Procedures
B
D
Graduated cylinder
Mold
Braight adiga
singan
FEE
Three equal layers
Compact each layer by
25 times
Water Content of Soil
MW
w(%) = X 100
Ms
Amount of water to add
(Msin lb)xw
Mw(in ml) = (M3 (1.00
(453.69
Moisture content of soil
Soil
S1
S2
S3
S4
Section
001
001
002
Group
A, B, C
D, E, F
A, B, C
D, E, F
Gs
2.7
2.6
2.7
2.9
w(%)
1.5
1.9
1.9
2.2
002
Lab 5. Standard Proctor Compaction Test
(Lab10 in 9th, Lab 12 in gth)
*
The degree of compaction of a soil is measured by its dry unit weight(yd).
The dry unit weight of compaction increases as the moisture content
increases until w=wopt. Beyond w=wop, any increase in moisture content
tends to reduce the dry unit weight.
* Used to determine the optimum moisture content at which a given soil type
will become most dense and achieve its maximum dry unit weight
120
116
Taty=114.2 lb/
-2.
-2.68
112
Dry unit weight, Y.(bit)
108
104
Optimum
moisture
content -12%
12 14
18
Moisture content, w (%)
Figure 10-6
Plots of ya vs. w(%) and yzay vs. w%)
For test results reported in Tables 10-1
and 10-2
100
10
Start the experiment by adding water to bring the moisture content up to
about 15% and then increase the moisture content by 2 % for each trial
The first trial
Wadded(%) = 15% - w(%)
If M. = 6 lb and w=2.7%, Wadded(%) = 12.3%
76 x 12.3 (453.6g
100 1 lb
Mw = ( x 02.3) (453.69) = 334.8G 335ml
*
From the second trial, Wadded(%) = 2%
*
Continue the test until at least two successive down readings of W2 (weight
of mold+base plate+moist soil) are obtained.
*
Lab Report (see section 10.8 in your textbook)
Results section should include data tables for compaction test and for
zero-air-void unit weight calculation, sample calculations, and the
graph for plots of yd and Yzay VS. W.
Report ya(max) and Wopt.
In discussion section, estimate Yd(max) and wope using Eqs. (10.8) and
(10.10) and compare with those obtained from the lab. Discuss any
discrepancy between the observed and estimated values. Discuss any
sources of error.
Standard Proctor Compaction Test
Determination of Dry Unit Weight
Description of soil
Sample no.
Location
5.5
Weight of hammer
lb
Volume of mold
Liquid Limit
Plasticity index
25
Number of blows/layer
Number of layers
Date
10/30/2018
Tested by
Test No.
1
2
3
4.
5
6
1. Weight of mold and base
plate, W. (lb)
2. Weight of mold and base
9.17 4.17 9179.17 9.1
plate+ moist soil, W3 (lb) 13.9313.6 13.47 13:43
14.254.51/4,3 4.26
3. Weight of mois soil.
W, - W (lb)
4. Moist unit weight
W - W
Y-
(b/n)
1/30
5. Moisture can sumber
6. Mass of moisture can.
M3 (8)
2.
5
1
63.70
3 4
23162.1962.83 62.29 /6212
7. Mass of can + moist soil, 19.1.59176.8
) 18171 133]||
8. Mass of can+dry soil.
Ms (8)
9. Moisture content,
MA - MS
w(5)
x 100
Ms - M
10. Dry unit weight of
compaction, (lb/t") =
1+ (w (5)/100)
copyright Oxford University Press
Hylsule
1073/2014
Test No.
3
6
(C.
19.17
412
9.17
Item
1
2
1. Weight of moll and base
plate. Wi (lb)
9.17 9.12
2. Weight of mold and base
plate + moist soil. Wz (lb) 13.43 (3.63 13.47
3. Weight of moist soil,
W- W (lb)
4.26 4.51 4.3
4. Moist unit weight,
W2 - W
(1b/tt1)
1/30
ya
1
2
3
4
5
163.79 62.19 62.83 62.29 |62.12
IMG_20181...
147.59 176.51 151.77
5. Moisture can number
6. Mass of moist.ire can.
My (8)
7. Mass of can + moist soil.
Mi (8)
8. Mass of can+dry soil,
Ms (g)
9. Moisture content.
Ma - Ms
Ms - Mi
10. Dry unit weight of
compaction. Yx (Ib/tr) =
1139.98 164.75 141.13 |123.67
x 100
4:35
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