Mix Design by Concrete Grade 2026
Complete Reference M5 to M100+ — Typical Mix Proportions, Water-Cement Ratio, Cement Content, IS 456:2000 Exposure Requirements, Admixture Needs, Applications & Key Design Notes for Every Standard Concrete Grade per IS 10262:2019, IS 456 & ACI 318-19
M5 to M100+IS 10262:2019
IS 456:2000 Table 5Nominal Mix
Designed MixHSC & UHPC
ACI 318-19
📊 Concrete Grade Selection — 2026 Overview
IS 456:2000 — Structural
IS 10262:2019 — Mix Design
IS 1343:2012 — Prestressed
ACI 318-19
EN 206:2013
fib MC 2020
Concrete grade selection is the first structural decision on any project — and one of the most consequential. The wrong grade costs money (over-specification) or structural integrity (under-specification against IS 456:2000 exposure class limits). This reference covers all 14 standard grades from M5 through M100+, providing typical mix proportions, IS 456 compliance parameters, common applications, admixture requirements, and key notes for each grade.
Grades M5–M20 use IS 456:2000 Table 9 nominal mixes. Grades M25 and above require designed mixes per IS 10262:2019. Grades M50 and above are classified as High Strength Concrete (HSC) requiring specialist aggregate selection, silica fume, and high-range PCE SP. UHPC (M100+) has no current Indian standard — design to fib Bulletin 65 / fib MC 2020.
The Two Critical Selection Rules
Rule 1 — IS 456:2000 Table 5 (Exposure Class): Minimum grade is set by the exposure class of the structural element — not just by strength demand. Mild = M20 min; Moderate = M25; Severe = M30; Very Severe = M35; Extreme = M40. Specifying M25 for a Very Severe exposure element violates IS 456 regardless of structural analysis results.
Rule 2 — IS 456:2000 Cl.9.1 (Nominal vs Designed): Grades M5–M20 may use nominal mix ratios per Table 9. Grades M25 and above MUST use IS 10262:2019 designed mix with mandatory trial mixes. Using nominal mix ratios for M25+ is not permitted under IS 456.
Nominal
M5
fck = 5 MPa | Nominal Mix 1:5:10
Very Lean Fill — Oversite & Void Fill
| Nominal Mix | 1 : 5 : 10 (Cement : FA : CA) |
| w/c (max) | 0.80 (IS 456 Table 9) |
| Cement (min) | 160 kg/m³ |
| Typical cement | 160–190 kg/m³ |
| Water | 128–150 L/m³ |
| MSA | 40–80mm (mass lean fill) |
| Slump | 75–125mm (easy flowable) |
| SP | None |
| IS 456 Exposure | Not applicable (non-structural) |
IS 456 Table 9
Nominal mix OK
No reinforcement
Very rare in modern practice. Used only for oversite concrete in non-structural situations, mass fill under embankments, or temporary works. No structural use under any IS 456 exposure class.
Nominal
M10
fck = 10 MPa | Nominal Mix 1:3:6
Blinding PCC · Levelling · DLC · Cyclopean
| Nominal Mix | 1 : 3 : 6 |
| w/c (max) | 0.70 (IS 456 Table 9) |
| Cement (min) | 210 kg/m³ |
| Typical cement | 210–240 kg/m³ |
| Water | 145–170 L/m³ |
| FA : CA | 28–32% : 72–68% |
| MSA | 40mm (blinding); 80mm (mass) |
| Slump | 50–125mm (application dependent) |
| IS 456 Exposure | Non-structural plain concrete only |
IS 456 Table 9
Plain concrete only
DLC sub-base
Workhorse of site preparation. Foundation blinding (75–100mm under foundations), levelling screeds, plain fill, DLC sub-base (IRC:SP:62). Economy is primary driver — use 40–80mm MSA to minimise cement. See M10 Calculator.
