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

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Berthelot, Gerbrandt, Safronetz, and Sparks. Page: 13FIGURE 13 Typical Gravel Wearing CoarseFIGURE 14 Typical Asphalt Emulsion Stabilized Wearing Coarse
Berthelot, Gerbrandt, Safronetz, and Sparks. Page: 144 CONSTRUCTION COST EVALUATIONThe total construction cost for each test section was equilibrated to a per kilometer basis segmented with respectto labor; equipment; gravel; stabilizer/modifier; miscellaneous costs including fuel, teeth, and housing for the crew; anddouble seal surfacing as summarized in Table 4 and illustrated in Figure 15. As seen in Table 4 and Figure 15, asignificant portion of the cost to crush boulders in-place was equipment costs. Because the CMI R/S 650 employed inthis project is designed to rotomix asphalt concrete with an unconfined compressive strength of one to five MPa at roomtemperature, boulder unconfined compressive strengths as 358 MPa inflicted severe mandrel damage when highconcentrations of boulders were encountered. During the 7.25 kilometers of rotomixed road, $13,222 of mandrel teethwas consumed. However, this pilot was intended to be a “worst case scenario” and therefore, sections of Highway 918-01 with high concentrations of boulders were selected in order to provide an extensive field evaluation of the in-placerock crushing process. It is believed that redesigned mandrel will improve efficiency, reduce teeth costs, and result infewer equipment breakdowns. Figure 16 illustrates the mean total construction cost by test section type. As seen inFigure 16, the mean construction cost per kilometer ranged from $13,684 for in-place rock crushing and a gravel wearingcoarse to $52,017 for in-place rock crushing, asphalt emulsion stabilization and a double seal wearing coarse.TABLE 4 Highway 918-01 Test Section Construction Cost Per Kilometer by Cost TypeTestSection(m)GravelCost($/Km)Stab.Cost($/Km)SealCost($/Km)Misc.Cost($/Km)TotalCost($/Km)Labor EquipTest SectionCost CostNo Stabilization 640 3,127 11,931 1,844 0 0 3,220 20,12220% Clay 500 3,104 11,407 2,185 0 0 3,022 21,29620% Clay 500 3,353 12,320 2,360 0 0 3,264 21,29615% Clay 1000 1,617 7,542 2,360 0 0 3,263 14,78215% Clay 460 3,515 16,613 2,565 0 0 3,263 25,95610%Clay-2/3l/m 2 CaCl 500 2,453 10,122 2,360 5,409 0 2,596 22,94010%Clay-1l/m 2 CaCl 200 6,133 25,304 1,475 2,823 0 2,595 38,33510%Clay-2l/m 2 CaCl 200 6,133 25,304 1,475 4,397 0 2,595 39,90510%Clay-3l/m 2 CaCl 200 4,662 20,128 1,475 5,971 0 2,595 34,8303l/m 2 CaCl 200 4,662 20,128 1,475 5,971 0 2,595 34,8302l/m 2 CaCl 200 4,662 20,128 1,475 4,397 0 2,595 33,2601l/m 2 CaCl & Seal 200 4,662 20,128 1,475 2,823 6,719 2,595 38,405No Stabilization & Seal 150 0 7,206 0 0 8,959 2,593 18,760No Stabilization 800 954 4,286 1,967 0 0 2,769 9,3522.5% DL10 Special 150 6,410 21,874 0 6,456 0 2,593 37,3336.5% DL10 Special 150 6,410 21,874 0 19,369 0 2,593 50,2474.5% DL10 & Seal 80 7,125 22,888 0 12,106 6,463 2,600 51,1812.5% SS-1 & Seal 150 7,117 22,894 0 6,706 6,467 2,593 45,7806.5% SS-1 & Seal 150 7,117 22,894 0 16,766 6,467 2,593 55,8404.5% SS-1 & Seal 160 6,672 21,464 0 10,365 6,063 10,706 55,269No Stabilization 660 1,457 4,971 1,931 0 0 2,595 10,954
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