Geology Reference
In-Depth Information
Figure 24-4
Dry Unit Weight Versus CBR [1]
[E] Design CBR for One Water Content Only
Using the data obtained from the three specimens, plot the CBR versus
molded dry unit weight relation as illustrated in Figure 24-4. Deter-
mine the design CBR at the percentage of the maximum dry unit weight
requested. [1]
[F] Design CBR for Water Content Range
Plot the data from the tests at the three compactive efforts as shown
in Figure 24-5. The data plotted as shown represent the response of
the soil over the range of water content specified. Select the CBR for
reporting as the lowest CBR within the specified water content range
having a dry unit weight between the specified minimum and the dry
unit weight produced by compaction within the water content range. [1]
A CBR test was performed according to the procedure described. The
CBR was desired at 100% maximum dry unit weight and optimum mois-
ture content. The following data were obtained:
NUMERICAL
EXAMPLE
[A] Water Content Determination
Average
Top 1-in.
Moisture
Before
After
Layer after
Content after
Compaction
Compaction
Soaking
Soaking
Can no.
1-A
1-B
1-C
1-D
Mass of wet soil can (g)
315.94
326.01
304.71
356.37
Mass of dry soil can (g)
273.69
283.37
261.53
305.82
Mass of can (g)
45.23
47.82
43.44
46.59
 
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