Nominal
M15
fck = 15 MPa | Nominal Mix 1:2:4
Plain Footings · Higher-Spec Blinding · Non-RCC
| Nominal Mix | 1 : 2 : 4 |
| w/c (max) | 0.60 |
| Cement (min) | 240 kg/m³ |
| Typical cement | 240–280 kg/m³ |
| Water | 155–175 L/m³ |
| FA : CA | 32–36% : 68–64% |
| MSA | 40mm (standard for plain section) |
| Slump | 50–100mm |
| IS 456 Exposure | Plain concrete: Mild permitted |
IS 456 Table 9
Nominal mix
Higher blinding spec
Better than M10 for aggressive soil sites (Class 2 sulfate). Sometimes specified for better quality blinding where M10 is marginal. Plain gravity walls, small unreinforced sections, mass fill where moderate strength needed.
Nominal / Designed
M20
fck = 20 MPa | IS 456 Mild Exposure Min
Residential Slabs · Light Structural · Road Kerbs
| Nominal Mix | 1 : 1.5 : 3 (last nominal grade) |
| w/c (max) | 0.55 (nominal); 0.60 (IS 456 Mild) |
| Cement (min) | 300 kg/m³ (IS 456 Table 5) |
| Typical cement | 300–340 kg/m³ |
| Water | 165–190 L/m³ |
| FA : CA | 38–42% : 62–58% |
| MSA | 20–40mm |
| Slump | 75–125mm |
| IS 456 Exposure | Mild (min) — max w/c 0.60 |
| SP | Optional (WRA acceptable) |
IS 456 Mild min
Last nominal mix grade
Designed mix recommended
IS 456 Table 9 permits nominal mix for M20 but designed mix per IS 10262 is strongly recommended for RCC. Common in residential construction but often under-specified for actual exposure — check IS 456 Table 3 exposure class before selecting M20.
Designed Mix
M25
fck = 25 MPa | IS 456 Moderate Min | fcm = 33.25 MPa
General RCC · Commercial Buildings · Standard Slabs
| Design Basis | IS 10262:2019 — trial mix mandatory |
| Target fcm | 33.25 MPa (fck + 1.65×5.0) |
| w/c range | 0.45–0.50 (IS 456 max 0.50 Moderate) |
| Cement (min) | 300 kg/m³ (IS 456 Moderate) |
| Typical cement | 300–360 kg/m³ |
| Water | 170–195 L/m³ (20mm MSA, 100mm slump) |
| FA : CA | 38–42% : 62–58% |
| MSA | 20mm (standard) |
| Slump | 75–125mm (S3) |
| SP | WRA optional; PCE for pump |
| IS 456 Exposure | Moderate (min) — max w/c 0.50 |
IS 456 Moderate
Designed mix ONLY
Most common non-marine
The most common structural concrete grade in Indian commercial construction. IS 10262:2019 designed mix mandatory — IS 456 explicitly prohibits nominal mix for M25+. Use OPC 53 or PPC; PCE SP for pump delivery.
Designed Mix
M30
fck = 30 MPa | IS 456 Severe Min | fcm = 38.25 MPa
Severe Exposure · Bridges · Infrastructure
| Target fcm | 38.25 MPa |
| w/c range | 0.40–0.45 (IS 456 max 0.45 Severe) |
| Cement (min) | 320 kg/m³ (IS 456 Severe) |
| Typical cement | 350–420 kg/m³ |
| Water | 150–185 L/m³ (with PCE) |
| FA : CA | 38–42% : 62–58% |
| MSA | 20mm (standard) |
| Slump | 75–150mm (S3–S4) |
| SP | PCE 0.8–1.2% bwoc (recommended) |
| IS 456 Exposure | Severe (min) — max w/c 0.45 |
| Cover (beam) | 45mm minimum |
IS 456 Severe
PCE SP recommended
Trial mix mandatory
Minimum for Severe exposure — alternate wet/dry, coastal spray, severe rain. M30 is also minimum for many infrastructure specifications. PCE SP strongly recommended to achieve target fcm within IS 456 w/c limit. See M30 Mix Design Calculator.
