atterberg limit
DESCRIPTION
atterberg limitTRANSCRIPT
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1. Liquid limit test for a soil
Number of Blow (N) Moisture Content %
15 42,0
20 40,8
28 39,10
Plastic limit test with moisture content 18,7%
a. Draw the flow curve from the liquid limit test data and find the liquid limit and flow
index.
b. What is the plasticity index of the soil.
Answer:
a. Flow curve, liquid limit, and flow index
Flow curve
Liquid limit
LL = 39,75%
Flow index
= 1(%) 2(%)
2 1
= 42 40,8
20 15
38.5
39
39.5
40
40.5
41
41.5
42
42.5
0 5 10 15 20 25 30
Kad
ar A
ir %
Jumlah Pukulan (N)
Flow Curve
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= 1,2
1,301 1,176
= 1,2
0,125
= 9,6
b. Plasticity index of the soil
=
= 39,75% 18,7%
= 21,05%
2. A saturated soil with a volume 19,65 cm3 has a mass of 36 gram. When the soil was dried,
its volume and mass were 13,5 cm3 and 25 gram. Determine the shrinkage limit for the soil.
Answer:
Known:
m1 = 36 gram
m2 = 25 gram
v1 = 19,65 cm3
v2 = 13,5 cm3
w = 1gr/cm3
Asked:
Shrinkage Limit (SL)?
Solved:
= 1 2
2
1 2 2
100%
= 36 25
25
19,65 13,5 . 1
25 100%
= 11
25
6,15
25 100%
= 4,85
25 100%
= 0,194 100%
= 19,4%
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3. The sieves analysis of ten soils and the LL and PL of the fraction passing a No. 40 sieves
are:
Soil No Sieves Analysis (% finer)
LL PL No. 10 No. 40 No. 200
1 98 80 50 38 29
2 100 92 80 56 23
3 100 88 65 37 22
4 85 55 45 28 20
5 92 75 62 43 28
6 97 60 30 25 16
7 100 55 8 NP
8 94 80 63 40 21
9 83 48 20 20 15
10 100 92 86 70 38
Answer:
a. Analisis Sampel 1
Lolos ayakan No. 200 = 50% (termasuk Finer grained Soils)
Liquid Limit (LL) = 38 (< 50 )
Kerikil (gravel) = 100 98 = 2 (2%)
Pasir (sand) = 98 50 = 48 ( 48%)
Gravel < sand
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Diagram Klasifikasi
b. Analisis sampel 2
Lolos ayakan No. 200 = 80 (80%) (termasuk Finer grained Soils)
Liquid Limit (LL) = 56
Kerikil (gravel) = (0%)
Pasir (Sand) = 100 80 = 20 (20%)
Gravel < sand
Plasticity chart (CH)
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Diagram Klasifikasi
c. Analisis sampel 3
Lolos ayakan No. 200 = 65 (65%) (termasuk Finer grained Soils)
Liquid Limit (LL) = 37
Kerikil (gravel) = 100 100 = 0 (0%)
Pasir (sand) = 100 37 = 63 (63%)
Gravel < sand
Plasticity Chart (CL)
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Diagram Klasifikasi
d. Analisis sampel 4
Lolos ayakan No. 200 = 45%
Kerikil (gravel) = 100 85 = 15 %
Pasir (sand) = 85 45 = 40%
Gravel < sand
Plasticity Chart ( CL)
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Diagram Klasifikasi
e. Analisis sampel 5
Lolos ayakan No. 200 = 62 (62%) (termasuk Finer grained Soils)
Liquid Limit (LL) = 43
Kerikil (gravel) = 100 92 = 8 (8%)
Pasir (sand) = 92 62 = 30 (30%)
Gravel < sand
Plasticity Chart ( ML)
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Diagram Klasifikasi
f. Analisis sampel 6
Lolos ayakan No. 200 = 30 (30%)
Kerikil (gravel) = 100 97 = 3 (3%)
Pasir (sand) = 97 30 = 67 (67%)
Gravel < sand
Plasticy Chart (CL)
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010
20
30
40
50
60
70
80
90
100
0.0010.010.11
Diagram Klasifikasi (USCS)
g. Analisis sampel 7
Lolos ayakan nomor 200 = 8%
Kerikil (gravel ) = 0%
Pasir (sand ) = 8%
Penentuan cu dan cc :
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Cu = 30
2
1060 =
0,182
0,080,46 = 0,88
Cc = 60
10 =
0,46
0,08 = 5,75
LL dan PP tidak diketahui yang berarti gradasi buruk
Diagram Klasifikasi (USCS)
h. Analisis sampel 8
Analisis nomor 8
Lolos ayakan No. 200 = 63 (63%) (termasuk Finer grained Soils)
Liquid Limit (LL) = 40
Kerikil (gravel) = 100 94 = 6 (6%)
Pasir (sand) = 94 63 = 31 (31%)
Gravel < sand
Plasticy Chart (CL)
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Diagram Klasifikasi (USCS)
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i. Analisis sampel 9
Lolos ayakan nomor 200 = 20%
Kerikil ( Gravel ) = 100 83 = 17%
Pasir (sand) = 83 20 = 63%
Plasticity Chart (CL +ML)
Diagram Klasifikasi
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j. Analisis sampel 10
Lolos ayakan No. 200 = 86 (86%) (termasuk Finer grained Soils)
Liquid Limit (LL) = 70
Kerikil (gravel) = 100 100 = 0 (0%)
Pasir (sand) = 100 86 = 14 (14%)
Gravel < sand
Plasticity Chart
Diagram Klasifikasi (USCS)
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Tabel Penamaan Sampel
Sample No Group Symbol Group Name
1 CL-ML Sandy Silty Clay
2 CH Fat Clay With Sand
3 CL Sandy Lean Clay
4 CL or CH Clay sand with Gravel
5 ML Sandy Silt
6 SC Clayey Sand
7 SP-SM Poorly-graded sand with silt
8 CL Sandy lean Clay
9 SC-SM Silty, clayey, sand With Gravel
10 MH Elastic Silt
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tugas 5
MEKANIKA TANAH
Atterberg Limit
oleh:
Fauzi Syaiful Adam
(D621 13 320)
PROGRAM STUDI TEKNIK PERTAMBANGAN
JURUSAN GEOLOGI
FAKULTAS TEKNIK
UNIVERSITAS HASANUDDIN
GOWA
2015