Characteristics strength:It is the minimum strength of concrete for which the designer has reasonable assurance. Mathematically it the compressive strength of material above which 95 percent of the test result of the 15 cm cube (after 28 days) are expected to exceed.
Grade of concrete: it is the number which denotes the characteristics strength expressed in MPa. The number is usually preceded by the letter M which refers to mix.
Nominal mix is the fixed proportion of cement:sand:coarse aggregate(by mass or by volume).It is the approximation of grade of concrete and their nominal mix.The actual proportion for a grade of concrete can only be known from mix design method.Some grade of concrete and their respective nominal mixes are given below:
M10 - 1:3:6
M15 - 1:2:4
M20 - 1:1.5:3
M25 - 1:1:2
Grade of concrete: it is the number which denotes the characteristics strength expressed in MPa. The number is usually preceded by the letter M which refers to mix.
Nominal mix is the fixed proportion of cement:sand:coarse aggregate(by mass or by volume).It is the approximation of grade of concrete and their nominal mix.The actual proportion for a grade of concrete can only be known from mix design method.Some grade of concrete and their respective nominal mixes are given below:
M10 - 1:3:6
M15 - 1:2:4
M20 - 1:1.5:3
M25 - 1:1:2
wow nice explanation about characteristic strength of concrete
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