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Using the GEdesign and the subgrade R-Value, the next step is to estimate the original design <br />ESALs for the pavement structure. Using the MnDOT GE pavement design curves (22), shown <br />in Figure 1, this value is determined. The curved portion of the GE curves in the chart are based <br />on an exponential mathematical model, given below. <br />a <br />5 <br />10 <br />�r <br />w 15 <br />7F <br />Cr <br />w <br />0 <br />20 <br />25 <br />30 <br />35 <br />40 <br />10 o 1 a� 10 5 10" 107 <br />GurnmulaUve Design Lane 18 Kip ESAL's <br />Figure]. MnDOT Bituminous Pavement Design Chart. <br />_ 1+be a f. <br />GEDesign — (c1ogESALDestgn+d) + <br />where: <br />ESALDesign = design ESALs at the time of construction, <br />a,b,c,d,f = regression coefficients, and <br />GEDesign = estimated granular equivalent used in the original design. <br />Table 5 gives the regression coefficients for the GE curves calculated in equation 4. If the <br />subgrade R-value is equal to one of the curves indicated in Table 5, the design ESALs is <br />computed and used directly. If it is between two R-values in the table, the analysis computes <br />design ESALs for the two R-values bounding the actual value at the same GEDesign, and <br />interpolates ESALDesign for the pavement structure. <br />(4) <br />loll <br />18 <br />