Difference between coefficient of uniformity and coefficient of curvature
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Coefficient of curvature (Cc) should lie between 1 and 3 for well grade gravel and sand. Uniformity coefficient (Cu) is given by: Its value should be more than 4 for well graded gravel and more than 6 for well graded sand. Were, D60 = particle size at 60% finer.
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The coefficient of uniformity or the CU is the ratio of the D60 by D10, if the ratio is greater than 4, then the soil is considered as good quality soil. But if the ratio is less than 4 then the soil is considered as bad quality soil.
On the other hand, the coefficient of curvature is the ratio of (D30)2/(D10.D60),where D30, D10and D60 are particle diameters correspondingly 30% 10% and 60% finer than cumulative particle size distribution.
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