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Table 4. Summary of R-Values <br />Soil Type (ASTM) <br />Soil Description <br />Assumed R-Value <br />SP & SP-SM <br />Poorly Graded Sand & Poorly Graded Sand with <br />50 <br />Silt (Sands) <br />SM <br />Silty Sand (Sandy Loam, non -plastic) <br />30 <br />SC & SC-SM <br />Clayey Sand and Silty Clayey Sand (Sandy <br />20 <br />Loam, Sandy Clay Loam,plastic) <br />CL <br />Sandy Lean Clay (Clay) <br />12 <br />CL-CH <br />Fat Clay, Lean Clay, Silty Clay (Clay) <br />10 <br />Recommended Pavement Section Thickness <br />We used the MN/DOT MNPAVE flexible pavement soft wear to calculate the pavement section <br />thicknesses. It should be noted that the pavement sections presented below are not absolutes. <br />Depending on serviceability expectations, material availability, and cost, there could be <br />circumstances under which alternative sections will be more practicable. <br />Table 5. Recommended Minimum Pavement Section Thickness <br />Assumed <br />Assumed <br />Required <br />Bituminous Pavement <br />Aggregate Base <br />Maximum ESAL's <br />R-Value <br />GE <br />(inches) <br />(inches) <br />(9-ton) <br /><50,000 <br />50 <br />10 <br />31/2 <br />6 <br /><50,000 <br />30 <br />10 <br />31/2 <br />6 <br /><50,000 <br />20 <br />11.1 <br />31/2 <br />6 <br /><50,000 <br />12 <br />16.2 <br />4 <br />8 <br /><50,000 <br />10 <br />18.2 <br />4 <br />10 <br />GE = Granular Equivalency <br />4.4 Materials <br />We recommend aggregate base meeting MN/DOT specification 3138 for Class 5 aggregate base. <br />We recommend the aggregate base be compacted to 100 percent of its maximum standard Proctor <br />dry density. <br />We recommend that the bituminous wear and base courses meet the requirements of MN/DOT <br />Specification 2360. We recommend the bituminous pavements be compacted to at least 93 % of <br />the maximum theoretical density for non -wear mix types and at least 92% of the maximum <br />theoretical density for wear mix types. <br />If the improvements will include curb and gutter repair, we recommend specifying concrete that <br />has a minimum 28-day compressive strength of 4,500 psi. We recommend specifying 5 to 8 percent <br />entrained air for exposed concrete to provide resistance to freeze -thaw deterioration. We <br />recommend slump, air content and compressive strength tests of Portland cement concrete. <br />12 <br />