Technical information

2-11
about 93% (recall that 100% compaction was achieved in the field). The test conditions
included two levels of moisture content (
ω
): 5.3% and 9.8%; three levels of applied
confining pressure: 2, 4 and 6 psi (13.8, 27.6 and 41.4 kPa); and five levels of applied
cyclic axial stress between 2 and 10 psi (13.8 to 68.9 kPa). The raw test results are
given in Table 2.3.2.
Table 2.3.2: Resilient modulus of aggregate base with average compaction level of
93%. Raw test results from laboratory reports.
Confining
Pressure, psi
(kPa)
Peak Cyclic
Stress, psi
(kPa)
Resilient
Modulus, psi
(MPa)
Peak Cyclic
Stress, psi
(kPa)
Resilient
Modulus, psi
(MPa)
ω=5.3% ω =9.8%
6.0
(41.4)
2.2 (15.2) 9,062 (62.5) 2.1 (14.5) 8,698 (60.0)
4.1 (28.3) 9,236 (63.7) 4.0 (27.6) 8,950 (61.7)
5.9 (40.7) 9,080 (62.6) 5.8 (40.0) 8,785 (60.6)
7.8 (53.8) 9,017 (62.2) 7.6 (52.4) 8,751 (60.3)
9.7 (66.9) 9,138 (63.0) 9.5 (65.5) 8,864 (61.1)
4.0
(27.6)
2.1 (14.5) 7,615 (52.5) 2.1 (14.5) 6,830 (47.1)
3.9 (26.9) 7,091 (48.9) 4.0 (27.6) 6,322 (43.6)
5.8 (40.0) 6,986 (48.2) 5.9 (40.7) 6,366 (43.9)
7.7 (53.1) 7,164 (49.4) 7.7 (53.1) 6,642 (45.8)
9.7 (66.9) 7,481 (51.6) 9.5 (65.5) 6,945 (47.9)
2.0
(13.8)
2.0 (13.8) 5,194 (35.8) 2.0 (13.8) 4,280 (29.5)
3.8 (26.2) 4,843 (33.4) 3.9 (26.9) 3,966 (27.3)
5.7 (39.3) 4,983 (34.4) 5.9 (40.7) 4,233 (29.2)
7.7 (53.1) 5,339 (36.8) 7.7 (53.1) 4,643 (32.0)
9.7 (66.9) 5,731 (39.5) 9.5 (65.5) 5,003 (34.5)
Another set of tests was done on the base material with a relative compaction
degree of 97.5% and a moisture content of 5.5%. These tests were done under applied
confining pressure levels ranging from 3 to 20 psi (20.7 to 137.9 kPa), and cyclic stress
levels in the range of 3 to 40 psi (20.7 to 275.8 kPa). Relating to equation 2.1, the
obtained coefficients were:
5677
1
=
b , 0
2
=
b and 4711.0
3
=
b .