(a) Plot the grain-size distribution curve for this sample. (b) Determine D10, D30, and D60. (c) Calculate the uniformity coefficient, Cu. (d) Calculate the coefficient of gradation, Cc.

Following are the results of a sieve analysis:





What will be an ideal response?


(a) Grain-size distribution are shown as follows,



(b) From the preceding figure, D10 = 0.100 mm

D30 = 0.160 mm

D60 = 0.279 mm

(c) The coefficient of uniformity can be calculated using Equation 17.19:

Cu = (D60 / D10)

Cu = 0.279 / 0.100

Cu = 2.79

(d) The coefficient of curvature can be calculated using Equation 17.20:

Cc = D302 / (D60)(D10)

Cc = (0.160)2 / (0.279)(0.100)

Cc = 0.92

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