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Concrete mix ratios are the proportions of concrete components such as cement, sand, aggregates and water. These mix ratios are decided based on type of construction and mix designs.

However, building codes provides nominal and standard concrete mix ratios for various construction works based on experience and testing. These types of concrete mix ratios are discussed in this article.

Types of Concrete Mix Ratio and their Strengths

Types of Concrete Mix Ratio – Mix Designs

Nominal Concrete Mix Ratios

In the past the specifications for concrete prescribed the proportions of cement, fine and coarse aggregates. These mixes of fixed cement-aggregate ratio which ensures adequate strength are termed nominal mixes.

Nominal mixes offer simplicity and under normal circumstances, have a margin of strength above that specified. However, due to the variability of mix ingredients the nominal concrete for a given workability varies widely in strength.

Nominal mix ratios for concrete are 1:2:4 for M15, 1:1.5:3 for M20 etc.

Standard Mixes or Ratio

The nominal mixes of fixed cement-aggregate ratio (by volume) vary widely in strength and may result in under or over-rich mixes. For this reason, the minimum compressive strength has been included in many specifications. These mixes are termed standard mixes.

IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40. In this designation the letter M refers to the mix and the number to the specified 28 day cube strength of mix in N/mm2.

The mixes of grades M10, M15, M20 and M25 correspond approximately to the mix proportions (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively.

Designed Mix Ratio of Concrete

In these mixes the performance of the concrete is specified by the designer but the mix proportions are determined by the producer of concrete, except that the minimum cement content can be laid down. This is most rational approach to the selection of mix proportions with specific materials in mind possessing more or less unique characteristics.

The approach results in the production of concrete with the appropriate properties most economically. However, the designed mix does not serve as a guide since this does not guarantee the correct mix proportions for the prescribed performance.

For the concrete with undemanding performance nominal or standard mixes (prescribed in the codes by quantities of dry ingredients per cubic meter and by slump) may be used only for very small jobs, when the 28-day strength of concrete does not exceed 30 N/mm2. No control testing is necessary reliance being placed on the masses of the ingredients.

Following table provides details of different types of concrete mix ratios and their strengths.

Concrete Grade Mix Ratio Compressive Strength
MPa (N/mm2) psi
Normal Grade of Concrete
M5 1 : 5 : 10 5 MPa 725 psi
M7.5 1 : 4 : 8 7.5 MPa 1087 psi
M10 1 : 3 : 6 10 MPa 1450 psi
M15 1 : 2 : 4 15 MPa 2175 psi
M20 1 : 1.5 : 3 20 MPa 2900 psi
Standard Grade of Concrete
M25 1 : 1 : 2 25 MPa 3625 psi
M30 Design Mix 30 MPa 4350 psi
M35 Design Mix 35 MPa 5075 psi
M40 Design Mix 40 MPa 5800 psi
M45 Design Mix 45 MPa 6525 psi
High Strength Concrete Grades
M50 Design Mix 50 MPa 7250 psi
M55 Design Mix 55 MPa 7975 psi
M60 Design Mix 60 MPa 8700 psi
M65 Design Mix 65 MPa 9425 psi
M70 Design Mix 70 MPa 10150 psi

Read More:

What are the Types of Concrete? What are their Applications?

Concrete Calculator – Calculate Concrete for Slab, Beam, Column and Footings

Concrete – Definition, Grades, Components, Manufacture, Construction and Articles

Gopal Mishra

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10 Comments

  1. Haven't mentioned abt the mix ratio of M30, M35 and M40

  2. Great House, we learn many things from this site, Thanks to Mr. Gopal Mishra,

    Answer to the following Questinations.

    1. Defination for High Strength Concrete & Design a high strength concrete for use in the production of precast prestressed concrete to suit following requirements.
    A.CEMENT
    B.WATER
    C.FINE AGGREGATE
    D.COARSE AGGREGATE
    2. Are you add ADMIXTURE & If any possibility to reduce Stell, if it is possble Explain How it is possible?

  3. the joy of life is to do something has never been expected, nor done before.

  4. I m very happy with all information available by this site.

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