Designed Mix
M35
fck = 35 MPa | IS 456 Very Severe Min | fcm = 43.5 MPa
Very Severe Exposure · Marine · Bridges · HSC Start
| Target fcm | 43.5 MPa |
| w/c range | 0.36–0.40 (IS 456 max 0.40 V.Severe) |
| Cement (min) | 360 kg/m³ (IS 456 Very Severe) |
| Typical cement | 380–450 kg/m³ |
| Water | 150–175 L/m³ (with PCE) |
| FA : CA | 38–42% : 62–58% |
| MSA | 16–20mm |
| Slump | 100–175mm (S3–S5) |
| SP | PCE 1.0–1.5% bwoc (required) |
| Cement type | OPC 53 + 30–40% GGBS preferred |
| IS 456 Exposure | Very Severe (min) — max w/c 0.40 |
IS 456 V.Severe
PCE required
GGBS for durability
Minimum for sea water, deicing salts, coastal areas, aggressive groundwater. GGBS blending (30–50%) significantly improves chloride resistance. Consider CIA (corrosion inhibitor) for coastal structures. Also the starting point for bridge deck specifications per IRC:112.
HSC Start
M40
fck = 40 MPa | IS 456 Extreme Min | fcm = 49 MPa
Extreme Exposure · High-Rise · Prestressed · Pavement
| Target fcm | 49 MPa (SD = 5.5 MPa for M40) |
| w/c range | 0.32–0.38 |
| Cement (min) | 380 kg/m³ (IS 456 Extreme) |
| Typical cement | 400–480 kg/m³ |
| Water | 145–170 L/m³ (with high-range PCE) |
| FA : CA | 36–40% : 64–60% |
| MSA | 16–20mm |
| Slump | 100–175mm (PCE slump retention) |
| SP | PCE 1.2–1.8% bwoc (required) |
| SCMs | OPC 53 + SF 5–8% (for durability) |
| IS 456 Exposure | Extreme (min) — max w/c 0.35 |
IS 456 Extreme
High-range PCE essential
SF for durability
PQC pavement min
Tidal zone, harsh chemicals, abrasion + aggression. Also minimum for PQC rigid pavement (IRC:58: MR ≥ 4.5 MPa ≈ M40). Minimum for prestressed/post-tensioned concrete (IS 1343). Silica fume (5–8%) recommended for chloride-critical applications.
HSC
M45
fck = 45 MPa | High Rise Columns | fcm = 54.75 MPa
High-Rise Columns · Bridges · Durability Critical
| Target fcm | 54.75 MPa |
| w/c range | 0.30–0.36 |
| Typical cement | 430–500 kg/m³ |
| Water | 140–165 L/m³ |
| FA : CA | 36–40% : 64–60% |
| MSA | 16–20mm |
| SP | PCE 1.3–2.0% bwoc (required) |
| SCMs | OPC 53 + 8–12% SF |
| Aggregate | Hard granite or basalt (ACV ≤ 28%) |
PCE required
Silica fume 8–12%
Hard aggregate
Common in high-rise column and core wall specification where column size reduction is desired. OPC 53 + 10% silica fume combination significantly improves density and reduces permeability. Aggregate quality starts to matter at M45+.
HSC
M50
fck = 50 MPa | HSC Standard | fcm = 60.75 MPa
Precast Prestressed · Bridge Beams · Tall Buildings
| Target fcm | 60.75 MPa (SD = 6.5 MPa for M50+) |
| w/c range | 0.28–0.34 |
| Typical cement | 450–520 kg/m³ |
| Water | 135–160 L/m³ |
| FA : CA | 34–38% : 66–62% |
| MSA | 12.5–16mm (aggregate strength governs) |
| SP | PCE 1.5–2.2% bwoc high-range |
| SCMs | OPC 53 + 10% SF mandatory |
| Aggregate | Basalt or hard granite (ACV ≤ 25%) |
| Curing | Steam (precast) or extended moist 14d |
SF mandatory M50+
Aggregate quality critical
RCPT <2000 coulombs
Boundary between standard and specialist HSC. Silica fume (10%) becomes mandatory for consistent 50 MPa achievement. Aggregate quality is a co-governing factor. Trial mix with actual materials essential — design mix tables give starting points only. Common in precast prestressed beams.
