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The total mass of the sample was 147.2 g. (a) Plot the particle-size distribution curve and describe the soil. Comment on the flat part

of the curve (b) State the effective grain size

3.36 A liquid limit test carried out on a sample of inorganic soil taken from below the water table gave the following results:

Fall cone penetration y (mm) 15.5 18.2 21.4 23.6 Moisture content, wy % 34.6 40.8 48.2 53.4

A plastic limit test gave a value of 33%. Determine the average liquid limit and plasticity index of this soil and give its classification.