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<< Click to Display Table of Contents >> Calculations |
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The following calculations are used in this test:
Sieve Cumulative % Passing
Cumulative % Passing = 100 * ( 1 - Mc / Ms)
where,
Mc = Cumulative mass retained
Ms = Dry sample mass
Hydroscopic Moisture
C (%) = 100 * (Ma - Mo) / Mo
where,
C = Hydroscopic moisture
Ma = Air dried sample mass
Mo = Oven dried sample mass
Corrected Oven-Dried Mass
W = (Mhs * Mo / Ma) / (1 + Mr10 / Ms) Mass retained on #10 of Total Sample Method
W = 100 * (Mhs - Mr10) / (100 + C) Mass retained on #10 of Hydrometer Sample Method
W = 100 * (Mhs / P200) / (100 + C) Percent finer than #10 Method
where,
W = Corrected oven-dried mass
Mhs = Mass of hydrometer sample
Mr10 = Mass retained on #10 sieve
P200 = Percentage finer than #200
Hydrometer Cumulative % Passing
Cumulative % Passing = [(100000 / W) * SG / (SG - SGL)] * (R -SGL) Hydrometer 151H
Cumulative % Passing = (R * a / W) * 100 Hydrometer 152H
where,
SG = Specific gravity of soil particles
SGL = Specific gravity of suspension liquid
R = Hydrometer reading with composite correction applied
a = Correction faction
Washed Sieve Cumulative % Passing
Cumulative % Passing = 100 * (Ppf - Mcw / Mtw)
where,
Mcw = Cumulative mass retained on washed sieve
Ppf = Percent passing final unwashed sieve
Mbw = Before wash sample mass
Mtw = Mbw / Ppf (if Mbw specified) or W (if hydrometer specified)
Washed Mass after Sieving
Mcwf = Final Mcw
Accuracy
Accuracy (%) = 100 * (Mcwf - Maw) / Mcwf
where,
Maw = After wash sample mass
Hydrometer Accuracy
Accuracy (%) = 100 * (Mbw / Ppf - W) / W