Figure
20. Mohr circles for 100% natural materials ............................................................................. 17
21. Mohr circles for 25% natural materials ............................................................................... 17
22. Influence of void ratio on maximum shear stress ............................................................... 17
23. Effect of percent crushed aggregate, sample size, and void ratio on shear strength ........... 18
24. Effect of void ratio on the angle of internal friction ........................................................... 19
25. Particle index for different aggregate gradations ................................................................ 20
26. Particle index test mold ....................................................................................................... 20
27. Void volume vs. particle index at compactive effort of 10 blows per layer ........................ 21
28. Relationship between particle index and percent crushed aggregate in mixture ................ 21
29. Examples of angularities in test aggregate .......................................................................... 22
30. Percentage of round, subround, angular, and subangular aggregates in particle index test
specimen ......................................................................................................................... 22
31. Effect of percentage of crushed aggregate on particle index .............................................. 23
32. Effect of particle index on resilient modulus ...................................................................... 23
33. Angle of internal friction as a function of particle index .................................................... 24
TABLES
Table
1. Sieve size fractions .............................................................................................................. 4
2. Aggregate specific gravity and absorption .......................................................................... 4
3. Test sample proportions ...................................................................................................... 4
4. Optimum moisture densities from AASHTO T-99 and QMOT tests .................................. 6
5. Modified testing sequence for VAOT base/subbase material ............................................. 9
6. Testing sequence for VAOT base/subbase material ............................................................ 11
7. Test sample densities, moisture contents, and void ratios ................................................... 11
8. Regression coefficients k1 and k2 for (Mrθ) model ........................................................... 13
9. Test sample densities, moisture contents, and void ratios ................................................... 13
10. Average resilient modulus as a function of stress and angularity ....................................... 14
11. Regression coefficients k1 and k2 for (Mrθ) model ........................................................... 14
12. Shear strength material properties from large-scale tests ................................................... 16
13. Shear strength material properties from 150-mm sample tests ........................................... 18
14. Shear strength as a function of percent crushed aggregates, void ratio, and specimen
size .................................................................................................................................. 18
15. Average PI values for coarse and fine aggregates as a function of percent crushed aggre-
gates ................................................................................................................................ 22
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