Cold in Place Rock Crushing and Stabilization of Northern Low ...

Berthelot, Gerbrandt, Safronetz, and Sparks. Page: 9Mean Marshall Stability (KN)302520151050Unmodified10% Clay15% Clay20% Clay10% Clay 11/m2 CaCl10% Clay 21/m2 CaCl10% Clay 31/m2 CaCl1 1/m2 CaCl2 1/m2 CaCl3 1/m2 CaCl2.5% DL10 Special4.5% DL10 Special6.5% DL10 Special2.5% SS-14.5% SS-16.5% SS-17-Day Cure7Day Cure-48 Hour SoakFIGURE 6 Marshall Stability of SDHT Highway 918-01 Stabilized SystemsFigure 7 through Figure 14 show the process used to construct the Highway 918-01 test sections. The processincludes primary in-place rock crushing with a rotomixer/stabilizer CMI650 with mandrel cutting down (Figure 7).Although the CMI R/S 650 did crush almost all in situ boulders, it provided on average a 200 mm minus crush, whichrequired raking with a motor grader to remove the larger pieces of crushed rock out of the grade to achieve effectiveshaping and compaction (Figure 8). Following the in-place rock crushing process; primary shaping and compaction ofsubgrade (Figure 9); secondary in-place rock crushing and injection of stabilizers using the CMI R/S 650 with mandrelcutting up (Figure 10); final shaping and compaction (Figures 11 and 12); and application of surface coarse traffic gravelor double seal (Figures 13 and 14) was performed.