Civil Engineering Reference
In-Depth Information
ρ
d
max
=
1.97 Mg/m
3
omc
=
13%
Percentage air voids
=
1.0
Answer
Exercise 14.2
A 2.5 kg rammer compaction test was carried out in a 105 mm diameter mould of
volume 1000 cm
3
and a mass of 1125 g.
Test results were:
Moisture content (%)
10.0
11.0
12.0
13.0
14.0
Mass of wet soil and mould (g)
3168
3300
3334
3350
3320
Plot the curve of dry density against moisture content and determine the test
value for
ρ
d
max
and omc.
On your diagram plot the zero and 5% air voids lines (take G
s
as 2.65). If the
percentage of gravel omitted from the test (particle specific gravity
=
2.73) was
10%, determine more correct values for
ρ
dmax
and the omc.
Answer
From test:
ρ
dmax
=
1.97 Mg/m
3
;
omc
=
12%
Corrected values:
ρ
dmax
=
2.03 Mg/m
3
;
omc
=
11%
Exercise 14.3
An MCV test carried out on a soil sample gave the following results:
No. of blows, B
Penetration (mm)
1
38.0
2
45.1
3
64.0
4
72.3
6
78.1
8
80.1
12
81.0
16
81.5
24
81.7
32
81.7
48
81.7
Determine the MCV of the soil.
Answer
MCV
=
7.5
Exercise 14.4
An MCV test carried out on a glacial till gave the results set out below:
w (%)
5.6
6.8
7.8
8.0
8.5
9.0
9.5
MCV
13.3
13.5
13.7
13.1
11.1
8.5
6.0
