅ IS 456 Extreme Exposure
🔢 OPC 53 / PCE SP
🌿 Carbon Footprint
📋 Trial Mix Quantities
🔢M40 Design Parameters
IS 10262:2019 Cl. 4 — fck = 40 MPa · Minimum Extreme exposure · SP mandatory for IS 456 compliance
● Structural Requirements
Added separately; k=0.25 per IS 10262 Cl. 5.7
● Aggregate & Workability
SP mandatory for IS 456 compliance at M40
● Material Properties
✅ M40 Mix Design Complete — IS 10262:2019
fck = 40 MPa · All quantities per m³ (SSD basis) ·
Cement—kg/m³
Water—L/m³
Fine Agg—kg/m³
Coarse Agg—kg/m³
SCM / FA—kg/m³
w/c Adopted—dimensionless
TMS (fcr)—MPa
Unit Weight—kg/m³
1 Target Mean Strength
IS 10262:2019 Cl. 5.3.2 — fcr = fck + 1.65 × S
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fck—MPa
σ—MPa
Margin—MPa
TMS (fcr)—MPa
Expected 7d—MPa
Expected 3d—MPa
2 Water-Cement Ratio
IS 10262:2019 Cl. 5.6 — Adopt lower of strength-derived and IS 456 Table 5 durability limit
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Strength w/c—IS 10262 Fig. 1
IS 456 Max w/c—Table 5
Adopted w/c—governs
Governing—
3 Water Content
IS 10262:2019 Table 2 — base value adjusted for MSA, slump, aggregate type and PCE SP
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Table 2 Base—L/m³
SP Reduction—L/m³
Design Water W—L/m³
4 Cement Content
IS 10262:2019 Cl. 5.5 — C = W / w/c · IS 456 max 450 kg/m³ · SP essential at M40
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Cement Content—kg/m³
SCM Added—kg/m³
Effective w/c—k=0.25
IS 456 Min—kg/m³
IS 456 Max450kg/m³
5 Aggregate Proportioning
IS 10262:2019 Table 3 — Absolute volume method
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jc—volume fraction
Coarse Aggregate—kg/m³
Fine Aggregate—kg/m³
Volume Balance—m³
Unit Weight—kg/m³
FA / Total Agg—%
6 Mix Proportions Summary
Per m³ of concrete — SSD basis
| Material | Quantity | Volume (m³/m³) | Ratio to C | IS Standard |
|---|
✅ IS 456:2000 Compliance Checklist — M40
7 Trial Mix Quantities & Programme
IS 10262:2019 Cl. 9 — Three trial batches (30 L each) at design w/c ± 10%
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| Trial | w/c | Cement (kg) | Water (L) | FA (kg) | CA (kg) | Exp. 28d (MPa) | Purpose |
|---|
IS 10262 Trial Mix Requirements (Cl. 9): Minimum 3 batches. Accept if 28-day mean strength ≥ TMS (— MPa) with slump within ±25mm of design. For M40, trial cubes should be cast at minimum 6 per trial (3 for 7d, 3 for 28d). If 28d result < 0.9 × TMS, redesign with lower w/c or higher cement.
8 No-SP Comparison — Why SP Is Mandatory at M40
Demonstrating IS 456 violation when SP is omitted for M40 concrete
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9 Embodied Carbon Estimate
ICE Database v3.0 (2023) — Indicative embodied carbon per m³
CO₂ from Cement—kgCO₂/m³
CO₂ from SCM—kgCO₂/m³
CO₂ from Agg—kgCO₂/m³
Total CO₂—kgCO₂/m³
Carbon Class—
📄M40 Grade Reference Data
IS 456:2000, IS 10262:2019 and IS 1343:2012 specifications for M40 concrete
🔎 M40 Grade — Key Facts
- Characteristic Cube Strength: fck = 40 MPa at 28 days (150mm cube, IS 516)
- IS 456 Classification: Minimum for Extreme exposure class (IS 456 Table 5)
- Target Mean Strength: fcr = 40 + 1.65 × 5.0 = 48.25 MPa (σ = 5.0 MPa assumed)
- IS 456 max w/c: 0.40 (Extreme) · Max cement: 450 kg/m³ · Min cement: 360 kg/m³
- Superplasticiser: MANDATORY — without SP, w/c = 0.40 gives cement ≈ 465 kg/m³ (exceeds IS 456 max of 450 kg/m³)
- EN 206 Equivalent: C32/40 (cylinder f’c ≈ 32 MPa)
- ACI f’c Equivalent: ≈ 32 MPa cylinder = 4,640 psi
- IS 1343 Prestressed: M40 is the minimum grade for pre-tensioned prestressed concrete (IS 1343 Cl. 6.1.2)
- Nominal cover (Extreme): 75 mm minimum (IS 456 Table 16)
- Typical applications: Bridge decks, offshore platforms, industrial floors, extreme marine structures, pre-tensioned PSC
⚠️ SP is Not Optional at M40 — IS 456 Compliance Requirement: At fck = 40 MPa with Extreme exposure (max w/c = 0.40), the base water content from IS 10262 Table 2 is 186 L/m³ (20mm MSA, 75mm slump). Without SP: Cement = 186 / 0.40 = 465 kg/m³ — this EXCEEDS IS 456 Cl. 8.2.4.2 maximum of 450 kg/m³. A PCE superplasticiser achieving ≥18% water reduction brings cement to ≤412 kg/m³ — within IS 456 limits. Without SP, the M40 design is inherently non-compliant with IS 456.