300
0
250
0
50
0
200
75
50
25
100
75
50
150
100
75
25
0
50
100
300-mm, Sigma 3 = 36 kPa
300-mm, Sigma 3 = 71 kPa
50
150-mm, Sigma 3 = 36 kPa
150-mm, Sigma 3 = 70 kPa
0
0.300
0.050
0.000
0.100
0.150
0.200
0.250
Void Ratio
Figure 23. Effect of percent crushed aggregate, sample size, and void ratio on the maximum shear stress.
Table 14. Shear strength as a function of
Table 13. Shear strength material properties from
percent crushed aggregates, void ratio, and
150-mm sample tests.
specimen size.
Test
σ3
τ
τmax
σ3f
Void
c
(%
Void
φ
Sample
ratio
(kPa)
(kPa)
crushed
ratio
(kPa)
(kPa)
(kPa)
300-mm samples
100 (rep 1)
0.268
34
177
41
51
75% crushed - rep 1
0.155
37
175
100 (rep 2)
0.258
68
243
75% crushed - rep 2
0.158
69
248
75 (rep 1)
0.217
37
190
46
37
50% crushed - rep 1
0.190
34
104
75 (rep 2)
0.231
70
278
50% crushed - rep 2
0.147
72
186
0% crushed - rep 1
0.137
33
228
50 (rep 1)
0.219
35
217
41
68
0% crushed - rep 2
0.129
73
266
50 (rep 2)
0.231
69
281
150-mm samples
25 (rep 1)
0.267
36
191
45
42
100% crushed - rep 1
0.268
34
135
25 (rep 2)
0.221
70
276
100% crushed - rep 2
0.258
68
183
0 (rep 1)
0.180
36
165
75% crushed - rep 1
0.217
37
128
0 (rep 2)
0.187
69
312
53
29
75% crushed - rep 2
0.231
70
188
0 (rep 3)
0.182
36
186
50% crushed - rep 1
0.219
35
170
50% crushed - rep 2
0.231
69
220
25% crushed - rep 1
0.267
36
136
The effect of void ratio on the angle of internal fric-
25% crushed - rep 2
0.221
70
195
tion for the 150-mm-diameter samples is that, with
0% crushed - rep 1
0.180
36
118
increasing void ratio, the angle of internal friction
0% crushed - rep 2
0.187
69
208
decreases (Fig. 24). This is in line with results for sands