Civil Engineering Reference
In-Depth Information
Fig. 14.4
Example
14.1.
Example 14.2:
Corrected
ρ
d
max
and omc for gravel content
A 2.5 kg rammer compaction test on a soil sample that had been passed through a
20 mm sieve gave a maximum dry density of 1.91 Mg/m
3
and an optimum moisture
content of 13.7%. If the percentage mass of the soil retained on the sieve was 20,
determine more correct values for
ρ
d
max
and the omc. The particle specific gravity of the
retained particles was 2.78.
Solution:
ρ
d
ρ
=
d
max
X
ρ
d
1
+
−
1
100
ρ
G
w
s
1 91
.
=
1 91
1 0 2 78
.
1 0 2
+
.
−
1
.
×
.
=
2 04
.
Mg m
/
3
100
100
−
X
w
80
100
omc
=
=
×
0 137
.
=
11
%
