M40 Mix Design Calculator 2026 | IS 10262:2019 — 40 MPa Concrete

📅 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

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M40 Design Parameters

IS 10262:2019 Cl. 4 — fck = 40 MPa · Minimum Extreme exposure · SP mandatory for IS 456 compliance

● Structural Requirements

Grade (fixed M40)

Cement Type

IS 456 Exposure Class

Standard Deviation Source

Fly Ash Addition (%, 0 if none)

Added separately; k=0.25 per IS 10262 Cl. 5.7

● Aggregate & Workability

Max Aggregate Size (mm)

FA Grading Zone

Aggregate Type

Target Slump (mm)

Superplasticiser WR (%)

SP mandatory for IS 456 compliance at M40

Air Content (%)

● Material Properties

Cement SG

Coarse Agg SG

Fine Agg SG

CA DRBD (kg/m³)

SCM SG (FA≈2.20)

✅ 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

—

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

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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

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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 Max

450

kg/m³

5 Aggregate Proportioning

IS 10262:2019 Table 3 — Absolute volume method

—

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

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kgCO₂/m³

CO₂ from SCM

—

kgCO₂/m³

CO₂ from Agg

—

kgCO₂/m³

Total CO₂

—

kgCO₂/m³

Carbon Class

—

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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.

M40 Concrete Mix Design Calculator

🔢M40 Design Parameters

● Structural Requirements

● Aggregate & Workability

● Material Properties

✅ M40 Mix Design Complete — IS 10262:2019

1 Target Mean Strength

2 Water-Cement Ratio

3 Water Content

4 Cement Content

5 Aggregate Proportioning

6 Mix Proportions Summary

✅ IS 456:2000 Compliance Checklist — M40

7 Trial Mix Quantities & Programme

8 No-SP Comparison — Why SP Is Mandatory at M40

9 Embodied Carbon Estimate

📄M40 Grade Reference Data

🔎 M40 Grade — Key Facts

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M40 Design Parameters

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M40 Grade Reference Data