Thus, large concrete construction projects uses design mix concrete. This concrete offers mix proportions based on locally available material and offers economy in construction if large scale concrete construction is carried out. Use of design mix concrete requires good quality control during material selection, mixing, transportation and placement of concrete. Nominal mix takes care of factor of safety against various quality control problems generally occurring during concrete construction.ĭesign mix concrete are those for which mix proportions are obtained from various lab tests. Nominal mix concrete are those which are generally used for small scale construction and small residential buildings where concrete consumption is not high. There are two types of concrete mixes, nominal mix and design mix. Grade of concrete construction is selected based on structural design requirements.
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How to select suitable concrete grade for construction? For example, for M20 concrete, mix proportion will be 1:1.5:3 for cement:sand:coarse aggregates. These grade of concrete is converted into various mix proportions. For example, for a grade of concrete with 20 MPa strength, it will be denoted by M20, where M stands for Mix. Grade of concrete is denoted by prefixing M to the desired strength in MPa.
Grade of concrete is defined as the minimum strength the concrete must posses after 28 days of construction with proper quality control.
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