HSC
M60
fck = 60 MPa | Specialist HSC | fcm = 70.75 MPa
Specialist Precast · Marine Piles · High-Rise Core
| Target fcm | 70.75 MPa |
| w/c range | 0.25–0.32 |
| w/powder ratio | 0.22–0.28 (water/total powder) |
| Typical cement | 480–560 kg/m³ |
| Water | 130–155 L/m³ |
| FA : CA | 32–36% : 68–64% |
| MSA | 10–16mm |
| SP | PCE 1.8–2.5% bwoc |
| SCMs | OPC 53 + 10–12% SF |
| Aggregate | Basalt (ACV ≤ 22%; Sg ≥ 2.70) |
Specialist design
Basalt/quartzite only
RCPT <1000 coulombs
Aggregate strength becomes the limiting factor at M60 — limestone is excluded. Basalt or quartzite with ACV ≤22% required. High-shear mixing recommended. RCPT target <1000 coulombs for durability-critical applications. Brittleness increases — structural detailing for ductility critical.
VHSC
M70
fck = 70 MPa | Very High Strength | fcm = 80.75 MPa
Offshore · Long-span Precast · Specialist
| Target fcm | 80.75 MPa |
| w/c (effective) | 0.22–0.28 |
| Typical cement | 520–600 kg/m³ |
| Silica Fume | 12–15% bwoc — mandatory |
| Water | 125–145 L/m³ |
| MSA | 10–12.5mm |
| SP | PCE 2.0–3.0% bwoc high-range |
| Aggregate | Basalt/quartzite (ACV ≤ 20%) |
| Mixing | High-shear mixer; extended cycle |
Specialist design only
No Indian IS standard
ACI 363R guidance
No dedicated Indian IS standard for M70+. Design to ACI 363R-10 (High-Strength Concrete) or EN 206/EN 1992 C55/67 and above. Aggregate quality is the dominant limiting factor — concrete cannot exceed the paste-aggregate bond strength at the ITZ without specialist treatment.
VHSC
M80
fck = 80 MPa | Ultra-High Strength Transition | fcm = 91 MPa
Nuclear · Offshore Platform · Long-span Bridge
| Target fcm | 91 MPa (SD = 6.5 MPa) |
| w/c (effective) | 0.20–0.26 |
| Typical cement | 560–650 kg/m³ |
| Silica Fume | 15–20% bwoc |
| Nano-silica | 1–3% considered for M80+ |
| Water | 115–135 L/m³ |
| MSA | 9.5–12.5mm (high quality) |
| SP | PCE 2.5–3.5% bwoc |
| Aggregate | Quartzite or basalt (tested per batch) |
Specialist engineer
Research-level mix design
Nano-silica emerging
At M80, conventional mix design approaches reach their limits. Interfacial Transition Zone (ITZ) between aggregate and paste becomes the critical weak link. Nano-silica or reactive powder additions improve ITZ density. Few Indian production batching plants routinely produce M80. Steam curing usually required.
UHPC 2026
M100+
fck = 100–200+ MPa | UHPC | No coarse aggregate
UHPC — Ultra High Performance Concrete
| Typical strength | M100–M200+ (fck 100–200+ MPa) |
| w/c | 0.16–0.25 (near theoretical minimum) |
| Cement | 700–900 kg/m³ (OPC 53 only) |
| Silica Fume | 20–30% bwoc (Sg 2.20) |
| Fine aggregate | Quartz sand 0.125–0.5mm ONLY |
| Coarse aggregate | NONE — all fine matrix |
| Quartz flour | 250–350 kg/m³ reactive powder |
| Steel fibres | 130–200 kg/m³ (2–2.5% volume) |
| SP | PCE powder 3–6% bwoc |
| Heat curing | 90°C steam 48h → +20–30% strength |
No IS standard 2026
fib Bulletin 65
Specialist mixer required
AFGC/SETRA France
⚠ No coarse aggregate — quartz sand and quartz flour matrix only. Steel fibre reinforcement provides tensile strength (8–15 MPa). Requires high-shear Eirich or planetary mixer, 15+ minute mixing cycles. No current Indian IS standard — design to fib Bulletin 65 (2013) or French AFGC/SETRA guideline. Structural design per fib Model Code 2020.
