Civil Engineering Reference
In-Depth Information
1000
800
600
400
200
0
0
0.02
0.04
0.06
0.08
Strain, m/m
FIGURE P1.16
1.17 An asphalt concrete cylindrical specimen with a 4-inch diameter
and a 6-inch height is subjected to an axial compressive static load
of 150 lb for 1 hour after which the load is removed. The test was
performed at a temperature of 100°F. The height of the specimen
was measured at different time intervals during loading and unload-
ing for a total of 2 hours and produced the following results:
Specimen Height,
Specimen Height,
Time, minutes
inches
Time, minutes
inches
0
6.0000
60.01
5.9772
0.01
5.9916
62
5.9807
2
5.9870
65
5.9841
5
5.9833
70
5.9879
10
5.9796
80
5.9926
20
5.9753
90
5.9942
30
5.9725
100
5.9954
40
5.9708
110
5.9959
50
5.9696
120
5.9964
60
5.9688
a. Using a spreadsheet program, plot the stress versus time and the
strain versus time on two separate graphs.
b. How much is the elastic strain?
c. What is the permanent strain at the end of the experiment?
d. What is the phenomenon of the change of specimen height dur-
ing static loading called? What is the phenomenon of the change
of specimen height during unloading called?
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