Principles & Methods Concrete Mix Design

Principles & Methods Concrete Mix Design

Mix Design is the science of determining the relative proportions of the ingredients of concrete to achieve the desired properties in the most economical way.

Principles of Mix Design

The environment exposure condition for the structure

The grade of concrete, their characteristic strength’s and standard deviations

The type of cement

The types and sizes of aggregates and their sources of supply

The nominal maximum sizes of aggregates

Maximum and minimum cement content in kg/m3

Water cement ratio

The degree of workability of concrete based on placing conditions

Air content inclusive of entrained air

The maximum/minimum density of concrete

The maximum/minimum temperature of fresh concrete

Type of water available for mixing and curing

The source of water and the impurities present in it.

Factors Defining the Choice of Mix Proportions

Compressive Strength

Workability

Durability

Type, size and grading of aggregates

Aggregate-cement ratio

Methods of Concrete Mix Design

American Concrete Institute Committee 211 method

Bureau of Indian Standards Recommended method IS 10262-82

Road note No. 4 (Grading Curve) method

Department Of Environment (DOE – British) method

Trial and Adjustment Method

Fineness modulus method

Maximum density method

Indian Road Congress, IRC 44 method