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C~ <br />TABLE B -DESIGN TffiCKNESS -LIME TREATED CLAY AND <br />CEMENT-TREATED ROAD BASE <br />Maximum Wheel <br />Load (HIPS) Total Pavement <br />Thickness <br />(Inches) Lime-Treated Clay <br />(Inches) Cement-Treated <br />Road Base (Inches) <br />12 16 12 4 <br />25 20 14 6 <br />40 22 14 8 <br />Light duty pavements subject to automobi]e and light truck traffic only can be designed <br />using 6 inches of full-depth asphaltic concrete, or 6 inches of aggregate road base, preferably <br />cement or fly-ash treated to reduce permeability and increase cohesion, or 3 inches of asphaltic <br />• concrete on either 10 inches of aggregate base course or 12 inches of lime treated clay. Where <br />untreated aggregate base course is used, commercially manufactured plastic grid sheets can be <br />substituted for up to 3 inches of base, depending on the properties of the grid. Fach alternative <br />has economic and perforrance-durability tradeoffs. We can provide specifications for each of <br />the above-described materials as necessary. <br />Subfrade PreQaration: Prior to placing the pavement section, the entire subgrade should be <br />graded to the rough grade. Upon completion of rough grading, the upper 8 inches of the <br />subgtade should be scarified and compacted to 95 % of the maximum modified Proctor density <br />near optimum moisture content. <br />Drainaee: The collection and diversion of surface drainage away from paved areas is very <br />important to the satisfactory performance of the pavement because of the moisture sensitivity of <br />• 32 <br />