CONTENTS
Preface ......................................................................................................................................... ii
Executive summary ..................................................................................................................... v
Introduction ................................................................................................................................. 1
Test material ................................................................................................................................ 3
Moisture density .......................................................................................................................... 4
Resilient modulus and shear strength .......................................................................................... 6
Results ..................................................................................................................................... 9
Shear strength ......................................................................................................................... 15
Particle index tests ....................................................................................................................... 19
Summary and conclusions ........................................................................................................... 23
Literature cited ............................................................................................................................. 24
Appendix A: Resilient modulus results ....................................................................................... 27
Appendix B: Resilient modulus results ....................................................................................... 29
Appendix C: Particle index values .............................................................................................. 31
Abstract ........................................................................................................................................ 33
ILLUSTRATIONS
Figure
1. Grain size distribution ......................................................................................................... 1
2. Resilient modulus as measured in 400-mm- and 150-mm-diameter specimens of coarse
crushed masonry ............................................................................................................. 2
3. Influence of material type and stress state on resilient modulus ......................................... 3
4. Gradation limits meeting VAOT subbase specification ...................................................... 4
5. Gradation of subbase aggregate used in the AASHTO T-99 test ........................................ 5
6. Moisture density curves from T-99 and QMOT tests .......................................................... 5
7. QMOT test equipment for moisture density test ................................................................. 6
8. Relationship between dry densities from T-99 and QMOT for test aggregates .................. 6
9. Specimen preparation fo resilient modulus test .................................................................. 7
10. Test specimen prior to chamber placement ......................................................................... 8
11. Placement of triaxial chamber around test specimen .......................................................... 8
12. Applied stress measurement during resilient modulus test ................................................. 10
13. Corresponding strain measurement during resilient modulus test ...................................... 10
14. Resilient modulus as a function of bulk stress .................................................................... 11
15. Resilient modulus as a function of bulk stress and aggregate angularity ........................... 13
16. 150-mm-diameter test specimen at the end of testing ......................................................... 14
17. Resilient modulus as a function of bulk stress and aggregulate singularity ....................... 15
18. Effect of specimen size on resilient modulus ...................................................................... 15
19. Typical measurements ......................................................................................................... 16
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