📋 Master Grade Reference Table 2026 — M5 to M100+
← Scroll to view full table
| Grade | fck (MPa) | fcm (MPa) | Nominal Mix | w/c (max) | Cement (kg/m³) | Water (L/m³) | IS 456 Exposure Min | SP Required? | SCM | Primary Application |
|---|---|---|---|---|---|---|---|---|---|---|
| M5 | 5 | — | 1:5:10 | 0.80 | 160 | 128–150 | Not structural | None | None | Oversite fill |
| M10 | 10 | 15.8 | 1:3:6 | 0.70 | 210 | 145–165 | Plain concrete only | None | None | Blinding, DLC |
| M15 | 15 | 21.8 | 1:2:4 | 0.60 | 240 | 155–175 | Plain / Mild (plain) | None | Optional | Lean PCC, fill |
| M20 | 20 | 28.25 | 1:1.5:3 | 0.55 | 300 | 165–190 | Mild (min) | Optional | Optional | Residential RCC |
| M25 | 25 | 33.25 | Designed | 0.50 | 300 | 165–185 | Moderate (min) | Optional | Optional | Commercial buildings |
| M30 | 30 | 38.25 | Designed | 0.45 | 320 | 150–185 | Severe (min) | Recommended | PPC/PSC | Bridges, infrastructure |
| M35 | 35 | 43.5 | Designed | 0.40 | 360 | 150–175 | V.Severe (min) | Required | GGBS recommended | Marine, coastal bridge |
| M40 | 40 | 49.0 | Designed | 0.35 | 380 | 145–170 | Extreme (min) | Required | SF 5–8% | Tidal, PT, pavement |
| M45 | 45 | 54.75 | Designed | 0.32 | 420 | 140–165 | Extreme + | Required | SF 8–12% | High-rise columns |
| M50 | 50 | 60.75 | Designed | 0.30 | 450 | 135–160 | Specialist | Required HR | SF 10% mandatory | Precast PSC beams |
| M60 | 60 | 70.75 | Designed | 0.27 | 480 | 130–155 | Specialist | Required HR | SF 10–12% | Marine piles, specialist |
| M70 | 70 | 80.75 | Designed | 0.25 | 530 | 125–145 | Specialist (no IS) | Required HR | SF 12–15% | Offshore, long-span |
| M80 | 80 | 91.0 | Designed | 0.22 | 580 | 115–135 | Research / Specialist | Required HR | SF 15–20% + nano-Si | Nuclear, offshore platform |
| M100+ | 100–200+ | — | UHPC — no coarse aggregate | 0.16–0.25 | 700–900 | 115–130 | No IS standard | PCE powder 3–6% | SF 20–30% + steel fibres | UHPC structures |
📚 Standards Reference by Grade Category 2026
Standards Governing Each Grade Range
M5–M20 (Nominal Mix Grades): IS 456:2000 Table 9 governs nominal mix proportions (M5–M20 only). No IS 10262 trial mix required for nominal mix grades. IS 456 Table 5 exposure class requirements still apply for structural use. Maximum grade for nominal mix is M20.
M25–M60 (Designed Mix — Standard to HSC): IS 10262:2019 Absolute Volume Method mandatory. IS 456:2000 Table 5 exposure class limits apply. IS 9103:1999 for admixtures. IS 12269 (OPC 53), IS 1489 (PPC), IS 455 (PSC), IS 15388 (SF) — cement/SCM standards. ACI 363R-10 — High-Strength Concrete (M50+). EN 206 Strength classes C28/35 (M35) to C50/60 (M60).
M70–M80 (Very High Strength): No dedicated Indian IS standard. Design to ACI 363R-10 or EN 1992-1-1 C55/67 and C60/75 classes. Structural design per IS 456 with enhanced material characterisation. Specialist concrete engineer involvement mandatory.
M100+ UHPC: No Indian IS standard (2026). Design to fib Bulletin 65 (2013) — UHPC constitutive laws; AFGC/SETRA Ultra High Performance Fibre-Reinforced Concretes (2013); fib Model Code 2020 — structural design provisions for UHPC. No equivalent BIS standard expected before 2027.