Answer Happy

In order to determine whether or not the soil from a borrow area was suitable to be used as a Fill material for a retaining wall, particle size distribution (PSD) test was performed and the results were tabulated as below. Particle Size (mm) Mass Retained Particle Size (mm) Mass Retained 37.5 20 10 5 2 1.18 0 12.5 28.1 38.0 48.0 47.6 0.6 0.3 0.212 0.15 0.063 60.5 62.5 10.0 60.0 70.0 1.0 pan (1) Calculate % of mass passing for each sieve and plot the PSD curve for the soil sample. (6 marks) (ii) Determine D10, D30 and D60, (3 marks) (iii)Determine C, and Cc, (2 marks) (iv)Classify the soil according to the British Standard, and (2 marks) (v) Determine whether or not the soil can be used as a suitable fill material for the retaining wall if only well graded sand is required. Explain your answer. (1 mark)
63 um 20 BS sieve aperture size, mm 212 600 um 2 150 300 425 1.18 mm 6.3 3.35 5 10 14 37.5 63 28 50_75 mm 100 90 80 ------- ------ 70 --- 1 Percentage possing SO 50 40 30 20 10 0 0.002 0.006 0.02 0.06 0.2 2 6 20 60 0.6 Particle rire mm 200