Mr.Sirichai Srikwamcharoen( ศิ�ริ�ชั�ย ศิริ�ความเจริ�ญ)ID : 5322771312
Homeworks#11.1
US Siev
e No.
Mass of soil
retained on each
sieve (g)
Percent
retainedon
eachsieve (%)
Cumulative
percentretained on each
sieve (%)
Percent
finer (%)
4 0 0 0 10010 21.6 4.8 4.8 95.220 49.5 11 15.8 84.240 102.6 22.8 38.6 61.460 89.1 19.8 58.4 41.6100 95.6 21.24 79.64 20.3
6200 60.4 13.42 93.06 6.94Pan 31.2 6.93 99.99 0.01
450
Percent of soil retained = Mass of soil retainedTotal massof soil × 100
Percent finer = 100 – Percent of soil retained
U.S Sieve Series and Tyler Equivalents
http://www.buyactivatedcharcoal.com/sieve_size_chart
D10 = 0.09
D30 = 0.2
D60 = 0.41
Calculate the uniformity coefficient ( Cu )
Cu = D60D10 = 0.41mm0.09mm
= 4.6
Calculate the coefficient of gradation ( C c¿
C c = (D30×D30)(D10×D60)
= 0.2mm×0.2mm0.09mm×0.41mm
= 0.04mm2
0.0369mm2 = 1.08