To determine whether a soil is well-, poorly-, or gap-graded, a known mass of dr

Question

To determine whether a soil is well-, poorly-, or gap-graded, a known mass of dry soil is passed, through a column of sieves that have progressively smaller openings. If the mass of each sieve i known, the mass retained on each can be determined by weighing the sieves after shaking. This can be convened to % passing. Fill in the table below using the data provided. Note that % Passing is a cumulative calculation, i.e., for Sieve #4, % passing is 100% - Percent Retained. For Sieve #10, use the value calculated for Sieve #4 and subtract the % Retained on Sieve #10 and so on.

Explanation / Answer

Soil retained Percent retain percent pessing

#4 ------------> 49.9   (49.9/523.7)*100=9.52% 100%- 9.52=90.47

#10 --------->36.5 (36.5/523.7)*100= 6.96 and add 9.52= 16.48% 100-16.48=83.52

#20----------->42.1 8.03+16.48= 24.51% 100-24.51=75.49

#40-----------> 40.    7.6380+24.51= 32.148 100-32.148= 67.8520

#60-------------->23    4.3918+32.148= 36.5398 100-36.53=63.47

#140----------->91   17.3764+36.5=53.8764 100-53.8764=46.12

#200-----------> 10.2 1.9477+53.8764= 55.8241 100- 55.8241=44.1759

pan ->231     44.1092+55.82= 99.9292 100- 99.9292= 0.0708%

look carefully how previous retain percent added to the next and rest is simple

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